Radenci, Slovenia · 42.195 km road marathon
Three Hearts Marathon 2027 training plan
Race day Saturday 15 May 2027 · 32 full weeks away
16-week plan: Mon 25 Jan 2027 → race Sat 15 May 2027
Starts in 16 weeks. What to do until then
Assumes a runner now at: 35 km a week, longest recent run 18 km, 4 run days, a first marathon. Not you? Change it
Opens at 35 km a week and builds to 56.1 km; the long run grows to 27 km. Every few weeks is an easier one, and the last weeks taper.
A typical week: week 9, from Mon 22 Mar
- TueRace-effort practice: steady segments · 9.7 km
- ThuEasy run · 10.5 km
- SatLong run · 21.8 km
- SunRecovery run or hike · 6.5 km
Other days rest.
Keep it, print it or add it to your calendar — no account needed.
Your goal
Same starting point for each; change it under “Adjust this plan”.Your 16-week finish well plan
The plan starts Monday 25 January 2027, 16 weeks from now. Until then: base weeks from this week or a half marathon on the way.
Which one?
Base weeks: mostly easy running at the volume you run now, then this plan, in one calendar with a "what do I do today". Same runner, same plan. If you follow the Evergreen plan, these base weeks are that plan.
A half marathon four to six weeks before the marathon is the classic build-up: a fitness check and race practice that sets your marathon pace. The list shows halves three to eight weeks out; pick one and the season planner fits it into this build.
Or keep this page: it shows the same plan until Monday 25 January 2027.
Tap or point at a week to see it.
Week 1 · from Mon 25 Jan
Build consistent easy running — 35 km; long run 16 km
- Mon 25 JanRest
- Tue 26 JanEasy run + strides
- Thu 28 JanEasy run
- Sat 30 JanLong run
- Sun 31 JanRecovery run or hike
No account needed. A kept plan stays on this browser until its storage is cleared; find it under My kept plans, where you can also change single weeks.
Calendar
Choose a subscription that refreshes, or download a one-time copy.
Adjust this planDefault starting point: 35 km/week; longest recent outing 18 km; 4 days/week; steady recent training; first marathon.
All 16 weeks
Use it for race-effort sessions and race day. Easy runs stay easy whatever the goal; the plan's efforts come from how you run now.
Plan assumptions and limits
- Road race: the plan is distance-driven and no vertical target is prescribed.
- Generic planning guidance from race facts and stated training — not medical care or individual coaching.
- Training distances and durations are approximate alternatives, not pace targets. Use current effort, not a hoped-for finish time. Repeat or shorten a week if recovery is poor; do not make up missed sessions.
Week 1: Build consistent easy running35 km; long run 16 km
- Rest
Rest or gentle mobility.
- Easy run + strides
35 min (about 5.6 km). Start with 10 minutes easy. Then 6 x 20 seconds relaxed strides, with 1 minute easy between repeats. Finish with at least 10 minutes easy; any remaining time is easy.
- Easy run
60 min (about 9.5 km). Conversational aerobic running. Keep easy days easy enough to support the key work.
- Long run
100 min (about 15.9 km). Build relaxed time on feet at conversational effort. Practise eating and drinking on longer easy runs; easy pace is not a reason to skip fueling. For runs lasting 1 to 2.5 hours, 30 to 60 g of carbohydrate per hour is a useful starting range; beyond 2.5 hours, build toward 60 to 90 g per hour if you have practised it and tolerate it. Adjust fluid to your needs and the conditions.
- Recovery run or hike
25 min (about 4 km). Keep this genuinely easy, or substitute an easy hike.
Week 2: Build consistent easy running37 km; long run 16 km
- Rest
Rest or gentle mobility.
- Easy run + strides
40 min (about 6.4 km). Start with 10 minutes easy. Then 6 x 20 seconds relaxed strides, with 1 minute easy between repeats. Finish with at least 10 minutes easy; any remaining time is easy.
- Easy run
65 min (about 10.5 km). Conversational aerobic running. Keep easy days easy enough to support the key work.
- Long run
100 min (about 16.1 km). Build relaxed time on feet at conversational effort. Practise eating and drinking on longer easy runs; easy pace is not a reason to skip fueling. For runs lasting 1 to 2.5 hours, 30 to 60 g of carbohydrate per hour is a useful starting range; beyond 2.5 hours, build toward 60 to 90 g per hour if you have practised it and tolerate it. Adjust fluid to your needs and the conditions.
- Recovery run or hike
25 min (about 4 km). Keep this genuinely easy, or substitute an easy hike.
Week 3: Build consistent easy running39 km; long run 15.5 km
- Rest
Rest or gentle mobility.
- Easy run + strides
40 min (about 6.5 km). Start with 10 minutes easy. Then 6 x 20 seconds relaxed strides, with 1 minute easy between repeats. Finish with at least 10 minutes easy; any remaining time is easy.
- Easy run
70 min (about 11.4 km). Conversational aerobic running. Keep easy days easy enough to support the key work.
- Long run
95 min (about 15.4 km). Build relaxed time on feet at conversational effort. Practise eating and drinking on longer easy runs; easy pace is not a reason to skip fueling. For runs lasting 1 to 2.5 hours, 30 to 60 g of carbohydrate per hour is a useful starting range; beyond 2.5 hours, build toward 60 to 90 g per hour if you have practised it and tolerate it. Adjust fluid to your needs and the conditions.
- Recovery run or hike
35 min (about 5.7 km). Keep this genuinely easy, or substitute an easy hike.
Week 4: Absorb the work: reduce volume, keep frequency gentle31 km; long run 12 km
- Rest
Rest or gentle mobility.
- Easy run + relaxed strides
35 min (about 5.6 km). Start with 10 minutes easy. Then 6 x 20 seconds relaxed strides, with 1 minute easy between repeats. Finish with at least 10 minutes easy; any remaining time is easy.
- Easy run
60 min (about 9.5 km). Conversational aerobic running. Keep easy days easy enough to support the key work.
- Long run
75 min (about 11.9 km). Build relaxed time on feet at conversational effort. Practise the fuel, hydration and kit you intend to use; treat amounts as rehearsal, not a universal prescription.
- Recovery run or hike
25 min (about 4 km). Keep this genuinely easy, or substitute an easy hike.
Week 5: Build consistent easy running40.2 km; long run 16 km
- Rest
Rest or gentle mobility.
- Easy run + strides
40 min (about 6.4 km). Start with 10 minutes easy. Then 6 x 20 seconds relaxed strides, with 1 minute easy between repeats. Finish with at least 10 minutes easy; any remaining time is easy.
- Easy run
75 min (about 12.1 km). Conversational aerobic running. Keep easy days easy enough to support the key work.
- Long run
100 min (about 16.1 km). Build relaxed time on feet at conversational effort. Practise eating and drinking on longer easy runs; easy pace is not a reason to skip fueling. For runs lasting 1 to 2.5 hours, 30 to 60 g of carbohydrate per hour is a useful starting range; beyond 2.5 hours, build toward 60 to 90 g per hour if you have practised it and tolerate it. Adjust fluid to your needs and the conditions.
- Recovery run or hike
35 min (about 5.6 km). Keep this genuinely easy, or substitute an easy hike.
Week 6: Build consistent easy running44 km; long run 18.5 km
- Rest
Rest or gentle mobility.
- Easy run + strides
40 min (about 6.4 km). Start with 10 minutes easy. Then 6 x 20 seconds relaxed strides, with 1 minute easy between repeats. Finish with at least 10 minutes easy; any remaining time is easy.
- Easy run
80 min (about 12.8 km). Conversational aerobic running. Keep easy days easy enough to support the key work.
- Long run
115 min (about 18.4 km). Build relaxed time on feet at conversational effort. Practise eating and drinking on longer easy runs; easy pace is not a reason to skip fueling. For runs lasting 1 to 2.5 hours, 30 to 60 g of carbohydrate per hour is a useful starting range; beyond 2.5 hours, build toward 60 to 90 g per hour if you have practised it and tolerate it. Adjust fluid to your needs and the conditions.
- Recovery run or hike
40 min (about 6.4 km). Keep this genuinely easy, or substitute an easy hike.
Week 7: Grow the long run; keep the other runs easy46.1 km; long run 20 km
- Rest
Rest or gentle mobility.
- Race-effort practice: steady segments
55 min (about 8.9 km). Start with 10 minutes easy. Then 3 x 6 minutes at a steady effort, about what you expect to hold on race day, with 3 minutes easy between. Finish with at least 10 minutes easy.
- Easy run
65 min (about 10.5 km). Conversational aerobic running. Keep easy days easy enough to support the key work.
- Long run
125 min (about 20.2 km). Build relaxed time on feet at conversational effort. Practise eating and drinking on longer easy runs; easy pace is not a reason to skip fueling. For runs lasting 1 to 2.5 hours, 30 to 60 g of carbohydrate per hour is a useful starting range; beyond 2.5 hours, build toward 60 to 90 g per hour if you have practised it and tolerate it. Adjust fluid to your needs and the conditions.
- Recovery run or hike
40 min (about 6.5 km). Keep this genuinely easy, or substitute an easy hike.
Week 8: Absorb the work: reduce volume, keep frequency gentle37 km; long run 16 km
- Rest
Rest or gentle mobility.
- Easy run + relaxed strides
35 min (about 5.6 km). Start with 10 minutes easy. Then 6 x 20 seconds relaxed strides, with 1 minute easy between repeats. Finish with at least 10 minutes easy; any remaining time is easy.
- Easy run
65 min (about 10.5 km). Conversational aerobic running. Keep easy days easy enough to support the key work.
- Long run
100 min (about 16.1 km). Build relaxed time on feet at conversational effort. Practise eating and drinking on longer easy runs; easy pace is not a reason to skip fueling. For runs lasting 1 to 2.5 hours, 30 to 60 g of carbohydrate per hour is a useful starting range; beyond 2.5 hours, build toward 60 to 90 g per hour if you have practised it and tolerate it. Adjust fluid to your needs and the conditions.
- Recovery run or hike
30 min (about 4.8 km). Keep this genuinely easy, or substitute an easy hike.
Week 9: Grow the long run; keep the other runs easy48.5 km; long run 22 km
- Rest
Rest or gentle mobility.
- Race-effort practice: steady segments
60 min (about 9.7 km). Start with 10 minutes easy. Then 3 x 8 minutes at a steady effort, about what you expect to hold on race day, with 3 minutes easy between. Finish with at least 10 minutes easy.
- Easy run
65 min (about 10.5 km). Conversational aerobic running. Keep easy days easy enough to support the key work.
- Long run
135 min (about 21.8 km). Build relaxed time on feet at conversational effort. Practise eating and drinking on longer easy runs; easy pace is not a reason to skip fueling. For runs lasting 1 to 2.5 hours, 30 to 60 g of carbohydrate per hour is a useful starting range; beyond 2.5 hours, build toward 60 to 90 g per hour if you have practised it and tolerate it. Adjust fluid to your needs and the conditions.
- Recovery run or hike
40 min (about 6.5 km). Keep this genuinely easy, or substitute an easy hike.
Week 10: Grow the long run; keep the other runs easy51 km; long run 23.5 km
- Rest
Rest or gentle mobility.
- Race-effort practice: steady segments
60 min (about 9.7 km). Start with 10 minutes easy. Then 3 x 10 minutes at a steady effort, about what you expect to hold on race day, with 3 minutes easy between. Finish with at least 10 minutes easy.
- Easy run
65 min (about 10.5 km). Conversational aerobic running. Keep easy days easy enough to support the key work.
- Long run
145 min (about 23.5 km). Build relaxed time on feet at conversational effort. Practise eating and drinking on longer easy runs; easy pace is not a reason to skip fueling. For runs lasting 1 to 2.5 hours, 30 to 60 g of carbohydrate per hour is a useful starting range; beyond 2.5 hours, build toward 60 to 90 g per hour if you have practised it and tolerate it. Adjust fluid to your needs and the conditions.
- Recovery run or hike
45 min (about 7.3 km). Keep this genuinely easy, or substitute an easy hike.
Week 11: Your longest runs, still at an easy effort52.9 km; long run 25 km
- Rest
Rest or gentle mobility.
- Race-effort practice: steady segments
65 min (about 10.4 km). Start with 10 minutes easy. Then 3 x 10 minutes at a steady effort, about what you expect to hold on race day, with 3 minutes easy between. Finish with at least 10 minutes easy.
- Easy run
65 min (about 10.4 km). Conversational aerobic running. Keep easy days easy enough to support the key work.
- Long run
155 min (about 24.9 km). Use race-like terrain where practical, but keep the overall effort controlled. Practise eating and drinking on longer easy runs; easy pace is not a reason to skip fueling. For runs lasting 1 to 2.5 hours, 30 to 60 g of carbohydrate per hour is a useful starting range; beyond 2.5 hours, build toward 60 to 90 g per hour if you have practised it and tolerate it. Adjust fluid to your needs and the conditions.
- Recovery run or hike
45 min (about 7.2 km). Keep this genuinely easy, or substitute an easy hike.
Week 12: Absorb the work: reduce volume, keep frequency gentle41.9 km; long run 20 km
- Rest
Rest or gentle mobility.
- Easy run + relaxed strides
45 min (about 7.1 km). Start with 10 minutes easy. Then 6 x 20 seconds relaxed strides, with 1 minute easy between repeats. Finish with at least 10 minutes easy; any remaining time is easy.
- Easy run
60 min (about 9.5 km). Conversational aerobic running. Keep easy days easy enough to support the key work.
- Long run
125 min (about 19.8 km). Use race-like terrain where practical, but keep the overall effort controlled. Practise eating and drinking on longer easy runs; easy pace is not a reason to skip fueling. For runs lasting 1 to 2.5 hours, 30 to 60 g of carbohydrate per hour is a useful starting range; beyond 2.5 hours, build toward 60 to 90 g per hour if you have practised it and tolerate it. Adjust fluid to your needs and the conditions.
- Recovery run or hike
35 min (about 5.5 km). Keep this genuinely easy, or substitute an easy hike.
Week 13: Your longest runs, still at an easy effort56.1 km; long run 27 km
- Rest
Rest or gentle mobility.
- Race-effort practice: steady segments
65 min (about 10.6 km). Start with 10 minutes easy. Then 2 x 12 minutes at a steady effort, about what you expect to hold on race day, with 3 minutes easy between. Finish with at least 10 minutes easy.
- Easy run
70 min (about 11.4 km). Conversational aerobic running. Keep easy days easy enough to support the key work.
- Long run
165 min (about 26.8 km). Use race-like terrain where practical, but keep the overall effort controlled. Practise your race-day carbohydrate plan on this long run: 30 to 90 g per hour according to expected marathon duration, pace and stomach tolerance. Build toward the higher end only if you have practised it. Count the carbohydrate grams in your gels, drinks and other food rather than following a fixed gel interval. Practise drinking for your needs and the conditions; avoid overdrinking.
- Recovery run or hike
45 min (about 7.3 km). Keep this genuinely easy, or substitute an easy hike.
Week 14: Reduce fatigue while retaining a small intensity reminder40.1 km; long run 17.5 km
- Rest
Rest or gentle mobility.
- Short race-effort reminder
40 min (about 6.3 km). Start with 10 minutes easy. Then 4 x 2 minutes at controlled race effort, with 1 minute easy between repeats. Finish with at least 10 minutes easy; any remaining time is easy.
- Easy run
70 min (about 11 km). Conversational aerobic running. Keep easy days easy enough to support the key work.
- Long run
110 min (about 17.3 km). Keep this comfortable and finish with plenty in reserve. Practise eating and drinking on longer easy runs; easy pace is not a reason to skip fueling. For runs lasting 1 to 2.5 hours, 30 to 60 g of carbohydrate per hour is a useful starting range; beyond 2.5 hours, build toward 60 to 90 g per hour if you have practised it and tolerate it. Adjust fluid to your needs and the conditions.
- Recovery run or hike
35 min (about 5.5 km). Keep this genuinely easy, or substitute an easy hike.
Week 15: Reduce fatigue while retaining a small intensity reminder30.2 km; long run 10.5 km
- Rest
Rest or gentle mobility.
- Short race-effort reminder
30 min (about 4.8 km). Start with 10 minutes easy. Then 3 x 2 minutes at controlled race effort, with 1 minute easy between repeats. Finish with at least 10 minutes easy; any remaining time is easy.
- Easy run
65 min (about 10.3 km). Conversational aerobic running. Keep easy days easy enough to support the key work.
- Long run
65 min (about 10.3 km). Keep this comfortable and finish with plenty in reserve. Practise the fuel, hydration and kit you intend to use; treat amounts as rehearsal, not a universal prescription.
- Recovery run or hike
30 min (about 4.8 km). Keep this genuinely easy, or substitute an easy hike.
Week 16: Arrive rested; avoid last-minute fitness work14.9 km before the race
- Easy run
35 min (about 5.8 km). Keep this short and conversational. The goal is freshness, not fitness.
- Easy pre-race run
35 min (about 5.8 km). Run conversationally. If already familiar, include a few relaxed strides with full recovery; otherwise stay easy.
- Optional shakeout
20 min (about 3.3 km). Rest, or jog very easily if that reliably helps you feel better.
- Race day
Run the 42.2 km as planned: start controlled and use the fuelling and kit rehearsed in training. Afterwards: rest or walk for two or three days, then short easy runs only, with no hard running for about two weeks.
- Post-race recovery
Prioritize rest, food, fluids and gentle movement; do not schedule a workout by default.
Other spring 2027 marathons and their plan start dates
Sources and what is still provisional
Race facts checked 2026-09-24; review due 2026-11-06. The schedule was generated on 2026-10-02 from the confirmed date and distance; it is TrailSplits' own calculation and is not endorsed by the organizer. Independently prepared by TrailSplits.
- 2027 edition page
The 45th edition on 15 May 2027 at Radenci (Hotel Radin) with a 09:00 start, the distances, aid stations every 2.5 km, four toilet points on the marathon, the wardrobe beside the bib tent and showers at the start and finish. The English page at /en/about-marathon gives the same date as May 15, 2027.
- Marathon course page
The 42.195 m distance, the 09:00 start, the 2 h 30 limit for entering the marathon loop at km 19, the 198 m start height, 122 m of climbing, the flat course and AIMS measurement, the course map (MaratonTrehSrc42Km.kml, version 2025.03) behind the map line, and the older two-lap description. The half-marathon page places the start in front of Hotel Radin.
- 2026 rules (razpis)
The 2026 fee bands and deadlines, group price, refund fees, the chip in the fee, the parental statement for under-16s and the 2 h 30 rule at Petanjci; the English version at /en/tender adds that late runners are sent to the 21 km finish and recorded as DNF. 2026 facts, not 2027 confirmations.
- 2026 bib pickup notice
Pickup at Hervis BTC Ljubljana on 13 May, Hervis Europark Maribor on 14 May, and Hotel Izvir in Radenci on 15 May 13:00 to 19:00 and 16 May 07:00 to 08:30, with ChampionChip timing. The notice at /aktualno/prijave-na-44-maraton-treh-src-tudi-v-soboto confirms race-day entry at the venue in 2026.
- 2026 relay and travel notices
Relay runners joining at km 21 in Tišina and at km 32 between Rankovci and Gederovci in 2026 (the 2025 notice gives the same points), which fit the current course map; the notice at /aktualno/pravocasno-na-start-44-maratona-treh-src times car journeys to arrive by 07:30.