Alte Konstanzerstrasse
MODERATE (2/10)Sonnenhalde → Oberloch
Use this route
The walk, as far as the open data goes
Getting there
- Start: parking car park, 52 m away
- Start: Cityparking Brühltor (44) car park, 171 m away
- Start: Schützengarten bus stop, 183 m away
- Finish: Sonnental bus stop, 240 m away
Somewhere to stop
- BrüW pub
Mapped within 200 m of the line. Whether they are open is not something we have read.
Height and time
- High point 807 m
- Low point 483 m
- Climb 482 m from a 30 m terrain model, smoothed
- Swiss signpost time 4 h 06 the official method, on our line
Computed on 2026-09-20 from OpenStreetMap, the terrain model and the federal route layer — not read from the operator's own page, and not checked on the ground. Hikes we have reviewed say who published each fact and when.
Explore the route
Read the topography, inspect the climb, or preview the route over real terrain.
Route briefing
What comes next
Climbs, descents and decisive places in route order. Not listed does not mean absent: it may not be mapped.
Start
0 m
Sonnenhalde
Start
Route geometry · source 2026-04-11
About 0 min in
12.2 km remaining
+482 m remaining
Route note
0 m
Rotzenwil
Hamlet
OpenStreetMap · source 2026-04-11
About 0 min in
12.2 km remaining
+482 m remaining
Route note
500 m
Grüenholz
Hamlet
OpenStreetMap · source 2026-04-11
About 10 min in
11.7 km remaining
+461 m remaining
Climb
7.4 km
209 m climb
1.8 km at 11.4% average
OpenStreetMap route data · source 2026-04-11
About 2h 29m in
4.8 km remaining
+319 m remaining
Descent
9.3 km
137 m descent
2.4 km at 5.8% average
OpenStreetMap route data · source 2026-04-11
About 3h 06m in
2.9 km remaining
+116 m remaining
Climb
11.7 km
104 m climb
0.6 km at 18.5% average
OpenStreetMap route data · source 2026-04-11
About 3h 53m in
570 m remaining
+106 m remaining
Finish
12.2 km
Oberloch
Finish
Route geometry · source 2026-04-11
About 4h 04m in
0 m remaining
Trail route lab
Turn this trail into your own route
Open a planning copy, adjust the line, then share the version you would actually run or hike.
Alte Konstanzerstrasse is a 12.2 km point-to-point moderate hiking route in Switzerland, running from Sonnenhalde to Oberloch. The route covers 482m of ascent and 211m of descent, with elevations ranging from 482m to 804m. Allow approximately 4h 04m for the full route.
With 93% of the route below 15% gradient, strong trail runners can maintain a good rhythm for much of the distance. Some pitches hit 46% gradient, so trekking poles are strongly recommended.
Budget roughly 1,995 kcal of energy expenditure and 2.4 L of water.
Low-altitude route (max 804m). Hikeable most of the year.
Segment Breakdown
Auto-analyzed from the elevation profile. Each segment shows the dominant character for planning your effort.
| Segment | Dist | ↑ / ↓ | Time | Character |
|---|---|---|---|---|
Sonnenhalde → km 9.3 (804m) 483–804m | 9.3 km | +376m / -55m | 3h 03m | 📈 Climbing |
km 9.3 (804m) → Oberloch 665–804m | 2.9 km | +108m / -141m | 1h 01m | 🥾 Rolling Terrain |
| Total | 12.2 km | +482m / -211m | 4h 04m |
Pace & Fuel Calculator
Adjust your flat 10K pace to see personalized finish time, calorie burn, and hydration needs.
Terrain Analysis
Surface & Technicality
Gradient describes steepness, not exposure, scrambling, footing or current conditions. Technical difficulty is unknown where no mapped rating is available.
Tree cover and UV
🌲 Largely under trees. Good canopy at lower elevations, so the open sections are the ones to plan for.
Canopy is inferred from elevation against a 2000 m Alpine treeline and from gradient below it, not from observed tree data — treat it as an estimate. It is a different question from the terrain shade above, which is about whether a mountain is between you and the sun at a given time.
Current Conditions
Based on 1991–2020 climate averages, the weather on Alte Konstanzerstrasse is usually best from April to October.
Weather this week
Loading the forecast for low point (483 m) and high point (807 m)…
Weather by month
Typical weather on this trail: at the lowest point (483 m) and the highest point (807 m). Select a month to see why it is rated as it is.
| Month | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Weather | Mixed | Mixed | Mixed | Good | Good | Good | Good | Good | Good | Good | Mixed | Mixed |
| High point, day / night | 3°/-2° | 4°/-2° | 9°/1° | 13°/4° | 17°/8° | 20°/11° | 22°/13° | 22°/13° | 17°/9° | 12°/6° | 7°/2° | 4°/-1° |
| Low point, day / night | 4°/-1° | 6°/-1° | 11°/2° | 15°/5° | 20°/9° | 23°/13° | 25°/14° | 24°/14° | 19°/11° | 14°/7° | 8°/3° | 5°/0° |
| Rain, mm | 62 | 63 | 76 | 86 | 138 | 140 | 146 | 149 | 118 | 89 | 89 | 80 |
| Snow at high point | Possible | Possible | Possible | – | – | – | – | – | – | – | Frost | Possible |
| Daylight | 8 h 51 | 10 h 14 | 11 h 49 | 13 h 34 | 15 h 04 | 15 h 56 | 15 h 37 | 14 h 20 | 12 h 39 | 10 h 58 | 9 h 22 | 8 h 29 |
Source: TerraClimate 1991–2020 monthly averages. Averages for the area at each point’s elevation (4 km grid, corrected for height). Not a forecast or a report of current trail conditions. These values describe the whole trail's lowest and highest points. Snow at the high point is estimated with a simple snowpack model from these temperatures and precipitation, not observed; steep islands and high summits can hold more snow than it shows. Daylight is for the 15th of each month. Hut, transport and park seasons are separate: check them for your dates.
Averages cannot establish current trail conditions. Check recent local reports, the forecast and restrictions before departure. Snow and ice can persist on shaded sections or arrive outside the usual season.
Current snow conditions
Insufficient evidence
Enable “Current snow map” in the route map’s Map layers to see the surrounding snow evidence. Current conditions do not describe a future departure date.
Planning ahead?
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Safety & Bailouts
We do not have a verified emergency exit plan for this route. A nearby settlement, hut or route endpoint is not necessarily reachable or open. Do not leave the trail based on a straight-line distance or compass direction.
Review possible exits against current local information before your trip. In an emergency, contact local rescue services; this page is not live rescue guidance.
Suggested Gear List
Auto-generated based on 12.2 km, 482m ascent, max altitude 804m, ~4h duration.
- 👟 Trail running shoes / hiking bootsRequired for any trail
- 📱 Phone (charged) + offline mapNavigation & emergency contact
- 💧 2L hydration packWater source information is incomplete; plan supplies before departure
- 🍫 Trail mix, bars & sandwichEst. 1995 kcal burn
- 🧴 SunscreenBasic sun protection
- 🧥 Light rain jacketWeather changes fast in the mountains
- 🩹 Mini first aid kitBlister plasters, tape, antiseptic
- 🧊 Microspikes / light cramponsSnow risk in Jan, Feb, Mar
- 🦵 GaitersKeep snow out of boots
Logistics
This route runs from Sonnenhalde to Oberloch (12.2 km by trail). You'll need to arrange transport back to your starting point.
Nearby Points of Interest
📍 Nearby Places
- Sonnenbüel km 0.7 · 690m off trail
- Chatzensteig km 0.7 · 928m off trail
- Chesswil km 1.5 · 1.4 km off trail
- Karlshusen km 1.7 · 1.5 km off trail
- Bueholz km 1.5 · 1.6 km off trail
Route Details
- Network
- Regional Trail Network
- Sport
- hiking
- Start
- Sonnenhalde
- End
- Oberloch
- Start Coordinates
- 47.52182, 9.31289
- OpenStreetMap
- View on OSM →
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Route resources
Specialist links and source details for this route. Everyday actions are kept in the route rail above.