When to change to winter tyres in Chur
Development preview: the climate figures on this page come from a synthetic sample dataset, not real measurements. The page is hidden from search engines until real data is in place.
In Chur the 7 °C line is usually crossed around 28 October, which puts the typical tyre change in the second half of October or early November.
Typical best window
21 October – 28 October
For an experienced driver on city roads, from climate averages. Novice drivers: 13 October – 20 October.
- Average 7 °C rule date
- 28 October
- Average first frost
- 23 November
- Frost days in November (average)
- 3
November brings on average 3 frost days, with the first frost typically around 23 November.
The date varies a lot from year to year: over the last 10 autumns the 7 °C rule triggered as early as 16 October and as late as 7 November. Check the live forecast each year rather than relying on a fixed date.
Backtest: in 10 of the last 10 autumns, changing within this typical window would have put winter tyres on before the first slippery day (frost on a wet road or snow).
7 °C rule date in recent seasons
| Season | 7 °C rule | First frost | Frost days in Nov. |
|---|---|---|---|
| 2016/17 | 29 Oct | 10 Nov | 3 |
| 2017/18 | 22 Oct | 25 Nov | 2 |
| 2018/19 | 4 Nov | 22 Nov | 6 |
| 2019/20 | 7 Nov | 30 Nov | 1 |
| 2020/21 | 18 Oct | 18 Nov | 5 |
| 2021/22 | 31 Oct | 15 Nov | 4 |
| 2022/23 | 5 Nov | 19 Nov | 2 |
| 2023/24 | 19 Oct | 30 Nov | 1 |
| 2024/25 | 16 Oct | 30 Nov | 1 |
| 2025/26 | 4 Nov | 27 Nov | 4 |
Source: SAMPLE — synthetic placeholder, NOT real data. Replace with Copernicus ERA5 via `pnpm climate:build`.. Grid cell 47.00,10.00.
When to change to summer tyres in Chur
Typical best window for summer tyres
1 April – 8 April
For an experienced driver on city roads, from climate averages. Novice drivers: 12 April – 19 April.
- Average warm-up (7 °C rule)
- 1 April
- Average last frost
- 16 March
- Average last slippery day
- 12 March
In Chur the 5-day average usually stays above 7 °C from around 1 April. The last frost comes on average around 16 March, and the last slippery day (frost on a wet road or snow) around 12 March.
Backtest: in 10 of the last 10 springs there was no slippery day after the start of this typical window. In the other years a cold morning still came later — check the forecast before you change; the live calculator does that for you.
| Spring | Above 7 °C from | Last frost | Last slippery day |
|---|---|---|---|
| 2017 | 5 Apr | 27 Mar | 27 Mar |
| 2018 | 4 Apr | 11 Mar | 26 Feb |
| 2019 | 30 Mar | 19 Mar | 19 Mar |
| 2020 | 15 Apr | 19 Mar | 19 Mar |
| 2021 | 1 Apr | 9 Mar | 9 Mar |
| 2022 | 29 Mar | 14 Mar | 14 Mar |
| 2023 | 31 Mar | 18 Mar | 17 Mar |
| 2024 | 11 Apr | 31 Mar | 20 Mar |
| 2025 | 15 Mar | 10 Mar | 10 Mar |
| 2026 | 24 Mar | 27 Feb | 17 Feb |
Get your personal dates for Chur
The live calculator adds the 10-day forecast and your driving profile to these averages.
Winter tyre rules in Switzerland
No legal winter tyre requirement. Winter tyres are only recommended. Switzerland has no general legal obligation to use winter tyres, but vehicles must be fit for the conditions: drivers who obstruct traffic or cause an accident on summer tyres in wintry conditions can be fined.