When to change to winter tyres in Trieste
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.
Trieste stays mild for longer: the 5-day average usually only drops below 7 °C around 23 November, so most drivers can wait until November.
Typical best window
15 November – 22 November
For an experienced driver on city roads, from climate averages. Novice drivers: 5 November – 12 November.
- Average 7 °C rule date
- 23 November
- Average first frost
- 27 December
- Frost days in November (average)
- 0
Frost is rare in November (about 0 days on average), so the 7 °C rule — not frost — usually decides the date.
The date varies a lot from year to year: over the last 10 autumns the 7 °C rule triggered as early as 13 November and as late as 4 December. 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 | 22 Nov | 20 Dec | 0 |
| 2017/18 | 25 Nov | 23 Dec | 0 |
| 2018/19 | 13 Nov | 19 Dec | 0 |
| 2019/20 | 20 Nov | 8 Jan | 0 |
| 2020/21 | 28 Nov | 21 Jan | 0 |
| 2021/22 | 13 Nov | 20 Dec | 0 |
| 2022/23 | 27 Nov | 8 Jan | 0 |
| 2023/24 | 4 Dec | 9 Jan | 0 |
| 2024/25 | 17 Nov | 5 Dec | 0 |
| 2025/26 | 26 Nov | 10 Dec | 0 |
Source: SAMPLE — synthetic placeholder, NOT real data. Replace with Copernicus ERA5 via `pnpm climate:build`.. Grid cell 46.00,14.00.
When to change to summer tyres in Trieste
Typical best window for summer tyres
10 March – 17 March
For an experienced driver on city roads, from climate averages. Novice drivers: 22 March – 29 March.
- Average warm-up (7 °C rule)
- 8 March
- Average last frost
- 16 February
- Average last slippery day
- 16 February
In Trieste the 5-day average usually stays above 7 °C from around 8 March. The last frost comes on average around 16 February, and the last slippery day (frost on a wet road or snow) around 16 February.
Backtest: in 9 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 | 17 Mar | 27 Feb | 27 Feb |
| 2018 | 9 Feb | 3 Feb | 3 Feb |
| 2019 | 23 Mar | 14 Mar | 14 Mar |
| 2020 | 4 Mar | — | — |
| 2021 | 12 Mar | 3 Feb | 3 Feb |
| 2022 | 8 Mar | 10 Feb | 7 Feb |
| 2023 | 2 Mar | — | — |
| 2024 | 13 Mar | 13 Feb | 12 Feb |
| 2025 | 1 Mar | — | — |
| 2026 | 18 Mar | — | — |
Get your personal dates for Trieste
The live calculator adds the 10-day forecast and your driving profile to these averages.
Winter tyre rules in Italy
Winter tyres (or chains) are required between 15 November and 15 April on signed roads or in designated areas. Italy's rules vary by region and road; winter tyres or carried chains are typically required from 15 November to 15 April where signposted.