Last Frost Date St Helens: Frost Dates, Late Frost Risk & Growing Season
When is the last spring frost and the first autumn frost in St Helens? Frost dates from 30 years of data, the risk of late frost, frost-free days and planting dates.
The frost season in St Helens
- Last frost (average): March 25
- In 1 year out of 10 it still freezes on April 15.
- First frost: November 26
- Frost-free season: 243 days
- Frost after 15 May: in 0 % of years
Frost days per month in St Helens
- January: 7.8 · 2 °C
- February: 7.4 · 2 °C
- March: 4 · 3 °C
- April: 0.9 · 5 °C
- May: 0 · 8 °C
- June: 0 · 11 °C
- July: 0 · 13 °C
- August: 0 · 13 °C
- September: 0 · 11 °C
- October: 0.2 · 8 °C
- November: 2 · 5 °C
- December: 7.1 · 3 °C
- Matched to the average lows of a weather station 38 km away – accurate to about ±1–2 weeks.
- Daily minimum temperatures 2 m above ground over 30 years (1991–2020), NASA POWER; station data: Deutscher Wetterdienst (CC BY 4.0). Ground frost can form while the air at 2 m is still +2 to +3 °C.