Last Frost Date London: Frost Dates, Late Frost Risk & Growing Season

When is the last spring frost and the first autumn frost in London? Frost dates from 30 years of data, the risk of late frost, frost-free days and planting dates.

The frost season in London

• Last frost (average): March 20
• In 1 year out of 10 it still freezes on April 9.
• First frost: November 22
• Frost-free season: 253 days
• Frost after 15 May: in 0 % of years

Frost days per month in London

• January: 7.6 · 3 °C
• February: 7.5 · 3 °C
• March: 3.1 · 4 °C
• April: 0.7 · 6 °C
• May: 0 · 9 °C
• June: 0 · 12 °C
• July: 0 · 14 °C
• August: 0 · 14 °C
• September: 0 · 12 °C
• October: 0.1 · 9 °C
• November: 2 · 5 °C
• December: 6.4 · 3 °C

• Matched to the average lows of a weather station 24 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.

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