Last Frost Date Anchorage: Frost Dates, Late Frost Risk & Growing Season
When is the last spring frost and the first autumn frost in Anchorage? Frost dates from 30 years of data, the risk of late frost, frost-free days and planting dates.
The frost season in Anchorage
- Last frost (average): April 28
- In 1 year out of 10 it still freezes on May 9.
- First frost: October 7
- Frost-free season: 158 days
- Frost after 15 May: in 7 % of years
Frost days per month in Anchorage
- January: 30.1 · -11 °C
- February: 26.9 · -9 °C
- March: 28.5 · -7 °C
- April: 16 · -1 °C
- May: 1.6 · 4 °C
- June: 0 · 9 °C
- July: 0 · 12 °C
- August: 0 · 11 °C
- September: 1.3 · 6 °C
- October: 15 · -1 °C
- November: 26.9 · -7 °C
- December: 30 · -10 °C
- Matched to the average lows of a weather station 7 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.