Frost dates · Maine
Maine frost dates,
county by county.
Last spring frost and first fall frost probability data for all 16 counties in Maine, computed from the NOAA 1991–2020 Climate Normals. Every county page surfaces the full probability table at three temperature thresholds plus crop-specific planting guidance.
Variation across Maine
29 days separate the earliest and latest counties.
The median last spring frost in Androscoggin County is April 11 — 29 days earlier than Franklin County at May 10. Statewide averages aren't useful planting tools; pick your county below for the data that actually applies to your fields.
By frost timing
Counties sorted by last spring frost.
Latest at top, earliest at bottom. In most states this matches the north-to-south gradient.
- Franklin CountySpring May 10·Fall Oct 7150-day season
- York CountySpring May 2·Fall Oct 7158-day season
- Aroostook CountySpring May 1·Fall Oct 6158-day season
- Somerset CountySpring May 1·Fall Oct 8160-day season
- Oxford CountySpring Apr 30·Fall Oct 8161-day season
- Piscataquis CountySpring Apr 29·Fall Oct 19173-day season
- Sagadahoc CountySpring Apr 29·Fall Oct 19173-day season
- Hancock CountySpring Apr 27·Fall Oct 21177-day season
- Waldo CountySpring Apr 27·Fall Oct 19175-day season
- Penobscot CountySpring Apr 24·Fall Oct 18177-day season
- Washington CountySpring Apr 21·Fall Oct 29191-day season
- Cumberland CountySpring Apr 15·Fall Nov 1200-day season
- Kennebec CountySpring Apr 15·Fall Oct 31199-day season
- Knox CountySpring Apr 14·Fall Nov 6206-day season
- Lincoln CountySpring Apr 14·Fall Nov 1201-day season
- Androscoggin CountySpring Apr 11·Fall Nov 1204-day season