Frost dates for Farmington, ME
At Farmington, the median last spring frost (32°F) is May 16 and the median first fall frost is Sep 26, for a typical growing season of 130 days. For a 90% chance that the last frost has passed, wait until Jun 1. Nearby ZIP codes are in USDA hardiness zone 5a.
- May 16Last spring frost (median)50% chance of 32°F after this date
- Jun 1Safer planting date10% chance of 32°F after this date
- Sep 26First fall frost (median)50% chance of 32°F by this date
- 130 daysGrowing season (median)between 32°F freezes
Last spring frost dates
The chance that the temperature drops to the threshold after each date.
| Temperature | 90% chance later | 50% chance later | 10% chance later |
|---|---|---|---|
| 36°F | May 15 | May 30 | Jun 10 |
| 32°F | May 3 | May 16 | Jun 1 |
| 28°F | Apr 22 | May 3 | May 19 |
| 24°F | Apr 8 | Apr 21 | May 3 |
First fall frost dates
The chance that the temperature has dropped to the threshold by each date.
| Temperature | 10% chance by | 50% chance by | 90% chance by |
|---|---|---|---|
| 36°F | Sep 2 | Sep 16 | Sep 28 |
| 32°F | Sep 14 | Sep 26 | Oct 9 |
| 28°F | Sep 23 | Oct 5 | Oct 22 |
| 24°F | Oct 3 | Oct 19 | Nov 6 |
Growing season length
Days between the last spring and first fall freeze, as the length reached in 9, 5 and 1 out of 10 years.
| Temperature | 9 in 10 years at least | 5 in 10 years at least | 1 in 10 years at least |
|---|---|---|---|
| 36°F | 90 days | 108 days | 126 days |
| 32°F | 110 days | 130 days | 149 days |
| 28°F | 134 days | 155 days | 174 days |
| 24°F | 160 days | 181 days | 202 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 100% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 04992 | 5a | -20 to -15°F | 3 km |
| 04938 | 5a | -20 to -15°F | 5 km |
| 04234 | 5a | -20 to -15°F | 9 km |
| 04984 | 5a | -20 to -15°F | 9 km |
| 04294 | 5a | -20 to -15°F | 11 km |
| 04956 | 5a | -20 to -15°F | 13 km |
| 04983 | 5a | -20 to -15°F | 28 km |
Not the official USDA Plant Hardiness Zone Map. Zones shown here are the values published in the USDA-ARS / Oregon State University PRISM Group 2023 ZIP code tables, shown unaltered. For the official interactive map, visit planthardiness.ars.usda.gov.
About this station
- NOAA station ID USC00172765, at 44.6894, -70.1564, elevation 123 m (405 ft).
- Data quality: Standard (24+ years of data), 30 years of freeze data.
- Average days per year at or below 32°F: 183.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- New Sharon (14 km)
- Livermore Falls 1 E (24 km)
- Madison (24 km)
- Rumford 1 SSE (35 km)
- Hartford (37 km)
- Waterville Trtmt Plant (44 km)
- Rumford 6sw (45 km)
- Turner (46 km)
Sources
- NOAA National Centers for Environmental Information, U.S. Climate Normals 1991–2020, annual/seasonal normals by station (version 1.0.1), file dated June 27, 2023; documentation.
- USDA Agricultural Research Service and PRISM Group, Oregon State University, 2023 Plant Hardiness Zone Map ZIP code tables (CONUS, Alaska, Hawaii, Puerto Rico), files dated November 17, 2023. Data © PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed November 1, 2026. Official map: planthardiness.ars.usda.gov.
- U.S. Census Bureau, 2024 Gazetteer ZIP Code Tabulation Areas file, dated August 30, 2024 (ZIP centroids used to find the nearest station).
Freeze dates are 30-year probabilities, not forecasts. Check your local forecast before planting tender plants.