Frost dates for Greenville Maine Forestry Svc, ME
At Greenville Maine Forestry Svc, the median last spring frost (32°F) is May 7 and the median first fall frost is Oct 9, for a typical growing season of 153 days. For a 90% chance that the last frost has passed, wait until May 20. Nearby ZIP codes are in USDA hardiness zones 4a to 5a.
- May 7Last spring frost (median)50% chance of 32°F after this date
- May 20Safer planting date10% chance of 32°F after this date
- Oct 9First fall frost (median)50% chance of 32°F by this date
- 153 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 7 | May 21 | Jun 2 |
| 32°F | Apr 27 | May 7 | May 20 |
| 28°F | Apr 15 | Apr 28 | May 7 |
| 24°F | Apr 5 | Apr 17 | Apr 28 |
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 18 | Sep 29 | Oct 10 |
| 32°F | Sep 27 | Oct 9 | Oct 24 |
| 28°F | Oct 7 | Oct 22 | Nov 4 |
| 24°F | Oct 20 | Nov 2 | Nov 15 |
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 | 114 days | 130 days | 148 days |
| 32°F | 136 days | 153 days | 171 days |
| 28°F | 158 days | 177 days | 195 days |
| 24°F | 181 days | 199 days | 215 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 |
|---|---|---|---|
| 04442 | 4b | -25 to -20°F | 8 km |
| 04485 | 5a | -20 to -15°F | 13 km |
| 04464 | 5a | -20 to -15°F | 20 km |
| 04985 | 4b | -25 to -20°F | 26 km |
| 04406 | 5a | -20 to -15°F | 26 km |
| 04441 | 4a | -30 to -25°F | 34 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 USW00094626, at 45.4622, -69.5953, elevation 316 m (1,037 ft).
- Data quality: Representative (10+ years), 23 years of freeze data.
- Average days per year at or below 32°F: 171.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Moosehead (17 km)
- Brassua Dam (28 km)
- Sebec Lake (37 km)
- Barnard (40 km)
- E Sangerville (44 km)
- Dover-Foxcroft Wastewater Plant (44 km)
- Jackman (54 km)
- Long Falls Dam (54 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.