Frost dates for Millinocket Muni Airport, ME
At Millinocket Muni Airport, the median last spring frost (32°F) is May 8 and the median first fall frost is Oct 1, for a typical growing season of 143 days. For a 90% chance that the last frost has passed, wait until May 24. Nearby ZIP codes are in USDA hardiness zone 5a.
- May 8Last spring frost (median)50% chance of 32°F after this date
- May 24Safer planting date10% chance of 32°F after this date
- Oct 1First fall frost (median)50% chance of 32°F by this date
- 143 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 9 | May 22 | Jun 4 |
| 32°F | Apr 27 | May 8 | May 24 |
| 28°F | Apr 17 | Apr 28 | May 9 |
| 24°F | Apr 6 | Apr 18 | Apr 29 |
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 9 | Sep 22 | Oct 3 |
| 32°F | Sep 19 | Oct 1 | Oct 14 |
| 28°F | Sep 30 | Oct 13 | Oct 30 |
| 24°F | Oct 9 | Oct 28 | Nov 11 |
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 | 101 days | 120 days | 139 days |
| 32°F | 122 days | 143 days | 162 days |
| 28°F | 149 days | 168 days | 188 days |
| 24°F | 171 days | 192 days | 212 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 100% |
Closest ZIP codes (each is closer to another station)
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 04430 | 5a | -20 to -15°F | 7 km |
| 04460 | 5a | -20 to -15°F | 13 km |
| 04733 | 5a | -20 to -15°F | 24 km |
| 04457 | 5a | -20 to -15°F | 26 km |
| 04777 | 5a | -20 to -15°F | 28 km |
| 04459 | 5a | -20 to -15°F | 28 km |
| 04495 | 5a | -20 to -15°F | 33 km |
| 04776 | 5a | -20 to -15°F | 35 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 USW00014610, at 45.6478, -68.6925, elevation 124 m (406 ft).
- Data quality: Standard (24+ years of data), 24 years of freeze data.
- Average days per year at or below 32°F: 168.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Millinocket (1 km)
- Millinocket Wastewater (2 km)
- Lincoln Sanitary District/wtp (34 km)
- Patten 2 (45 km)
- Barnard (53 km)
- Sebec Lake (61 km)
- Dover-Foxcroft Wastewater Plant (64 km)
- Danforth (65 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.