Frost dates for Augusta State Airport, ME
At Augusta State Airport, the median last spring frost (32°F) is Apr 27 and the median first fall frost is Oct 16, for a typical growing season of 172 days. For a 90% chance that the last frost has passed, wait until May 7. Nearby ZIP codes are in USDA hardiness zone 5b.
- Apr 27Last spring frost (median)50% chance of 32°F after this date
- May 7Safer planting date10% chance of 32°F after this date
- Oct 16First fall frost (median)50% chance of 32°F by this date
- 172 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 | Apr 28 | May 8 | May 20 |
| 32°F | Apr 15 | Apr 27 | May 7 |
| 28°F | Apr 3 | Apr 15 | Apr 26 |
| 24°F | Mar 23 | Apr 4 | Apr 16 |
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 24 | Oct 4 | Oct 17 |
| 32°F | Oct 2 | Oct 16 | Oct 31 |
| 28°F | Oct 14 | Oct 31 | Nov 12 |
| 24°F | Oct 29 | Nov 10 | Nov 24 |
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 | 132 days | 149 days | 165 days |
| 32°F | 154 days | 172 days | 192 days |
| 28°F | 179 days | 197 days | 215 days |
| 24°F | 202 days | 219 days | 237 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 |
|---|---|---|---|
| 04347 | 5b | -15 to -10°F | 4 km |
| 04330 | 5b | -15 to -10°F | 5 km |
| 04351 | 5b | -15 to -10°F | 6 km |
| 04364 | 5b | -15 to -10°F | 13 km |
| 04355 | 5b | -15 to -10°F | 14 km |
| 04363 | 5b | -15 to -10°F | 18 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 USW00014605, at 44.3206, -69.7972, elevation 107 m (350 ft).
- Data quality: Standard (24+ years of data), 27 years of freeze data.
- Average days per year at or below 32°F: 147.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Gardiner (11 km)
- Waterville Trtmt Plant (26 km)
- Livermore Falls 1 E (33 km)
- Turner (37 km)
- Newcastle (37 km)
- New Sharon (39 km)
- Wiscasset Airport (40 km)
- Lewiston (41 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.