Frost dates for W Rockport 1 NNW, ME
At W Rockport 1 NNW, the median last spring frost (32°F) is Apr 27 and the median first fall frost is Oct 19, for a typical growing season of 175 days. For a 90% chance that the last frost has passed, wait until May 9. Nearby ZIP codes are in USDA hardiness zones 5b to 6b.
- Apr 27Last spring frost (median)50% chance of 32°F after this date
- May 9Safer planting date10% chance of 32°F after this date
- Oct 19First fall frost (median)50% chance of 32°F by this date
- 175 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 22 |
| 32°F | Apr 17 | Apr 27 | May 9 |
| 28°F | Apr 4 | Apr 15 | Apr 26 |
| 24°F | Mar 24 | 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 28 | Oct 7 | Oct 21 |
| 32°F | Oct 5 | Oct 19 | Nov 3 |
| 28°F | Oct 14 | Oct 31 | Nov 12 |
| 24°F | Oct 26 | Nov 11 | 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 | 134 days | 152 days | 170 days |
| 32°F | 156 days | 175 days | 192 days |
| 28°F | 179 days | 197 days | 215 days |
| 24°F | 199 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 |
|---|---|---|---|
| 04856 | 6a | -10 to -5°F | 2 km |
| 04847 | 5b | -15 to -10°F | 6 km |
| 04841 | 6a | -10 to -5°F | 7 km |
| 04843 | 5b | -15 to -10°F | 8 km |
| 04861 | 6a | -10 to -5°F | 10 km |
| 04864 | 5b | -15 to -10°F | 11 km |
| 04862 | 5b | -15 to -10°F | 13 km |
| 04574 | 5b | -15 to -10°F | 21 km |
| 04853 | 6a | -10 to -5°F | 23 km |
| 04949 | 5b | -15 to -10°F | 25 km |
| 04863 | 6b | -5 to 0°F | 27 km |
| 04645 | 6b | -5 to 0°F | 44 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 USC00179593, at 44.1922, -69.1467, elevation 110 m (361 ft).
- Data quality: Standard (24+ years of data), 27 years of freeze data.
- Average days per year at or below 32°F: 148.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Tenants Harbor (23 km)
- Belfast (26 km)
- Newcastle (35 km)
- Gardiner (51 km)
- Wiscasset Airport (52 km)
- Augusta State Airport (54 km)
- Waterville Trtmt Plant (55 km)
- Westport Island (56 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.