Frost dates for Tenants Harbor, ME
At Tenants Harbor, the median last spring frost (32°F) is Apr 27 and the median first fall frost is Oct 25, for a typical growing season of 178 days. For a 90% chance that the last frost has passed, wait until May 8. Nearby ZIP codes are in USDA hardiness zones 6a to 7a.
- Apr 27Last spring frost (median)50% chance of 32°F after this date
- May 8Safer planting date10% chance of 32°F after this date
- Oct 25First fall frost (median)50% chance of 32°F by this date
- 178 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 29 | May 9 | May 24 |
| 32°F | Apr 17 | Apr 27 | May 8 |
| 28°F | Apr 3 | Apr 14 | Apr 24 |
| 24°F | Mar 19 | Apr 2 | Apr 15 |
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 30 | Oct 11 | Oct 25 |
| 32°F | Oct 10 | Oct 25 | Nov 6 |
| 28°F | Oct 25 | Nov 6 | Nov 19 |
| 24°F | Nov 6 | Nov 19 | Dec 1 |
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 | 133 days | 153 days | 170 days |
| 32°F | 160 days | 178 days | 196 days |
| 28°F | 189 days | 205 days | 223 days |
| 24°F | 212 days | 230 days | 249 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 |
|---|---|---|---|
| 04563 | 6a | -10 to -5°F | 4 km |
| 04859 | 6a | -10 to -5°F | 5 km |
| 04860 | 6b | -5 to 0°F | 6 km |
| 04858 | 6a | -10 to -5°F | 8 km |
| 04855 | 6b | -5 to 0°F | 9 km |
| 04547 | 6a | -10 to -5°F | 9 km |
| 04854 | 6a | -10 to -5°F | 12 km |
| 04852 | 6b | -5 to 0°F | 26 km |
| 04851 | 7a | 0 to 5°F | 31 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 USC00176881, at 43.9919, -69.2167, elevation 6 m (21 ft).
- Data quality: Standard (24+ years of data), 27 years of freeze data.
- Average days per year at or below 32°F: 124.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- W Rockport 1 NNW (23 km)
- Newcastle (26 km)
- Wiscasset Airport (40 km)
- Westport Island (41 km)
- Belfast (48 km)
- Bath (52 km)
- Gardiner (52 km)
- Brunswick NAS (58 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.