Frost dates for Houlton Intl Airport, ME
At Houlton Intl Airport, the median last spring frost (32°F) is May 27 and the median first fall frost is Sep 18, for a typical growing season of 115 days. For a 90% chance that the last frost has passed, wait until Jun 10. Nearby ZIP codes are in USDA hardiness zone 4b.
- May 27Last spring frost (median)50% chance of 32°F after this date
- Jun 10Safer planting date10% chance of 32°F after this date
- Sep 18First fall frost (median)50% chance of 32°F by this date
- 115 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 27 | Jun 10 | Jun 28 |
| 32°F | May 9 | May 27 | Jun 10 |
| 28°F | Apr 28 | May 10 | May 28 |
| 24°F | Apr 15 | Apr 28 | May 10 |
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 | Aug 24 | Sep 7 | Sep 21 |
| 32°F | Sep 5 | Sep 18 | Oct 2 |
| 28°F | Sep 18 | Oct 1 | Oct 15 |
| 24°F | Sep 29 | Oct 13 | Oct 31 |
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 | 64 days | 89 days | 108 days |
| 32°F | 94 days | 115 days | 135 days |
| 28°F | 121 days | 143 days | 162 days |
| 24°F | 147 days | 168 days | 190 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 |
|---|---|---|---|
| 04761 | 4b | -25 to -20°F | 14 km |
| 04471 | 4b | -25 to -20°F | 24 km |
| 04763 | 4b | -25 to -20°F | 25 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 USW00014609, at 46.1236, -67.7928, elevation 145 m (476 ft).
- Data quality: Standard (24+ years of data), 29 years of freeze data.
- Average days per year at or below 32°F: 190.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Houlton 5n (10 km)
- Bridgewater (34 km)
- Danforth (52 km)
- Patten 2 (55 km)
- Presque Isle (61 km)
- Vanceboro No. 2 (69 km)
- Topsfield 2 (77 km)
- Caribou Muni Airport (85 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.