Frost dates for Hollis, ME
At Hollis, the median last spring frost (32°F) is May 14 and the median first fall frost is Sep 30, for a typical growing season of 136 days. For a 90% chance that the last frost has passed, wait until May 28. Nearby ZIP codes are in USDA hardiness zones 5a to 5b.
- May 14Last spring frost (median)50% chance of 32°F after this date
- May 28Safer planting date10% chance of 32°F after this date
- Sep 30First fall frost (median)50% chance of 32°F by this date
- 136 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 14 | May 27 | Jun 8 |
| 32°F | May 3 | May 14 | May 28 |
| 28°F | Apr 22 | May 3 | May 13 |
| 24°F | Apr 6 | Apr 19 | Apr 30 |
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 6 | Sep 19 | Oct 1 |
| 32°F | Sep 16 | Sep 30 | Oct 12 |
| 28°F | Sep 28 | Oct 10 | Oct 27 |
| 24°F | Oct 7 | Oct 23 | Nov 7 |
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 | 98 days | 115 days | 132 days |
| 32°F | 118 days | 136 days | 152 days |
| 28°F | 142 days | 159 days | 180 days |
| 24°F | 168 days | 189 days | 207 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 |
|---|---|---|---|
| 04042 | 5b | -15 to -10°F | 5 km |
| 04061 | 5a | -20 to -15°F | 6 km |
| 04030 | 5b | -15 to -10°F | 7 km |
| 04048 | 5a | -20 to -15°F | 10 km |
| 04087 | 5b | -15 to -10°F | 10 km |
| 04056 | 5b | -15 to -10°F | 15 km |
| 04095 | 5b | -15 to -10°F | 19 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 USC00173862, at 43.6475, -70.6750, elevation 93 m (304 ft).
- Data quality: Representative (10+ years), 25 years of freeze data.
- Average days per year at or below 32°F: 184.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- West Buxton 2 NNW (7 km)
- Sanford 2 NNW (23 km)
- East Hiram (26 km)
- Windham 2nw (29 km)
- Portland Intl Jetport (30 km)
- Kennebunkport (36 km)
- Gray (43 km)
- Fryeburg E Slopes Airport (44 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.