Frost dates for Newport, NH
At Newport, the median last spring frost (32°F) is May 14 and the median first fall frost is Oct 1, for a typical growing season of 140 days. For a 90% chance that the last frost has passed, wait until May 29. Nearby ZIP codes are in USDA hardiness zones 5a to 6a.
- May 14Last spring frost (median)50% chance of 32°F after this date
- May 29Safer planting date10% chance of 32°F after this date
- Oct 1First fall frost (median)50% chance of 32°F by this date
- 140 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 12 | May 27 | Jun 8 |
| 32°F | Apr 30 | May 14 | May 29 |
| 28°F | Apr 19 | May 1 | May 17 |
| 24°F | Apr 4 | Apr 19 | May 3 |
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 21 | Oct 2 |
| 32°F | Sep 19 | Oct 1 | Oct 12 |
| 28°F | Oct 1 | Oct 11 | Oct 28 |
| 24°F | Oct 7 | Oct 22 | 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 | 117 days | 136 days |
| 32°F | 121 days | 140 days | 158 days |
| 28°F | 143 days | 163 days | 182 days |
| 24°F | 164 days | 187 days | 208 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 |
|---|---|---|---|
| 03773 | 5a | -20 to -15°F | 2 km |
| 03751 | 5b | -15 to -10°F | 11 km |
| 03743 | 5b | -15 to -10°F | 12 km |
| 03745 | 5b | -15 to -10°F | 15 km |
| 03753 | 5a | -20 to -15°F | 16 km |
| 03601 | 6a | -10 to -5°F | 18 km |
| 03607 | 5b | -15 to -10°F | 21 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 USC00275868, at 43.3772, -72.1811, elevation 235 m (770 ft).
- Data quality: Standard (24+ years of data), 28 years of freeze data.
- Average days per year at or below 32°F: 186.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Mount Sunapee (10 km)
- Bradford 2 (20 km)
- Grafton (28 km)
- Lebanon Muni Airport (29 km)
- Salisbury (36 km)
- Hanover (37 km)
- Hopkinton Lake (41 km)
- Walpole 2s Nepp (43 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.