Frost dates for Chatham Muni Airport, MA
At Chatham Muni Airport, the median last spring frost (32°F) is Apr 13 and the median first fall frost is Nov 4, for a typical growing season of 206 days. For a 90% chance that the last frost has passed, wait until Apr 26. Nearby ZIP codes are in USDA hardiness zone 7b.
- Apr 13Last spring frost (median)50% chance of 32°F after this date
- Apr 26Safer planting date10% chance of 32°F after this date
- Nov 4First fall frost (median)50% chance of 32°F by this date
- 206 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 15 | Apr 27 | May 8 |
| 32°F | Apr 1 | Apr 13 | Apr 26 |
| 28°F | Mar 16 | Mar 31 | Apr 11 |
| 24°F | Mar 4 | Mar 17 | Apr 1 |
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 | Oct 10 | Oct 23 | Nov 5 |
| 32°F | Oct 21 | Nov 4 | Nov 18 |
| 28°F | Nov 3 | Nov 19 | Dec 3 |
| 24°F | Nov 19 | Dec 3 | Dec 20 |
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 | 159 days | 179 days | 198 days |
| 32°F | 186 days | 206 days | 224 days |
| 28°F | 214 days | 234 days | 255 days |
| 24°F | 239 days | 260 days | 282 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 |
|---|---|---|---|
| 02633 | 7b | 5 to 10°F | 1 km |
| 02659 | 7b | 5 to 10°F | 3 km |
| 02650 | 7b | 5 to 10°F | 3 km |
| 02645 | 7b | 5 to 10°F | 6 km |
| 02643 | 7b | 5 to 10°F | 9 km |
| 02631 | 7b | 5 to 10°F | 9 km |
| 02653 | 7b | 5 to 10°F | 9 km |
| 02642 | 7b | 5 to 10°F | 17 km |
| 02663 | 7b | 5 to 10°F | 23 km |
| 02667 | 7b | 5 to 10°F | 26 km |
| 02666 | 7b | 5 to 10°F | 33 km |
| 02652 | 7b | 5 to 10°F | 41 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 USW00094624, at 41.6875, -69.9933, elevation 21 m (68 ft).
- Data quality: Representative (10+ years), 21 years of freeze data.
- Average days per year at or below 32°F: 92.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Chatham (4 km)
- W Harwich (11 km)
- Hyannis Barnstable Muni Airport (24 km)
- Hyannis (26 km)
- E Sandwich (40 km)
- Nantucket Mem Airport (49 km)
- Edgartown (55 km)
- E Wareham (57 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.