Frost dates for Hyannis Barnstable Muni Airport, MA
At Hyannis Barnstable Muni Airport, the median last spring frost (32°F) is Apr 22 and the median first fall frost is Oct 28, for a typical growing season of 188 days. For a 90% chance that the last frost has passed, wait until May 5. Nearby ZIP codes are in USDA hardiness zones 7a to 7b.
- Apr 22Last spring frost (median)50% chance of 32°F after this date
- May 5Safer planting date10% chance of 32°F after this date
- Oct 28First fall frost (median)50% chance of 32°F by this date
- 188 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 22 | May 3 | May 16 |
| 32°F | Apr 9 | Apr 22 | May 5 |
| 28°F | Mar 23 | Apr 7 | Apr 21 |
| 24°F | Mar 9 | Mar 24 | Apr 6 |
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 1 | Oct 14 | Oct 30 |
| 32°F | Oct 13 | Oct 28 | Nov 11 |
| 28°F | Oct 25 | Nov 9 | Nov 24 |
| 24°F | Nov 8 | Nov 25 | Dec 10 |
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 | 144 days | 164 days | 183 days |
| 32°F | 168 days | 188 days | 210 days |
| 28°F | 195 days | 216 days | 237 days |
| 24°F | 223 days | 244 days | 266 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 |
|---|---|---|---|
| 02673 | 7a | 0 to 5°F | 3 km |
| 02637 | 7a | 0 to 5°F | 4 km |
| 02675 | 7a | 0 to 5°F | 6 km |
| 02638 | 7b | 5 to 10°F | 10 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 USW00094720, at 41.6686, -70.2800, elevation 17 m (55 ft).
- Data quality: Representative (10+ years), 23 years of freeze data.
- Average days per year at or below 32°F: 108.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Hyannis (2 km)
- W Harwich (14 km)
- E Sandwich (17 km)
- Chatham Muni Airport (24 km)
- Chatham (27 km)
- E Wareham (34 km)
- Woods Hole Golf Club (35 km)
- Edgartown (37 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.