Frost dates for Bremerton, WA
At Bremerton, the median last spring frost (32°F) is Mar 29 and the median first fall frost is Nov 14, for a typical growing season of 227 days. For a 90% chance that the last frost has passed, wait until Apr 24. Nearby ZIP codes are in USDA hardiness zones 8b to 9a.
- Mar 29Last spring frost (median)50% chance of 32°F after this date
- Apr 24Safer planting date10% chance of 32°F after this date
- Nov 14First fall frost (median)50% chance of 32°F by this date
- 227 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 7 | Apr 25 | May 13 |
| 32°F | Mar 5 | Mar 29 | Apr 24 |
| 28°F | Jan 24 | Feb 27 | Mar 27 |
| 24°F | Dec 9 | Jan 26 | Feb 24 |
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 4 | Oct 27 | Nov 13 |
| 32°F | Oct 26 | Nov 14 | Dec 1 |
| 28°F | Nov 10 | Nov 30 | Dec 24 |
| 24°F | Nov 23 | Dec 15 | Feb 1 |
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 | 158 days | 183 days | 210 days |
| 32°F | 197 days | 227 days | 257 days |
| 28°F | 239 days | 273 days | 314 days |
| 24°F | 291 days | 330 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 87% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 98337 | 9a | 20 to 25°F | 3 km |
| 98310 | 8b | 15 to 20°F | 5 km |
| 98312 | 8b | 15 to 20°F | 6 km |
| 98311 | 9a | 20 to 25°F | 7 km |
| 98366 | 9a | 20 to 25°F | 9 km |
| 98383 | 8b | 15 to 20°F | 11 km |
| 98367 | 8b | 15 to 20°F | 12 km |
| 98110 | 9a | 20 to 25°F | 14 km |
| 98380 | 8b | 15 to 20°F | 15 km |
| 98345 | 9a | 20 to 25°F | 15 km |
| 98359 | 8b | 15 to 20°F | 17 km |
| 98315 | 8b | 15 to 20°F | 17 km |
| 98392 | 9a | 20 to 25°F | 20 km |
| 98528 | 8b | 15 to 20°F | 21 km |
| 98370 | 8b | 15 to 20°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 USC00450872, at 47.5689, -122.6828, elevation 34 m (110 ft).
- Data quality: Representative (10+ years), 26 years of freeze data.
- Average days per year at or below 32°F: 42.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Seattle Boeing Field (29 km)
- Seattle Tacoma Intl Airport (31 km)
- Quilcene 2 SW (32 km)
- Tacoma Narrows Airport (34 km)
- Seattle Sand Point Wsfo (35 km)
- Renton Muni Airport (36 km)
- Kent (37 km)
- Tacoma #1 (41 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.