Frost dates for Everett Snohomish Airport, WA
At Everett Snohomish Airport, the median last spring frost (32°F) is Mar 9 and the median first fall frost is Nov 17, for a typical growing season of 250 days. For a 90% chance that the last frost has passed, wait until Mar 29. Nearby ZIP codes are in USDA hardiness zones 8b to 9a.
- Mar 9Last spring frost (median)50% chance of 32°F after this date
- Mar 29Safer planting date10% chance of 32°F after this date
- Nov 17First fall frost (median)50% chance of 32°F by this date
- 250 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 | Mar 15 | Apr 3 | Apr 27 |
| 32°F | Feb 15 | Mar 9 | Mar 29 |
| 28°F | Jan 1 | Feb 13 | Mar 9 |
| 24°F | Dec 6 | Jan 17 | 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 19 | Nov 2 | Nov 20 |
| 32°F | Oct 31 | Nov 17 | Dec 7 |
| 28°F | Nov 15 | Dec 6 | Jan 8 |
| 24°F | Nov 23 | Dec 19 | Feb 5 |
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 | 185 days | 211 days | 236 days |
| 32°F | 224 days | 250 days | 285 days |
| 28°F | 262 days | 300 days | 340 days |
| 24°F | 301 days | 340 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 98% |
| 24°F | 74% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 98204 | 9a | 20 to 25°F | 2 km |
| 98275 | 8b | 15 to 20°F | 2 km |
| 98087 | 9a | 20 to 25°F | 5 km |
| 98208 | 8b | 15 to 20°F | 7 km |
| 98037 | 9a | 20 to 25°F | 8 km |
| 98026 | 9a | 20 to 25°F | 9 km |
| 98012 | 8b | 15 to 20°F | 10 km |
| 98236 | 8b | 15 to 20°F | 11 km |
| 98036 | 9a | 20 to 25°F | 11 km |
| 98020 | 9a | 20 to 25°F | 14 km |
| 98260 | 8b | 15 to 20°F | 19 km |
| 98346 | 9a | 20 to 25°F | 21 km |
| 98340 | 8b | 15 to 20°F | 22 km |
| 98364 | 9a | 20 to 25°F | 24 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 USW00024222, at 47.9078, -122.2803, elevation 185 m (606 ft).
- Data quality: Representative (10+ years), 22 years of freeze data.
- Average days per year at or below 32°F: 29.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Everett (10 km)
- Monroe (22 km)
- Seattle Sand Point Wsfo (25 km)
- Arlington (34 km)
- Seattle Boeing Field (42 km)
- Startup 1 E (42 km)
- Port Townsend (42 km)
- Coupeville 1 S (45 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.