Frost dates for Deer Park Airport, WA
At Deer Park Airport, the median last spring frost (32°F) is May 22 and the median first fall frost is Sep 14, for a typical growing season of 112 days. For a 90% chance that the last frost has passed, wait until Jun 15. Nearby ZIP codes are in USDA hardiness zones 6a to 6b.
- May 22Last spring frost (median)50% chance of 32°F after this date
- Jun 15Safer planting date10% chance of 32°F after this date
- Sep 14First fall frost (median)50% chance of 32°F by this date
- 112 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 |
|---|---|---|---|
| 32°F | May 2 | May 22 | Jun 15 |
| 28°F | Apr 18 | May 3 | May 21 |
| 24°F | Mar 24 | Apr 19 | May 7 |
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 |
|---|---|---|---|
| 32°F | Aug 28 | Sep 14 | Oct 1 |
| 28°F | Sep 14 | Sep 29 | Oct 14 |
| 24°F | Sep 27 | Oct 10 | Nov 3 |
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 | 42 days | 72 days | 98 days |
| 32°F | 84 days | 112 days | 140 days |
| 28°F | 122 days | 146 days | 170 days |
| 24°F | 150 days | 178 days | 209 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 |
|---|---|---|---|
| 99006 | 6b | -5 to 0°F | 6 km |
| 99110 | 6a | -10 to -5°F | 12 km |
| 99003 | 6b | -5 to 0°F | 13 km |
| 99009 | 6b | -5 to 0°F | 14 km |
| 99005 | 6b | -5 to 0°F | 15 km |
| 99148 | 6a | -10 to -5°F | 18 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 USW00094119, at 47.9742, -117.4283, elevation 668 m (2,191 ft).
- Data quality: Representative (10+ years), 20 years of freeze data.
- Average days per year at or below 32°F: 174.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Spokane Felts Field (33 km)
- Spokane WFO (36 km)
- Newport (37 km)
- Spokane Intl Airport (40 km)
- Chewelah (41 km)
- Spokane 17 SSW (62 km)
- Davenport (65 km)
- Colville (76 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.