Frost dates for Spokane Felts Field, WA
At Spokane Felts Field, the median last spring frost (32°F) is Apr 26 and the median first fall frost is Oct 15, for a typical growing season of 170 days. For a 90% chance that the last frost has passed, wait until May 10. Nearby ZIP codes are in USDA hardiness zones 6b to 7a.
- Apr 26Last spring frost (median)50% chance of 32°F after this date
- May 10Safer planting date10% chance of 32°F after this date
- Oct 15First fall frost (median)50% chance of 32°F by this date
- 170 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 27 | May 9 | May 25 |
| 32°F | Apr 10 | Apr 26 | May 10 |
| 28°F | Mar 16 | Apr 4 | Apr 26 |
| 24°F | Feb 25 | Mar 12 | Mar 30 |
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 | Sep 19 | Oct 1 | Oct 15 |
| 32°F | Sep 30 | Oct 15 | Oct 31 |
| 28°F | Oct 11 | Oct 27 | Nov 13 |
| 24°F | Oct 21 | Nov 8 | Nov 26 |
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 | 124 days | 143 days | 162 days |
| 32°F | 149 days | 170 days | 193 days |
| 28°F | 179 days | 205 days | 231 days |
| 24°F | 216 days | 241 days | 267 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 |
|---|---|---|---|
| 99212 | 7a | 0 to 5°F | 2 km |
| 99207 | 7a | 0 to 5°F | 5 km |
| 99202 | 7a | 0 to 5°F | 5 km |
| 99258 | 7a | 0 to 5°F | 6 km |
| 99217 | 6b | -5 to 0°F | 8 km |
| 99216 | 7a | 0 to 5°F | 8 km |
| 99206 | 7a | 0 to 5°F | 8 km |
| 99203 | 6b | -5 to 0°F | 9 km |
| 99205 | 7a | 0 to 5°F | 9 km |
| 99223 | 6b | -5 to 0°F | 10 km |
| 99037 | 7a | 0 to 5°F | 10 km |
| 99218 | 7a | 0 to 5°F | 11 km |
| 99027 | 6b | -5 to 0°F | 15 km |
| 99208 | 6b | -5 to 0°F | 15 km |
| 99016 | 6b | -5 to 0°F | 18 km |
| 99036 | 6b | -5 to 0°F | 19 km |
| 99023 | 6b | -5 to 0°F | 19 km |
| 99019 | 6b | -5 to 0°F | 19 km |
| 99021 | 6b | -5 to 0°F | 21 km |
| 99025 | 6b | -5 to 0°F | 22 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 USW00094176, at 47.6831, -117.3214, elevation 595 m (1,953 ft).
- Data quality: Representative (10+ years), 22 years of freeze data.
- Average days per year at or below 32°F: 123.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Spokane Intl Airport (17 km)
- Spokane WFO (23 km)
- Spokane 17 SSW (33 km)
- Deer Park Airport (33 km)
- Rosalia (50 km)
- Newport (59 km)
- Davenport (63 km)
- St. John (69 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.