Frost dates for Washington, KS
At Washington, the median last spring frost (32°F) is Apr 24 and the median first fall frost is Oct 14, for a typical growing season of 171 days. For a 90% chance that the last frost has passed, wait until May 8. Nearby ZIP codes are in USDA hardiness zone 6a.
- Apr 24Last spring frost (median)50% chance of 32°F after this date
- May 8Safer planting date10% chance of 32°F after this date
- Oct 14First fall frost (median)50% chance of 32°F by this date
- 171 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 20 | May 2 | May 16 |
| 32°F | Apr 10 | Apr 24 | May 8 |
| 28°F | Mar 31 | Apr 14 | Apr 28 |
| 24°F | Mar 18 | Apr 3 | Apr 20 |
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 20 | Oct 4 | Oct 16 |
| 32°F | Sep 29 | Oct 14 | Oct 25 |
| 28°F | Oct 9 | Oct 23 | Nov 4 |
| 24°F | Oct 19 | Nov 1 | Nov 14 |
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 | 137 days | 154 days | 171 days |
| 32°F | 152 days | 171 days | 190 days |
| 28°F | 170 days | 191 days | 210 days |
| 24°F | 189 days | 210 days | 233 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 |
|---|---|---|---|
| 66968 | 6a | -10 to -5°F | 3 km |
| 66958 | 6a | -10 to -5°F | 14 km |
| 66953 | 6a | -10 to -5°F | 15 km |
| 66943 | 6a | -10 to -5°F | 17 km |
| 66945 | 6a | -10 to -5°F | 17 km |
| 66946 | 6a | -10 to -5°F | 18 km |
| 66944 | 6a | -10 to -5°F | 21 km |
| 66933 | 6a | -10 to -5°F | 22 km |
| 66962 | 6a | -10 to -5°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 USC00148578, at 39.8089, -97.0550, elevation 398 m (1,305 ft).
- Data quality: Standard (24+ years of data), 30 years of freeze data.
- Average days per year at or below 32°F: 130.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Marysville (36 km)
- Clay Center (49 km)
- Belleville (50 km)
- Concordia Muni Airport (58 km)
- Concordia 1 W (59 km)
- Frankfort 6ne (60 km)
- Courtland (72 km)
- Tuttle Creek Lake (74 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.