Frost dates for Leavenworth, KS
At Leavenworth, the median last spring frost (32°F) is Apr 12 and the median first fall frost is Oct 27, for a typical growing season of 196 days. For a 90% chance that the last frost has passed, wait until Apr 25. Nearby ZIP codes are in USDA hardiness zones 6a to 6b.
- Apr 12Last spring frost (median)50% chance of 32°F after this date
- Apr 25Safer planting date10% chance of 32°F after this date
- Oct 27First fall frost (median)50% chance of 32°F by this date
- 196 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 8 | Apr 21 | May 3 |
| 32°F | Mar 31 | Apr 12 | Apr 25 |
| 28°F | Mar 18 | Apr 3 | Apr 17 |
| 24°F | Mar 8 | Mar 25 | Apr 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 |
|---|---|---|---|
| 36°F | Oct 1 | Oct 18 | Oct 30 |
| 32°F | Oct 13 | Oct 27 | Nov 7 |
| 28°F | Oct 23 | Nov 4 | Nov 18 |
| 24°F | Oct 31 | Nov 13 | Nov 29 |
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 | 157 days | 178 days | 196 days |
| 32°F | 176 days | 196 days | 216 days |
| 28°F | 194 days | 215 days | 236 days |
| 24°F | 214 days | 235 days | 257 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 |
|---|---|---|---|
| 66027 | 6b | -5 to 0°F | 4 km |
| 64028 | 6b | -5 to 0°F | 9 km |
| 64098 | 6a | -10 to -5°F | 16 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 USC00144588, at 39.3256, -94.9189, elevation 265 m (870 ft).
- Data quality: Representative (10+ years), 20 years of freeze data.
- Average days per year at or below 32°F: 105.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Leavenworth 3sw (5 km)
- Bonner Springs (29 km)
- Oskaloosa 4 NE (32 km)
- Atchison (32 km)
- Lawrence Muni Airport (43 km)
- Perry Lake (48 km)
- Valley Falls 3 SW (49 km)
- Lawrence (50 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.