Frost dates for Leavenworth 3sw, KS
At Leavenworth 3sw, the median last spring frost (32°F) is Apr 19 and the median first fall frost is Oct 19, for a typical growing season of 181 days. For a 90% chance that the last frost has passed, wait until May 4. Nearby ZIP codes are in USDA hardiness zone 6b.
- Apr 19Last spring frost (median)50% chance of 32°F after this date
- May 4Safer planting date10% chance of 32°F after this date
- Oct 19First fall frost (median)50% chance of 32°F by this date
- 181 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 16 | Apr 30 | May 13 |
| 32°F | Apr 5 | Apr 19 | May 4 |
| 28°F | Mar 25 | Apr 9 | Apr 23 |
| 24°F | Mar 12 | Mar 30 | Apr 14 |
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 25 | Oct 8 | Oct 22 |
| 32°F | Oct 2 | Oct 19 | Oct 30 |
| 28°F | Oct 15 | Oct 27 | Nov 9 |
| 24°F | Oct 25 | Nov 5 | Nov 21 |
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 | 143 days | 160 days | 179 days |
| 32°F | 160 days | 181 days | 200 days |
| 28°F | 182 days | 200 days | 220 days |
| 24°F | 199 days | 220 days | 243 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 |
|---|---|---|---|
| 66048 | 6b | -5 to 0°F | 3 km |
| 66043 | 6b | -5 to 0°F | 6 km |
| 66020 | 6b | -5 to 0°F | 15 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 USC00144589, at 39.2850, -94.9500, elevation 266 m (871 ft).
- Data quality: Estimated from nearby stations (2+ years), 8 years of freeze data.
- Average days per year at or below 32°F: 136.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Leavenworth (5 km)
- Bonner Springs (25 km)
- Oskaloosa 4 NE (28 km)
- Atchison (35 km)
- Lawrence Muni Airport (38 km)
- Perry Lake (44 km)
- Lawrence (45 km)
- Valley Falls 3 SW (46 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.