Frost dates for Osage City, KS
At Osage City, the median last spring frost (32°F) is Apr 13 and the median first fall frost is Oct 26, for a typical growing season of 194 days. For a 90% chance that the last frost has passed, wait until Apr 28. Nearby ZIP codes are in USDA hardiness zone 6b.
- Apr 13Last spring frost (median)50% chance of 32°F after this date
- Apr 28Safer planting date10% chance of 32°F after this date
- Oct 26First fall frost (median)50% chance of 32°F by this date
- 194 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 9 | Apr 24 | May 7 |
| 32°F | Mar 30 | Apr 13 | Apr 28 |
| 28°F | Mar 16 | Apr 2 | Apr 19 |
| 24°F | Mar 4 | Mar 24 | 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 | Sep 27 | Oct 15 | Oct 28 |
| 32°F | Oct 10 | Oct 26 | Nov 6 |
| 28°F | Oct 20 | Nov 3 | Nov 16 |
| 24°F | Oct 29 | Nov 11 | Nov 28 |
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 | 150 days | 172 days | 193 days |
| 32°F | 172 days | 194 days | 214 days |
| 28°F | 192 days | 213 days | 235 days |
| 24°F | 213 days | 235 days | 258 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 |
|---|---|---|---|
| 66523 | 6b | -5 to 0°F | 4 km |
| 66537 | 6b | -5 to 0°F | 15 km |
| 66413 | 6b | -5 to 0°F | 16 km |
| 66868 | 6b | -5 to 0°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 USC00146076, at 38.6361, -95.8031, elevation 334 m (1,094 ft).
- Data quality: Representative (10+ years), 11 years of freeze data.
- Average days per year at or below 32°F: 124.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Melvern Lake (17 km)
- Pomona Lake (21 km)
- Eskridge (36 km)
- Topeka Forbes Field (37 km)
- John Redmond Lake (43 km)
- Emporia 3 NW (43 km)
- Ottawa (45 km)
- Emporia Muni Airport (48 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.