Frost dates for Hiawatha 1 S, KS
At Hiawatha 1 S, the median last spring frost (32°F) is Apr 14 and the median first fall frost is Oct 22, for a typical growing season of 188 days. For a 90% chance that the last frost has passed, wait until Apr 28. Nearby ZIP codes are in USDA hardiness zone 6a.
- Apr 14Last spring frost (median)50% chance of 32°F after this date
- Apr 28Safer planting date10% chance of 32°F after this date
- Oct 22First fall frost (median)50% chance of 32°F by this date
- 188 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 11 | Apr 24 | May 7 |
| 32°F | Apr 1 | Apr 14 | Apr 28 |
| 28°F | Mar 20 | Apr 5 | Apr 19 |
| 24°F | Mar 7 | Mar 27 | Apr 10 |
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 10 | Oct 24 |
| 32°F | Oct 5 | Oct 22 | Nov 2 |
| 28°F | Oct 18 | Nov 1 | Nov 13 |
| 24°F | Oct 28 | Nov 9 | 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 | 147 days | 167 days | 186 days |
| 32°F | 168 days | 188 days | 207 days |
| 28°F | 189 days | 209 days | 230 days |
| 24°F | 206 days | 227 days | 254 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 |
|---|---|---|---|
| 66434 | 6a | -10 to -5°F | 4 km |
| 66532 | 6a | -10 to -5°F | 13 km |
| 66527 | 6a | -10 to -5°F | 16 km |
| 66425 | 6a | -10 to -5°F | 16 km |
| 66515 | 6a | -10 to -5°F | 18 km |
| 66534 | 6a | -10 to -5°F | 26 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 USC00143634, at 39.8356, -95.5319, elevation 323 m (1,061 ft).
- Data quality: Estimated from nearby stations (2+ years), 10 years of freeze data.
- Average days per year at or below 32°F: 132.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Horton (19 km)
- Troy 3n (38 km)
- Holton (46 km)
- Atchison (46 km)
- Centralia (52 km)
- Baileyville (56 km)
- Valley Falls 3 SW (59 km)
- Oskaloosa 4 NE (70 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.