Frost dates for Hamilton 2w, MO
At Hamilton 2w, the median last spring frost (32°F) is Apr 23 and the median first fall frost is Oct 17, for a typical growing season of 175 days. For a 90% chance that the last frost has passed, wait until May 6. Nearby ZIP codes are in USDA hardiness zone 6a.
- Apr 23Last spring frost (median)50% chance of 32°F after this date
- May 6Safer planting date10% chance of 32°F after this date
- Oct 17First fall frost (median)50% chance of 32°F by this date
- 175 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 21 | May 2 | May 16 |
| 32°F | Apr 9 | Apr 23 | May 6 |
| 28°F | Mar 30 | Apr 13 | Apr 26 |
| 24°F | Mar 15 | Apr 2 | Apr 17 |
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 23 | Oct 7 | Oct 20 |
| 32°F | Oct 2 | Oct 17 | Oct 29 |
| 28°F | Oct 13 | Oct 26 | Nov 8 |
| 24°F | Oct 21 | Nov 3 | Nov 18 |
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 | 136 days | 156 days | 174 days |
| 32°F | 157 days | 175 days | 195 days |
| 28°F | 175 days | 196 days | 215 days |
| 24°F | 196 days | 215 days | 238 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 |
|---|---|---|---|
| 64644 | 6a | -10 to -5°F | 5 km |
| 64649 | 6a | -10 to -5°F | 6 km |
| 64650 | 6a | -10 to -5°F | 12 km |
| 64625 | 6a | -10 to -5°F | 20 km |
| 64637 | 6a | -10 to -5°F | 21 km |
| 64671 | 6a | -10 to -5°F | 23 km |
| 64624 | 6a | -10 to -5°F | 28 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 USC00233568, at 39.7425, -94.0347, elevation 274 m (900 ft).
- Data quality: Representative (10+ years), 25 years of freeze data.
- Average days per year at or below 32°F: 141.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Cameron (19 km)
- Gallatin 1w (19 km)
- Amity 4 NE (32 km)
- Chillicothe Agri-Sci (40 km)
- Chillicothe 2s (43 km)
- Kearney 3e (49 km)
- Trenton (52 km)
- Richmond 3s (56 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.