Frost dates for Green City 5n, MO
At Green City 5n, the median last spring frost (32°F) is Apr 26 and the median first fall frost is Oct 14, for a typical growing season of 169 days. For a 90% chance that the last frost has passed, wait until May 12. Nearby ZIP codes are in USDA hardiness zones 5b to 6a.
- Apr 26Last spring frost (median)50% chance of 32°F after this date
- May 12Safer planting date10% chance of 32°F after this date
- Oct 14First fall frost (median)50% chance of 32°F by this date
- 169 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 19 | May 5 | May 21 |
| 32°F | Apr 11 | Apr 26 | May 12 |
| 28°F | Apr 1 | Apr 14 | Apr 30 |
| 24°F | Mar 19 | Apr 5 | Apr 20 |
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 20 | Oct 3 | Oct 17 |
| 32°F | Sep 30 | Oct 14 | Oct 27 |
| 28°F | Oct 9 | Oct 24 | Nov 5 |
| 24°F | Oct 21 | Nov 1 | Nov 16 |
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 | 129 days | 149 days | 169 days |
| 32°F | 149 days | 169 days | 187 days |
| 28°F | 169 days | 189 days | 210 days |
| 24°F | 190 days | 209 days | 232 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 |
|---|---|---|---|
| 63545 | 5b | -15 to -10°F | 10 km |
| 63560 | 5b | -15 to -10°F | 14 km |
| 63544 | 6a | -10 to -5°F | 15 km |
| 63567 | 6a | -10 to -5°F | 22 km |
| 63556 | 6a | -10 to -5°F | 24 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 USC00233416, at 40.3503, -92.9492, elevation 316 m (1,035 ft).
- Data quality: Representative (10+ years), 12 years of freeze data.
- Average days per year at or below 32°F: 139.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Unionville (15 km)
- Kirksville (36 km)
- Kirksville Regional Airport (44 km)
- Princeton (54 km)
- Chillicothe 22 ENE (56 km)
- Linneus 3se (57 km)
- Trenton (63 km)
- Brookfield (66 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.