Frost dates for Trenton, MO
At Trenton, the median last spring frost (32°F) is Apr 16 and the median first fall frost is Oct 20, for a typical growing season of 184 days. For a 90% chance that the last frost has passed, wait until Apr 29. Nearby ZIP codes are in USDA hardiness zone 6a.
- Apr 16Last spring frost (median)50% chance of 32°F after this date
- Apr 29Safer planting date10% chance of 32°F after this date
- Oct 20First fall frost (median)50% chance of 32°F by this date
- 184 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 13 | Apr 27 | May 9 |
| 32°F | Apr 3 | Apr 16 | Apr 29 |
| 28°F | Mar 22 | Apr 6 | Apr 21 |
| 24°F | Mar 10 | Mar 29 | Apr 12 |
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 26 | Oct 11 | Oct 23 |
| 32°F | Oct 5 | Oct 20 | Nov 1 |
| 28°F | Oct 16 | Oct 29 | Nov 11 |
| 24°F | Oct 25 | Nov 7 | Nov 25 |
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 | 145 days | 165 days | 183 days |
| 32°F | 165 days | 184 days | 204 days |
| 28°F | 184 days | 204 days | 225 days |
| 24°F | 203 days | 224 days | 248 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 |
|---|---|---|---|
| 64683 | 6a | -10 to -5°F | 1 km |
| 64652 | 6a | -10 to -5°F | 18 km |
| 64641 | 6a | -10 to -5°F | 20 km |
| 64646 | 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 USC00238444, at 40.0825, -93.6086, elevation 255 m (837 ft).
- Data quality: Representative (10+ years), 22 years of freeze data.
- Average days per year at or below 32°F: 127.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Spickard 7 W (20 km)
- Chillicothe Agri-Sci (29 km)
- Chillicothe 2s (35 km)
- Princeton (35 km)
- Gallatin 1w (36 km)
- Bethany (41 km)
- Chillicothe 22 ENE (46 km)
- Linneus 3se (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.