Frost dates for St. Charles Elm Point, MO
At St. Charles Elm Point, the median last spring frost (32°F) is Apr 8 and the median first fall frost is Oct 29, for a typical growing season of 203 days. For a 90% chance that the last frost has passed, wait until Apr 24. Nearby ZIP codes are in USDA hardiness zone 6b.
- Apr 8Last spring frost (median)50% chance of 32°F after this date
- Apr 24Safer planting date10% chance of 32°F after this date
- Oct 29First fall frost (median)50% chance of 32°F by this date
- 203 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 5 | Apr 21 | May 5 |
| 32°F | Mar 23 | Apr 8 | Apr 24 |
| 28°F | Mar 9 | Mar 30 | Apr 15 |
| 24°F | Feb 28 | Mar 16 | Apr 3 |
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 | Oct 7 | Oct 19 | Oct 31 |
| 32°F | Oct 16 | Oct 29 | Nov 12 |
| 28°F | Oct 29 | Nov 10 | Nov 28 |
| 24°F | Nov 6 | Nov 21 | Dec 8 |
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 | 161 days | 180 days | 200 days |
| 32°F | 183 days | 203 days | 225 days |
| 28°F | 204 days | 225 days | 249 days |
| 24°F | 227 days | 248 days | 273 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 |
|---|---|---|---|
| 63301 | 6b | -5 to 0°F | 7 km |
| 63045 | 6b | -5 to 0°F | 7 km |
| 62036 | 6b | -5 to 0°F | 13 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 USC00237397, at 38.8142, -90.5139, elevation 144 m (472 ft).
- Data quality: Representative (10+ years), 27 years of freeze data.
- Average days per year at or below 32°F: 104.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- St. Peters 2 SE (8 km)
- St. Louis Lambert Intl Airport (14 km)
- St. Charles 7 SSW (14 km)
- St. Charles Co Airport (15 km)
- Weldon Spring NWS (19 km)
- St. Louis Sprt Of S L Airport (21 km)
- St. Louis Sci Center (29 km)
- Elsberry 1 S (45 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.