Last spring frost
Apr 11
Frost Dates for Vandalia, MO
First fall frost
Oct 23
Growing season
192 days
Hardiness zone
6b
In an average year around Vandalia, MO, the last spring frost (32°F) is about Apr 11 and the first fall frost is about Oct 23, giving roughly a 192-day growing season. To be safe most years, wait until Mar 31 before setting out tender plants.
Last spring frost
Dates the last frost of spring typically ends. Plant tender crops after the risk has passed for your comfort level.
| Frost intensity | Early (10%) | Average (50%) | Late (90%) |
|---|---|---|---|
| Light (36°F) | May 7 | Apr 23 | Apr 9 |
| Freeze (32°F) | Apr 25 | Apr 11 | Mar 31 |
| Hard (28°F) | Apr 15 | Apr 1 | Mar 17 |
| Severe (24°F) | Apr 6 | Mar 22 | Mar 7 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 7 | May 2 | Apr 29 | Apr 26 | Apr 23 | Apr 20 | Apr 17 | Apr 13 | Apr 9 |
| 32°F | Apr 25 | Apr 20 | Apr 18 | Apr 13 | Apr 11 | Apr 8 | Apr 6 | Apr 3 | Mar 31 |
| 28°F | Apr 15 | Apr 10 | Apr 7 | Apr 4 | Apr 1 | Mar 30 | Mar 27 | Mar 23 | Mar 17 |
| 24°F | Apr 6 | Apr 1 | Mar 30 | Mar 26 | Mar 22 | Mar 19 | Mar 16 | Mar 12 | Mar 7 |
| 20°F | Mar 29 | Mar 24 | Mar 20 | Mar 16 | Mar 13 | Mar 10 | Mar 7 | Mar 3 | Feb 28 |
| 16°F | Mar 21 | Mar 16 | Mar 12 | Mar 8 | Mar 5 | Mar 3 | Feb 28 | Feb 24 | Feb 18 |
First fall frost
Dates the first frost of fall typically arrives. Count back by a crop's days-to-maturity to know your planting cutoff.
| Frost intensity | Early (10%) | Average (50%) | Late (90%) |
|---|---|---|---|
| Light (36°F) | Sep 28 | Oct 14 | Oct 24 |
| Freeze (32°F) | Oct 7 | Oct 23 | Nov 3 |
| Hard (28°F) | Oct 19 | Nov 1 | Nov 14 |
| Severe (24°F) | Oct 30 | Nov 10 | Nov 27 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 28 | Oct 3 | Oct 6 | Oct 10 | Oct 14 | Oct 16 | Oct 19 | Oct 21 | Oct 24 |
| 32°F | Oct 7 | Oct 14 | Oct 17 | Oct 20 | Oct 23 | Oct 25 | Oct 27 | Oct 31 | Nov 3 |
| 28°F | Oct 19 | Oct 23 | Oct 27 | Oct 30 | Nov 1 | Nov 3 | Nov 5 | Nov 8 | Nov 14 |
| 24°F | Oct 30 | Nov 1 | Nov 5 | Nov 7 | Nov 10 | Nov 13 | Nov 16 | Nov 21 | Nov 27 |
| 20°F | Nov 6 | Nov 10 | Nov 13 | Nov 17 | Nov 20 | Nov 24 | Nov 28 | Dec 1 | Dec 7 |
| 16°F | Nov 13 | Nov 19 | Nov 23 | Nov 27 | Nov 30 | Dec 2 | Dec 7 | Dec 13 | Dec 19 |
Growing season is measured at 32°F with about 50% probability. Hardiness zone from the 2023 USDA map; frost normals from NOAA 1991-2020.
Where this data comes from
@endif These dates are computed from the nearest official weather station with long-term records: Vandalia, Mo, about 0.3 miles away@if(!empty($station['elevation_ft'])), at 764 ft elevation. The further the station and the greater the elevation difference from your yard, the more your local frost timing can vary.
How we calculate these dates
Frost and freeze dates come from the NOAA 1991–2020 U.S. Climate Normals, the National Oceanic and Atmospheric Administration's 30-year averages for each weather station. A date shown at the 50% level is the median: in half of years the frost falls on or before it. The 10% and 90% columns show the early and late ends of the range, so you can plant on the odds you're comfortable with. These are long-term averages, not a forecast for this year - always check your local outlook before planting.
Source: NOAA National Centers for Environmental Information, 1991–2020 Climate Normals (public domain). Harman is not affiliated with or endorsed by NOAA.
Frequently asked questions
When is the last frost in Vandalia, MO?
On average, the last spring frost (32°F) around Vandalia, MO is about Apr 11. In cooler years it can run later, so for a safer bet many gardeners wait until Mar 31.
When is the first frost in the fall?
The first fall frost around Vandalia, MO typically arrives about Oct 23. Count back by a crop's days to maturity to find the latest date you can plant it.
When can I plant tomatoes and other tender crops?
Tender crops like tomatoes, peppers and basil are damaged by frost, so wait until the last spring frost has passed - around Apr 11 on average, or Mar 31 to be safe most years.
How long is the growing season here?
The frost-free growing season (between the last spring and first fall 32°F frost) is about 192 days in a typical year.
Are these dates a forecast for this year?
No. They are 30-year averages from the NOAA 1991–2020 Climate Normals, not a prediction for the current year. Use them for planning and always check your local weather forecast before planting or protecting crops.
Local weather for 63382 Planting calendar → Missouri frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026