Last spring frost
Apr 9
Frost Dates for Summer Set, MO
First fall frost
Oct 26
Growing season
197 days
Hardiness zone
6b
In an average year around Summer Set, MO, the last spring frost (32°F) is about Apr 9 and the first fall frost is about Oct 26, giving roughly a 197-day growing season. To be safe most years, wait until Mar 25 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 8 | Apr 22 | Apr 5 |
| Freeze (32°F) | Apr 25 | Apr 9 | Mar 25 |
| Hard (28°F) | Apr 15 | Mar 31 | Mar 12 |
| Severe (24°F) | Apr 3 | Mar 19 | Mar 1 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 8 | May 2 | Apr 29 | Apr 25 | Apr 22 | Apr 19 | Apr 15 | Apr 11 | Apr 5 |
| 32°F | Apr 25 | Apr 20 | Apr 16 | Apr 13 | Apr 9 | Apr 6 | Apr 3 | Mar 31 | Mar 25 |
| 28°F | Apr 15 | Apr 9 | Apr 4 | Apr 2 | Mar 31 | Mar 26 | Mar 23 | Mar 19 | Mar 12 |
| 24°F | Apr 3 | Mar 29 | Mar 25 | Mar 22 | Mar 19 | Mar 15 | Mar 10 | Mar 7 | Mar 1 |
| 20°F | Mar 26 | Mar 20 | Mar 16 | Mar 12 | Mar 8 | Mar 5 | Mar 2 | Feb 26 | Feb 18 |
| 16°F | Mar 17 | Mar 11 | Mar 7 | Mar 3 | Mar 1 | Feb 25 | Feb 21 | Feb 14 | Feb 5 |
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) | Oct 4 | Oct 17 | Oct 28 |
| Freeze (32°F) | Oct 14 | Oct 26 | Nov 8 |
| Hard (28°F) | Oct 23 | Nov 5 | Nov 23 |
| Severe (24°F) | Nov 2 | Nov 18 | Dec 4 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 4 | Oct 9 | Oct 12 | Oct 15 | Oct 17 | Oct 19 | Oct 22 | Oct 24 | Oct 28 |
| 32°F | Oct 14 | Oct 19 | Oct 22 | Oct 24 | Oct 26 | Oct 29 | Oct 31 | Nov 3 | Nov 8 |
| 28°F | Oct 23 | Oct 28 | Nov 1 | Nov 3 | Nov 5 | Nov 8 | Nov 12 | Nov 16 | Nov 23 |
| 24°F | Nov 2 | Nov 6 | Nov 10 | Nov 14 | Nov 18 | Nov 22 | Nov 26 | Dec 1 | Dec 4 |
| 20°F | Nov 9 | Nov 16 | Nov 21 | Nov 26 | Nov 29 | Dec 1 | Dec 5 | Dec 10 | Dec 16 |
| 16°F | Nov 19 | Nov 26 | Dec 1 | Dec 4 | Dec 9 | Dec 13 | Dec 18 | Dec 23 | Dec 29 |
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: Festus, Mo, about 12.8 miles away@if(!empty($station['elevation_ft'])), at 600 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 Summer Set, MO?
On average, the last spring frost (32°F) around Summer Set, MO is about Apr 9. In cooler years it can run later, so for a safer bet many gardeners wait until Mar 25.
When is the first frost in the fall?
The first fall frost around Summer Set, MO typically arrives about Oct 26. 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 9 on average, or Mar 25 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 197 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 63020 Planting calendar → Missouri frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026