Last frost date in Union, Missouri
April 11
Average last frost in spring. In an early year (1 in 10) it's over by March 26; in a late year (1 in 10) it comes after April 28.
October 23
Average first frost in fall. 1 year in 10 it comes by October 9.
Source: NOAA U.S. Climate Normals 1991–2020, station Union (USC00238515), 0.6 miles from Union, elevation 540 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.
| Early year | Average | Late year | |
|---|---|---|---|
| Last frost in spring | Mar 26 | Apr 11 | Apr 28 |
| First frost in fall | Oct 9 | Oct 23 | Nov 5 |
Frost-free days in an average year: 194
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | Apr 22 | Oct 13 |
| Frost (32°F) | Every year | Apr 11 | Oct 23 |
| Hard freeze (28°F) | Every year | Mar 31 | Nov 3 |
Nights at 32°F or colder in an average year: 101
What to plant now in Union
- Spring planting calendar for an average last frost around April 10 Union: April 11
- Fall planting calendar for an average first frost around October 20 Union: October 23
Planting dates: USDA Home and Garden Bulletin No. 9 (1967), “Suburban and Farm Vegetable Gardens,” tables 4 and 5. How we match the table.
Nearby in Missouri
- Washington 8 mi · last frost Apr 8
- Wildwood 20 mi · last frost Apr 12
- Chesterfield 27 mi · last frost Apr 4
- O'Fallon 28 mi · last frost Apr 10
- St. Peters 32 mi · last frost Apr 9
Updated