Frost Dates for Wentzville, MO
In Wentzville, MO, the average last spring frost is around Apr 10 and the average first fall frost around Oct 26, for a growing season of about 199 days. For frost-tender plants, wait until Apr 26, when the chance of frost drops to 10%.
Based on NOAA 1991–2020 records from the Weldon Spring Nws, MO weather station, 13 miles away, elevation 610 ft. Frost can come earlier in low spots and valleys and later near cities and large lakes.
Frost probability by date
Chance of a 32°F frost after the spring date, or before the fall date.
| Chance | Last spring frost | First fall frost |
|---|---|---|
| 10% | Apr 26 | Oct 12 |
| 20% | Apr 20 | Oct 17 |
| 30% | Apr 16 | Oct 20 |
| 40% | Apr 13 | Oct 23 |
| 50% | Apr 10 | Oct 26 |
| 60% | Apr 7 | Oct 29 |
| 70% | Apr 4 | Oct 31 |
| 80% | Mar 31 | Nov 2 |
| 90% | Mar 26 | Nov 8 |
Light frost vs. hard freeze
Average (50%) dates for each temperature. Tender plants are damaged at 36°F; most hardy crops survive until 28°F.
| Temperature | Last in spring | First in fall |
|---|---|---|
| Light frost (36°F) | Apr 22 | Oct 16 |
| Frost / freeze (32°F) | Apr 10 | Oct 26 |
| Hard freeze (28°F) | Mar 31 | Nov 5 |
Planting calendar for Wentzville
Transplant Apr 17 – May 1
Transplant Apr 24 – May 8
Transplant Apr 24 – May 8
Transplant Apr 17 – May 1
Sow or transplant Apr 17 – May 1
Sow or transplant Apr 17 – May 1
Sow or transplant Apr 24 – May 8
Sow or transplant Mar 13 – Mar 27
Fall sowing Aug 31 – Sep 28
Fall sowing Aug 31 – Sep 21
Fall sowing Aug 17 – Aug 31
Sow or transplant Mar 13 – Mar 27
Fall sowing Aug 17 – Sep 14
Transplant Mar 27 – Apr 10
Fall sowing Aug 3 – Aug 17
Transplant Mar 20 – Apr 3
Fall sowing Aug 3 – Aug 17
Fall sowing Aug 3 – Aug 17
Fall sowing Sep 14 – Oct 5
Fall sowing Aug 17 – Aug 31
Plant Mar 13 – Mar 27
Based on the average last frost (Apr 10) and first frost (Oct 26). The dashed lines mark those dates. Seed packets list days to maturity; adjust for your varieties.