Frost dates for 63336Clarksville, MO
The average last spring frost in Clarksville is April 4 and the average first fall frost is November 1, giving a typical growing season of about 208 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 4
- Average first fall frost
- Nov 1
- Growing season
- 208 days
Safer after Apr 23 (1-in-10 risk)
Possible by Oct 19 (1-in-10 risk)
First frost typically in 2 days
Frost risk by date
NOAA reports frost dates as probabilities. The middle date is the average (a 50% chance). For spring, the 10% date is a safer planting date: frost after it happens in about 1 year in 10. Light frost (36°F) can damage tender plants; a hard freeze (28°F) kills most annuals.
| Temperature | Last spring: 90% / 50% / 10% chance | First fall: 10% / 50% / 90% chance | Growing season (50%) | Years with at least one |
|---|---|---|---|---|
| Light frost (36°F) | Apr 2 · Apr 16 · May 3 | Oct 9 · Oct 23 · Nov 2 | 188 days | 100% |
| Frost / freeze (32°F) | Mar 20 · Apr 4 · Apr 23 | Oct 19 · Nov 1 · Nov 15 | 208 days | 100% |
| Hard freeze (28°F) | Mar 9 · Mar 24 · Apr 8 | Oct 30 · Nov 11 · Nov 26 | 229 days | 100% |
Planting calendar for Clarksville
Planting windows from the University of Maryland Extension calendar, shifted to your average frost dates. Use them as a starting point and adjust for seed packet instructions and local conditions.
| Crop | Task | Window |
|---|---|---|
| Tomatoes | Start seeds indoors | Mar 4 – May 10 |
| Tomatoes | Transplant outdoors | Apr 20 – Jul 12 |
| Peppers | Start seeds indoors | Mar 4 – Apr 4 |
| Peppers | Transplant outdoors | May 4 – Jun 4 |
| Eggplant | Start seeds indoors | Mar 21 – Apr 19 |
| Eggplant | Transplant outdoors | May 4 – Jun 4 |
| Cucumbers | Sow outdoors | May 4 – Jul 22 |
| Summer squash | Sow outdoors | Apr 20 – Jun 4 |
| Winter squash & pumpkins | Sow outdoors | May 4 – Jun 4 |
| Snap beans | Sow outdoors | Apr 20 – Aug 14 |
| Sweet corn | Sow outdoors | Apr 20 – Jul 12 |
| Watermelon & cantaloupe | Sow outdoors | May 4 – Jun 4 |
| Okra | Sow outdoors | Apr 27 – May 20 |
| Peas | Sow outdoors (spring) | Mar 4 – Apr 19 |
| Potatoes | Plant outdoors (spring) | Mar 4 – May 4 |
| Onions | Start seeds indoors (spring) | Jan 21 – Feb 17 |
| Onions | Transplant outdoors (spring) | Mar 21 – Apr 19 |
| Broccoli | Start seeds indoors (spring) | Feb 14 – Mar 20 |
| Broccoli | Transplant outdoors (spring) | Mar 21 – Apr 19 |
| Broccoli | Start seeds indoors (fall) | Jul 2 – Jul 12 |
| Broccoli | Transplant outdoors (fall) | Aug 1 – Aug 12 |
| Cabbage | Start seeds indoors (spring) | Feb 4 – Mar 4 |
| Cabbage | Transplant outdoors (spring) | Mar 4 – Apr 4 |
| Cabbage | Start seeds indoors (fall) | Jun 22 – Jul 22 |
| Cabbage | Transplant outdoors (fall) | Jul 22 – Aug 22 |
| Leaf lettuce | Sow outdoors (spring) | Mar 4 – May 20 |
| Leaf lettuce | Sow outdoors (fall) | Jul 22 – Sep 7 |
| Spinach | Sow outdoors (spring) | Feb 25 – Apr 10 |
| Spinach | Sow outdoors (fall) | Aug 8 – Sep 12 |
| Radishes | Sow outdoors (spring) | Mar 4 – Apr 24 |
| Radishes | Sow outdoors (fall) | Jul 22 – Sep 22 |
| Kale | Sow outdoors (spring) | Mar 21 – Apr 10 |
| Kale | Sow outdoors (fall) | Jul 15 – Aug 22 |
| Carrots | Sow outdoors (spring) | Apr 4 – May 20 |
| Carrots | Sow outdoors (fall) | Jun 22 – Aug 7 |
| Garlic | Plant outdoors (fall) | Oct 22 – Nov 22 |
Where these dates come from
ZIP code 63336 is matched to the NOAA station Clarksville L&D 24, MO, 4 km away, at 460 ft elevation (252 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Clarksville L&D 24, MO (used) | 460 ft | Apr 4 | Nov 1 |
| Bowling Green 1 E, MO | 895 ft | Apr 13 | Oct 23 |
| Elsberry 1 S, MO | 475 ft | Apr 20 | Oct 20 |
| Pittsfield #2, IL | 670 ft | Apr 14 | Oct 21 |
Frost dates near Clarksville
- Pleasant Hill, IL 62366 · last Apr 4, first Nov 1
- Eolia, MO 63344 · last Apr 13, first Oct 23
- Annada, MO 63330 · last Apr 20, first Oct 20
- Louisiana, MO 63353 · last Apr 4, first Nov 1
- Nebo, IL 62355 · last Apr 4, first Nov 1
- Mozier, IL 62070 · last Apr 20, first Oct 20
- Whiteside, MO 63387 · last Apr 13, first Oct 23
- Rockport, IL 62370 · last Apr 14, first Oct 21
Frequently asked questions
- When is the last frost in Clarksville, MO?
- For ZIP code 63336, the average last spring frost (32°F) is April 4, based on NOAA 1991-2020 climate normals for the Clarksville L&D 24, MO weather station. There is a 1-in-10 chance of a frost after April 23.
- When is the first frost in Clarksville, MO?
- The average first fall frost (32°F) is November 1. There is a 1-in-10 chance of frost by October 19, so tender plants are at risk from that point on.
- How long is the growing season in 63336?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 208 days long.
- Are these frost dates a forecast?
- No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.