Frost dates for 64436Cosby, MO
The average last spring frost in Cosby is April 17 and the average first fall frost is October 19, giving a typical growing season of about 184 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 17
- Average first fall frost
- Oct 19
- Growing season
- 184 days
Safer after May 1 (1-in-10 risk)
Possible by Oct 4 (1-in-10 risk)
Last frost typically in 173 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 14 · Apr 28 · May 9 | Sep 25 · Oct 9 · Oct 22 | 165 days | 100% |
| Frost / freeze (32°F) | Apr 3 · Apr 17 · May 1 | Oct 4 · Oct 19 · Oct 30 | 184 days | 100% |
| Hard freeze (28°F) | Mar 22 · Apr 7 · Apr 21 | Oct 16 · Oct 28 · Nov 9 | 205 days | 100% |
Planting calendar for Cosby
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 17 – May 23 |
| Tomatoes | Transplant outdoors | May 3 – Jun 29 |
| Peppers | Start seeds indoors | Mar 17 – Apr 17 |
| Peppers | Transplant outdoors | May 17 – Jun 17 |
| Eggplant | Start seeds indoors | Apr 3 – May 2 |
| Eggplant | Transplant outdoors | May 17 – Jun 17 |
| Cucumbers | Sow outdoors | May 17 – Jul 9 |
| Summer squash | Sow outdoors | May 3 – Jun 17 |
| Winter squash & pumpkins | Sow outdoors | May 17 – Jun 17 |
| Snap beans | Sow outdoors | May 3 – Aug 1 |
| Sweet corn | Sow outdoors | May 3 – Jun 29 |
| Watermelon & cantaloupe | Sow outdoors | May 17 – Jun 17 |
| Okra | Sow outdoors | May 10 – Jun 2 |
| Peas | Sow outdoors (spring) | Mar 17 – May 2 |
| Potatoes | Plant outdoors (spring) | Mar 17 – May 17 |
| Onions | Start seeds indoors (spring) | Feb 3 – Mar 2 |
| Onions | Transplant outdoors (spring) | Apr 3 – May 2 |
| Broccoli | Start seeds indoors (spring) | Feb 27 – Apr 2 |
| Broccoli | Transplant outdoors (spring) | Apr 3 – May 2 |
| Broccoli | Start seeds indoors (fall) | Jun 19 – Jun 29 |
| Broccoli | Transplant outdoors (fall) | Jul 19 – Jul 30 |
| Cabbage | Start seeds indoors (spring) | Feb 17 – Mar 17 |
| Cabbage | Transplant outdoors (spring) | Mar 17 – Apr 17 |
| Cabbage | Start seeds indoors (fall) | Jun 9 – Jul 9 |
| Cabbage | Transplant outdoors (fall) | Jul 9 – Aug 9 |
| Leaf lettuce | Sow outdoors (spring) | Mar 17 – Jun 2 |
| Leaf lettuce | Sow outdoors (fall) | Jul 9 – Aug 25 |
| Spinach | Sow outdoors (spring) | Mar 10 – Apr 23 |
| Spinach | Sow outdoors (fall) | Jul 26 – Aug 30 |
| Radishes | Sow outdoors (spring) | Mar 17 – May 7 |
| Radishes | Sow outdoors (fall) | Jul 9 – Sep 9 |
| Kale | Sow outdoors (spring) | Apr 3 – Apr 23 |
| Kale | Sow outdoors (fall) | Jul 2 – Aug 9 |
| Carrots | Sow outdoors (spring) | Apr 17 – Jun 2 |
| Carrots | Sow outdoors (fall) | Jun 9 – Jul 25 |
| Garlic | Plant outdoors (fall) | Oct 9 – Nov 9 |
Where these dates come from
ZIP code 64436 is matched to the NOAA station Cosby 2W, MO, 0.9 km away, at 910 ft elevation (47 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Cosby 2W, MO (used) | 910 ft | Apr 17 | Oct 19 |
| St Joseph Rosecrans Ap, MO | 818 ft | Apr 19 | Oct 17 |
| Amity 4 Ne, MO | 974 ft | Apr 19 | Oct 19 |
| Troy 3N, KS | 1,040 ft | Apr 19 | Oct 19 |
Frost dates near Cosby
- Helena, MO 64459 · last Apr 19, first Oct 19
- Saint Joseph, MO 64506 · last Apr 19, first Oct 17
- Easton, MO 64443 · last Apr 19, first Oct 17
- Savannah, MO 64485 · last Apr 19, first Oct 19
- Clarksdale, MO 64430 · last Apr 19, first Oct 19
- Amity, MO 64422 · last Apr 19, first Oct 19
- Stewartsville, MO 64490 · last Apr 19, first Oct 19
- Union Star, MO 64494 · last Apr 19, first Oct 19
Frequently asked questions
- When is the last frost in Cosby, MO?
- For ZIP code 64436, the average last spring frost (32°F) is April 17, based on NOAA 1991-2020 climate normals for the Cosby 2W, MO weather station. There is a 1-in-10 chance of a frost after May 1.
- When is the first frost in Cosby, MO?
- The average first fall frost (32°F) is October 19. There is a 1-in-10 chance of frost by October 4, so tender plants are at risk from that point on.
- How long is the growing season in 64436?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 184 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.