Frost dates for 65791Thayer, MO
The average last spring frost in Thayer is April 12 and the average first fall frost is October 24, giving a typical growing season of about 194 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 12
- Average first fall frost
- Oct 24
- Growing season
- 194 days
Safer after Apr 27 (1-in-10 risk)
Possible by Oct 11 (1-in-10 risk)
Last frost typically in 160 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 9 · Apr 24 · May 6 | Oct 3 · Oct 16 · Oct 26 | 174 days | 100% |
| Frost / freeze (32°F) | Mar 27 · Apr 12 · Apr 27 | Oct 11 · Oct 24 · Nov 5 | 194 days | 100% |
| Hard freeze (28°F) | Mar 13 · Apr 1 · Apr 16 | Oct 21 · Nov 3 · Nov 20 | 217 days | 100% |
Planting calendar for Thayer
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 12 – May 18 |
| Tomatoes | Transplant outdoors | Apr 28 – Jul 4 |
| Peppers | Start seeds indoors | Mar 12 – Apr 12 |
| Peppers | Transplant outdoors | May 12 – Jun 12 |
| Eggplant | Start seeds indoors | Mar 29 – Apr 27 |
| Eggplant | Transplant outdoors | May 12 – Jun 12 |
| Cucumbers | Sow outdoors | May 12 – Jul 14 |
| Summer squash | Sow outdoors | Apr 28 – Jun 12 |
| Winter squash & pumpkins | Sow outdoors | May 12 – Jun 12 |
| Snap beans | Sow outdoors | Apr 28 – Aug 6 |
| Sweet corn | Sow outdoors | Apr 28 – Jul 4 |
| Watermelon & cantaloupe | Sow outdoors | May 12 – Jun 12 |
| Okra | Sow outdoors | May 5 – May 28 |
| Peas | Sow outdoors (spring) | Mar 12 – Apr 27 |
| Potatoes | Plant outdoors (spring) | Mar 12 – May 12 |
| Onions | Start seeds indoors (spring) | Jan 29 – Feb 25 |
| Onions | Transplant outdoors (spring) | Mar 29 – Apr 27 |
| Broccoli | Start seeds indoors (spring) | Feb 22 – Mar 28 |
| Broccoli | Transplant outdoors (spring) | Mar 29 – Apr 27 |
| Broccoli | Start seeds indoors (fall) | Jun 24 – Jul 4 |
| Broccoli | Transplant outdoors (fall) | Jul 24 – Aug 4 |
| Cabbage | Start seeds indoors (spring) | Feb 12 – Mar 12 |
| Cabbage | Transplant outdoors (spring) | Mar 12 – Apr 12 |
| Cabbage | Start seeds indoors (fall) | Jun 14 – Jul 14 |
| Cabbage | Transplant outdoors (fall) | Jul 14 – Aug 14 |
| Leaf lettuce | Sow outdoors (spring) | Mar 12 – May 28 |
| Leaf lettuce | Sow outdoors (fall) | Jul 14 – Aug 30 |
| Spinach | Sow outdoors (spring) | Mar 5 – Apr 18 |
| Spinach | Sow outdoors (fall) | Jul 31 – Sep 4 |
| Radishes | Sow outdoors (spring) | Mar 12 – May 2 |
| Radishes | Sow outdoors (fall) | Jul 14 – Sep 14 |
| Kale | Sow outdoors (spring) | Mar 29 – Apr 18 |
| Kale | Sow outdoors (fall) | Jul 7 – Aug 14 |
| Carrots | Sow outdoors (spring) | Apr 12 – May 28 |
| Carrots | Sow outdoors (fall) | Jun 14 – Jul 30 |
| Garlic | Plant outdoors (fall) | Oct 14 – Nov 14 |
Where these dates come from
ZIP code 65791 is matched to the NOAA station Mammoth Spring, AR, 4.3 km away, at 502 ft elevation (66 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Mammoth Spring, AR (used) | 502 ft | Apr 12 | Oct 24 |
| Alton, MO | 813 ft | Apr 17 | Oct 21 |
| Hardy, AR | 400 ft | Apr 4 | Oct 31 |
| Salem, AR | 680 ft | Apr 8 | Oct 30 |
Frost dates near Thayer
- Koshkonong, MO 65692 · last Apr 17, first Oct 21
- Mammoth Spring, AR 72554 · last Apr 12, first Oct 24
- Brandsville, MO 65688 · last Apr 16, first Oct 21
- Camp, AR 72520 · last Apr 8, first Oct 30
- Alton, MO 65606 · last Apr 17, first Oct 21
- Myrtle, MO 65778 · last Apr 12, first Oct 24
- Couch, MO 65690 · last Apr 12, first Oct 24
- Cherokee Village, AR 72525 · last Apr 4, first Oct 31
Frequently asked questions
- When is the last frost in Thayer, MO?
- For ZIP code 65791, the average last spring frost (32°F) is April 12, based on NOAA 1991-2020 climate normals for the Mammoth Spring, AR weather station. There is a 1-in-10 chance of a frost after April 27.
- When is the first frost in Thayer, MO?
- The average first fall frost (32°F) is October 24. There is a 1-in-10 chance of frost by October 11, so tender plants are at risk from that point on.
- How long is the growing season in 65791?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 194 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.