Frost dates for 64433Conception, MO
The average last spring frost in Conception is April 17 and the average first fall frost is October 20, 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 20
- Growing season
- 184 days
Safer after Apr 30 (1-in-10 risk)
Possible by Oct 3 (1-in-10 risk)
Last frost typically in 174 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 27 · May 7 | Sep 25 · Oct 10 · Oct 24 | 165 days | 100% |
| Frost / freeze (32°F) | Apr 3 · Apr 17 · Apr 30 | Oct 3 · Oct 20 · Nov 2 | 184 days | 100% |
| Hard freeze (28°F) | Mar 25 · Apr 8 · Apr 22 | Oct 13 · Oct 30 · Nov 14 | 203 days | 100% |
Planting calendar for Conception
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 30 |
| 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 10 |
| Summer squash | Sow outdoors | May 3 – Jun 17 |
| Winter squash & pumpkins | Sow outdoors | May 17 – Jun 17 |
| Snap beans | Sow outdoors | May 3 – Aug 2 |
| Sweet corn | Sow outdoors | May 3 – Jun 30 |
| 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 20 – Jun 30 |
| Broccoli | Transplant outdoors (fall) | Jul 20 – Jul 31 |
| Cabbage | Start seeds indoors (spring) | Feb 17 – Mar 17 |
| Cabbage | Transplant outdoors (spring) | Mar 17 – Apr 17 |
| Cabbage | Start seeds indoors (fall) | Jun 10 – Jul 10 |
| Cabbage | Transplant outdoors (fall) | Jul 10 – Aug 10 |
| Leaf lettuce | Sow outdoors (spring) | Mar 17 – Jun 2 |
| Leaf lettuce | Sow outdoors (fall) | Jul 10 – Aug 26 |
| Spinach | Sow outdoors (spring) | Mar 10 – Apr 23 |
| Spinach | Sow outdoors (fall) | Jul 27 – Aug 31 |
| Radishes | Sow outdoors (spring) | Mar 17 – May 7 |
| Radishes | Sow outdoors (fall) | Jul 10 – Sep 10 |
| Kale | Sow outdoors (spring) | Apr 3 – Apr 23 |
| Kale | Sow outdoors (fall) | Jul 3 – Aug 10 |
| Carrots | Sow outdoors (spring) | Apr 17 – Jun 2 |
| Carrots | Sow outdoors (fall) | Jun 10 – Jul 26 |
| Garlic | Plant outdoors (fall) | Oct 10 – Nov 10 |
Where these dates come from
ZIP code 64433 is matched to the NOAA station Conception, MO, 0.5 km away, at 1,108 ft elevation (4 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Conception, MO (used) | 1,108 ft | Apr 17 | Oct 20 |
| Maryville 2E, MO | 985 ft | Apr 19 | Oct 17 |
| Grant City 5Wsw, MO | 1,089 ft | Apr 20 | Oct 19 |
| Albany, MO | 875 ft | Apr 17 | Oct 21 |
Frost dates near Conception
- Conception Junction, MO 64434 · last Apr 17, first Oct 20
- Clyde, MO 64432 · last Apr 17, first Oct 20
- Guilford, MO 64457 · last Apr 17, first Oct 20
- Barnard, MO 64423 · last Apr 17, first Oct 20
- Stanberry, MO 64489 · last Apr 17, first Oct 20
- Ravenwood, MO 64479 · last Apr 19, first Oct 17
- Maryville, MO 64468 · last Apr 19, first Oct 17
- Rea, MO 64480 · last Apr 17, first Oct 20
Frequently asked questions
- When is the last frost in Conception, MO?
- For ZIP code 64433, the average last spring frost (32°F) is April 17, based on NOAA 1991-2020 climate normals for the Conception, MO weather station. There is a 1-in-10 chance of a frost after April 30.
- When is the first frost in Conception, MO?
- The average first fall frost (32°F) is October 20. There is a 1-in-10 chance of frost by October 3, so tender plants are at risk from that point on.
- How long is the growing season in 64433?
- 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.