Frost dates for 63370Olney, MO
The average last spring frost in Olney is April 14 and the average first fall frost is October 23, giving a typical growing season of about 191 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 14
- Average first fall frost
- Oct 23
- Growing season
- 191 days
Safer after May 3 (1-in-10 risk)
Possible by Oct 9 (1-in-10 risk)
Last frost typically in 164 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 11 · Apr 28 · May 14 | Sep 29 · Oct 14 · Oct 25 | 169 days | 100% |
| Frost / freeze (32°F) | Mar 31 · Apr 14 · May 3 | Oct 9 · Oct 23 · Nov 5 | 191 days | 100% |
| Hard freeze (28°F) | Mar 17 · Apr 3 · Apr 18 | Oct 20 · Nov 2 · Nov 18 | 213 days | 100% |
Planting calendar for Olney
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 14 – May 20 |
| Tomatoes | Transplant outdoors | Apr 30 – Jul 3 |
| Peppers | Start seeds indoors | Mar 14 – Apr 14 |
| Peppers | Transplant outdoors | May 14 – Jun 14 |
| Eggplant | Start seeds indoors | Mar 31 – Apr 29 |
| Eggplant | Transplant outdoors | May 14 – Jun 14 |
| Cucumbers | Sow outdoors | May 14 – Jul 13 |
| Summer squash | Sow outdoors | Apr 30 – Jun 14 |
| Winter squash & pumpkins | Sow outdoors | May 14 – Jun 14 |
| Snap beans | Sow outdoors | Apr 30 – Aug 5 |
| Sweet corn | Sow outdoors | Apr 30 – Jul 3 |
| Watermelon & cantaloupe | Sow outdoors | May 14 – Jun 14 |
| Okra | Sow outdoors | May 7 – May 30 |
| Peas | Sow outdoors (spring) | Mar 14 – Apr 29 |
| Potatoes | Plant outdoors (spring) | Mar 14 – May 14 |
| Onions | Start seeds indoors (spring) | Jan 31 – Feb 27 |
| Onions | Transplant outdoors (spring) | Mar 31 – Apr 29 |
| Broccoli | Start seeds indoors (spring) | Feb 24 – Mar 30 |
| Broccoli | Transplant outdoors (spring) | Mar 31 – Apr 29 |
| Broccoli | Start seeds indoors (fall) | Jun 23 – Jul 3 |
| Broccoli | Transplant outdoors (fall) | Jul 23 – Aug 3 |
| Cabbage | Start seeds indoors (spring) | Feb 14 – Mar 14 |
| Cabbage | Transplant outdoors (spring) | Mar 14 – Apr 14 |
| Cabbage | Start seeds indoors (fall) | Jun 13 – Jul 13 |
| Cabbage | Transplant outdoors (fall) | Jul 13 – Aug 13 |
| Leaf lettuce | Sow outdoors (spring) | Mar 14 – May 30 |
| Leaf lettuce | Sow outdoors (fall) | Jul 13 – Aug 29 |
| Spinach | Sow outdoors (spring) | Mar 7 – Apr 20 |
| Spinach | Sow outdoors (fall) | Jul 30 – Sep 3 |
| Radishes | Sow outdoors (spring) | Mar 14 – May 4 |
| Radishes | Sow outdoors (fall) | Jul 13 – Sep 13 |
| Kale | Sow outdoors (spring) | Mar 31 – Apr 20 |
| Kale | Sow outdoors (fall) | Jul 6 – Aug 13 |
| Carrots | Sow outdoors (spring) | Apr 14 – May 30 |
| Carrots | Sow outdoors (fall) | Jun 13 – Jul 29 |
| Garlic | Plant outdoors (fall) | Oct 13 – Nov 13 |
Where these dates come from
ZIP code 63370 is matched to the NOAA station Warrenton 1 N, MO, 29.1 km away, at 827 ft elevation (112 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Warrenton 1 N, MO (used) | 827 ft | Apr 14 | Oct 23 |
| Bowling Green 1 E, MO | 895 ft | Apr 13 | Oct 23 |
| Vandalia, MO | 764 ft | Apr 11 | Oct 23 |
| Elsberry 1 S, MO | 475 ft | Apr 20 | Oct 20 |
Frost dates near Olney
- Middletown, MO 63359 · last Apr 11, first Oct 23
- Bellflower, MO 63333 · last Apr 14, first Oct 23
- Truxton, MO 63381 · last Apr 14, first Oct 23
- Hawk Point, MO 63349 · last Apr 14, first Oct 23
- Silex, MO 63377 · last Apr 20, first Oct 20
- Whiteside, MO 63387 · last Apr 13, first Oct 23
- Jonesburg, MO 63351 · last Apr 14, first Oct 23
- High Hill, MO 63350 · last Apr 14, first Oct 23
Frequently asked questions
- When is the last frost in Olney, MO?
- For ZIP code 63370, the average last spring frost (32°F) is April 14, based on NOAA 1991-2020 climate normals for the Warrenton 1 N, MO weather station. There is a 1-in-10 chance of a frost after May 3.
- When is the first frost in Olney, MO?
- The average first fall frost (32°F) is October 23. There is a 1-in-10 chance of frost by October 9, so tender plants are at risk from that point on.
- How long is the growing season in 63370?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 191 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.