Frost dates for 65320Arrow Rock, MO
The average last spring frost in Arrow Rock is April 5 and the average first fall frost is October 29, giving a typical growing season of about 206 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 5
- Average first fall frost
- Oct 29
- Growing season
- 206 days
Safer after Apr 19 (1-in-10 risk)
Possible by Oct 16 (1-in-10 risk)
Last frost typically in 154 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 3 · Apr 16 · May 1 | Oct 4 · Oct 19 · Oct 30 | 184 days | 100% |
| Frost / freeze (32°F) | Mar 19 · Apr 5 · Apr 19 | Oct 16 · Oct 29 · Nov 11 | 206 days | 100% |
| Hard freeze (28°F) | Mar 9 · Mar 26 · Apr 9 | Oct 27 · Nov 8 · Nov 25 | 228 days | 100% |
Planting calendar for Arrow Rock
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 5 – May 11 |
| Tomatoes | Transplant outdoors | Apr 21 – Jul 9 |
| Peppers | Start seeds indoors | Mar 5 – Apr 5 |
| Peppers | Transplant outdoors | May 5 – Jun 5 |
| Eggplant | Start seeds indoors | Mar 22 – Apr 20 |
| Eggplant | Transplant outdoors | May 5 – Jun 5 |
| Cucumbers | Sow outdoors | May 5 – Jul 19 |
| Summer squash | Sow outdoors | Apr 21 – Jun 5 |
| Winter squash & pumpkins | Sow outdoors | May 5 – Jun 5 |
| Snap beans | Sow outdoors | Apr 21 – Aug 11 |
| Sweet corn | Sow outdoors | Apr 21 – Jul 9 |
| Watermelon & cantaloupe | Sow outdoors | May 5 – Jun 5 |
| Okra | Sow outdoors | Apr 28 – May 21 |
| Peas | Sow outdoors (spring) | Mar 5 – Apr 20 |
| Potatoes | Plant outdoors (spring) | Mar 5 – May 5 |
| Onions | Start seeds indoors (spring) | Jan 22 – Feb 18 |
| Onions | Transplant outdoors (spring) | Mar 22 – Apr 20 |
| Broccoli | Start seeds indoors (spring) | Feb 15 – Mar 21 |
| Broccoli | Transplant outdoors (spring) | Mar 22 – Apr 20 |
| Broccoli | Start seeds indoors (fall) | Jun 29 – Jul 9 |
| Broccoli | Transplant outdoors (fall) | Jul 29 – Aug 9 |
| Cabbage | Start seeds indoors (spring) | Feb 5 – Mar 5 |
| Cabbage | Transplant outdoors (spring) | Mar 5 – Apr 5 |
| Cabbage | Start seeds indoors (fall) | Jun 19 – Jul 19 |
| Cabbage | Transplant outdoors (fall) | Jul 19 – Aug 19 |
| Leaf lettuce | Sow outdoors (spring) | Mar 5 – May 21 |
| Leaf lettuce | Sow outdoors (fall) | Jul 19 – Sep 4 |
| Spinach | Sow outdoors (spring) | Feb 26 – Apr 11 |
| Spinach | Sow outdoors (fall) | Aug 5 – Sep 9 |
| Radishes | Sow outdoors (spring) | Mar 5 – Apr 25 |
| Radishes | Sow outdoors (fall) | Jul 19 – Sep 19 |
| Kale | Sow outdoors (spring) | Mar 22 – Apr 11 |
| Kale | Sow outdoors (fall) | Jul 12 – Aug 19 |
| Carrots | Sow outdoors (spring) | Apr 5 – May 21 |
| Carrots | Sow outdoors (fall) | Jun 19 – Aug 4 |
| Garlic | Plant outdoors (fall) | Oct 19 – Nov 19 |
Where these dates come from
ZIP code 65320 is matched to the NOAA station Boonville, MO, 19.6 km away, at 744 ft elevation (19 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Boonville, MO (used) | 744 ft | Apr 5 | Oct 29 |
| New Franklin 1W, MO | 641 ft | Apr 13 | Oct 22 |
| Boonville, MO | 752 ft | Apr 12 | Oct 25 |
| Marshall, MO | 790 ft | Apr 10 | Oct 24 |
Frost dates near Arrow Rock
- Nelson, MO 65347 · last Apr 13, first Oct 22
- Franklin, MO 65250 · last Apr 13, first Oct 22
- Blackwater, MO 65322 · last Apr 13, first Oct 22
- Slater, MO 65349 · last Apr 10, first Oct 24
- New Franklin, MO 65274 · last Apr 13, first Oct 22
- Gilliam, MO 65330 · last Apr 10, first Oct 24
- Glasgow, MO 65254 · last Apr 12, first Oct 22
- Boonville, MO 65233 · last Apr 5, first Oct 29
Frequently asked questions
- When is the last frost in Arrow Rock, MO?
- For ZIP code 65320, the average last spring frost (32°F) is April 5, based on NOAA 1991-2020 climate normals for the Boonville, MO weather station. There is a 1-in-10 chance of a frost after April 19.
- When is the first frost in Arrow Rock, MO?
- The average first fall frost (32°F) is October 29. There is a 1-in-10 chance of frost by October 16, so tender plants are at risk from that point on.
- How long is the growing season in 65320?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 206 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.