Frost dates for 72602Harrison, AR
The average last spring frost in Harrison is April 3 and the average first fall frost is October 30, giving a typical growing season of about 210 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 3
- Average first fall frost
- Oct 30
- Growing season
- 210 days
Safer after Apr 21 (1-in-10 risk)
Possible by Oct 16 (1-in-10 risk)
First frost typically in 5 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) | Mar 30 · Apr 15 · May 2 | Oct 7 · Oct 21 · Nov 2 | 186 days | 100% |
| Frost / freeze (32°F) | Mar 17 · Apr 3 · Apr 21 | Oct 16 · Oct 30 · Nov 14 | 210 days | 100% |
| Hard freeze (28°F) | Mar 4 · Mar 24 · Apr 9 | Oct 27 · Nov 10 · Nov 30 | 232 days | 100% |
Planting calendar for Harrison
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 3 – May 9 |
| Tomatoes | Transplant outdoors | Apr 19 – Jul 10 |
| Peppers | Start seeds indoors | Mar 3 – Apr 3 |
| Peppers | Transplant outdoors | May 3 – Jun 3 |
| Eggplant | Start seeds indoors | Mar 20 – Apr 18 |
| Eggplant | Transplant outdoors | May 3 – Jun 3 |
| Cucumbers | Sow outdoors | May 3 – Jul 20 |
| Summer squash | Sow outdoors | Apr 19 – Jun 3 |
| Winter squash & pumpkins | Sow outdoors | May 3 – Jun 3 |
| Snap beans | Sow outdoors | Apr 19 – Aug 12 |
| Sweet corn | Sow outdoors | Apr 19 – Jul 10 |
| Watermelon & cantaloupe | Sow outdoors | May 3 – Jun 3 |
| Okra | Sow outdoors | Apr 26 – May 19 |
| Peas | Sow outdoors (spring) | Mar 3 – Apr 18 |
| Potatoes | Plant outdoors (spring) | Mar 3 – May 3 |
| Onions | Start seeds indoors (spring) | Jan 20 – Feb 16 |
| Onions | Transplant outdoors (spring) | Mar 20 – Apr 18 |
| Broccoli | Start seeds indoors (spring) | Feb 13 – Mar 19 |
| Broccoli | Transplant outdoors (spring) | Mar 20 – Apr 18 |
| Broccoli | Start seeds indoors (fall) | Jun 30 – Jul 10 |
| Broccoli | Transplant outdoors (fall) | Jul 30 – Aug 10 |
| Cabbage | Start seeds indoors (spring) | Feb 3 – Mar 3 |
| Cabbage | Transplant outdoors (spring) | Mar 3 – Apr 3 |
| Cabbage | Start seeds indoors (fall) | Jun 20 – Jul 20 |
| Cabbage | Transplant outdoors (fall) | Jul 20 – Aug 20 |
| Leaf lettuce | Sow outdoors (spring) | Mar 3 – May 19 |
| Leaf lettuce | Sow outdoors (fall) | Jul 20 – Sep 5 |
| Spinach | Sow outdoors (spring) | Feb 24 – Apr 9 |
| Spinach | Sow outdoors (fall) | Aug 6 – Sep 10 |
| Radishes | Sow outdoors (spring) | Mar 3 – Apr 23 |
| Radishes | Sow outdoors (fall) | Jul 20 – Sep 20 |
| Kale | Sow outdoors (spring) | Mar 20 – Apr 9 |
| Kale | Sow outdoors (fall) | Jul 13 – Aug 20 |
| Carrots | Sow outdoors (spring) | Apr 3 – May 19 |
| Carrots | Sow outdoors (fall) | Jun 20 – Aug 5 |
| Garlic | Plant outdoors (fall) | Oct 20 – Nov 20 |
Where these dates come from
ZIP code 72602 is matched to the NOAA station Harrison Boone Co Ap, AR, 6 km away, at 1,374 ft elevation (327 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Harrison Boone Co Ap, AR (used) | 1,374 ft | Apr 3 | Oct 30 |
| Harrison, AR | 1,132 ft | Mar 22 | Nov 9 |
| Lead Hill, AR | 830 ft | Apr 15 | Oct 22 |
| Branson Ap, MO | 1,286 ft | Apr 8 | Nov 2 |
Frost dates near Harrison
- Harrison, AR 72601 · last Apr 3, first Oct 30
- Bergman, AR 72615 · last Apr 3, first Oct 30
- Alpena, AR 72611 · last Apr 3, first Oct 30
- Marble Falls, AR 72648 · last Mar 22, first Nov 9
- Everton, AR 72633 · last Apr 15, first Oct 22
- Lead Hill, AR 72644 · last Apr 15, first Oct 22
- Western Grove, AR 72685 · last Apr 3, first Oct 30
- Compton, AR 72624 · last Apr 13, first Oct 29
Frequently asked questions
- When is the last frost in Harrison, AR?
- For ZIP code 72602, the average last spring frost (32°F) is April 3, based on NOAA 1991-2020 climate normals for the Harrison Boone Co Ap, AR weather station. There is a 1-in-10 chance of a frost after April 21.
- When is the first frost in Harrison, AR?
- The average first fall frost (32°F) is October 30. 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 72602?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 210 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.