Frost dates for 72666Parthenon, AR
The average last spring frost in Parthenon is April 7 and the average first fall frost is November 4, giving a typical growing season of about 211 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 7
- Average first fall frost
- Nov 4
- Growing season
- 211 days
Safer after Apr 22 (1-in-10 risk)
Possible by Oct 21 (1-in-10 risk)
First frost typically in 2 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 18 · May 2 | Oct 11 · Oct 25 · Nov 7 | 190 days | 100% |
| Frost / freeze (32°F) | Mar 21 · Apr 7 · Apr 22 | Oct 21 · Nov 4 · Nov 19 | 211 days | 100% |
| Hard freeze (28°F) | Mar 7 · Mar 27 · Apr 11 | Oct 28 · Nov 12 · Nov 30 | 231 days | 100% |
Planting calendar for Parthenon
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 7 – May 13 |
| Tomatoes | Transplant outdoors | Apr 23 – Jul 15 |
| Peppers | Start seeds indoors | Mar 7 – Apr 7 |
| Peppers | Transplant outdoors | May 7 – Jun 7 |
| Eggplant | Start seeds indoors | Mar 24 – Apr 22 |
| Eggplant | Transplant outdoors | May 7 – Jun 7 |
| Cucumbers | Sow outdoors | May 7 – Jul 25 |
| Summer squash | Sow outdoors | Apr 23 – Jun 7 |
| Winter squash & pumpkins | Sow outdoors | May 7 – Jun 7 |
| Snap beans | Sow outdoors | Apr 23 – Aug 17 |
| Sweet corn | Sow outdoors | Apr 23 – Jul 15 |
| Watermelon & cantaloupe | Sow outdoors | May 7 – Jun 7 |
| Okra | Sow outdoors | Apr 30 – May 23 |
| Peas | Sow outdoors (spring) | Mar 7 – Apr 22 |
| Potatoes | Plant outdoors (spring) | Mar 7 – May 7 |
| Onions | Start seeds indoors (spring) | Jan 24 – Feb 20 |
| Onions | Transplant outdoors (spring) | Mar 24 – Apr 22 |
| Broccoli | Start seeds indoors (spring) | Feb 17 – Mar 23 |
| Broccoli | Transplant outdoors (spring) | Mar 24 – Apr 22 |
| Broccoli | Start seeds indoors (fall) | Jul 5 – Jul 15 |
| Broccoli | Transplant outdoors (fall) | Aug 4 – Aug 15 |
| Cabbage | Start seeds indoors (spring) | Feb 7 – Mar 7 |
| Cabbage | Transplant outdoors (spring) | Mar 7 – Apr 7 |
| Cabbage | Start seeds indoors (fall) | Jun 25 – Jul 25 |
| Cabbage | Transplant outdoors (fall) | Jul 25 – Aug 25 |
| Leaf lettuce | Sow outdoors (spring) | Mar 7 – May 23 |
| Leaf lettuce | Sow outdoors (fall) | Jul 25 – Sep 10 |
| Spinach | Sow outdoors (spring) | Feb 28 – Apr 13 |
| Spinach | Sow outdoors (fall) | Aug 11 – Sep 15 |
| Radishes | Sow outdoors (spring) | Mar 7 – Apr 27 |
| Radishes | Sow outdoors (fall) | Jul 25 – Sep 25 |
| Kale | Sow outdoors (spring) | Mar 24 – Apr 13 |
| Kale | Sow outdoors (fall) | Jul 18 – Aug 25 |
| Carrots | Sow outdoors (spring) | Apr 7 – May 23 |
| Carrots | Sow outdoors (fall) | Jun 25 – Aug 10 |
| Garlic | Plant outdoors (fall) | Oct 25 – Nov 25 |
Where these dates come from
ZIP code 72666 is matched to the NOAA station Deer, AR, 14.3 km away, at 2,375 ft elevation (534 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Deer, AR (used) | 2,375 ft | Apr 7 | Nov 4 |
| Kingston 2S, AR | 2,145 ft | Apr 13 | Oct 29 |
| Harrison, AR | 1,132 ft | Mar 22 | Nov 9 |
| Harrison Boone Co Ap, AR | 1,374 ft | Apr 3 | Oct 30 |
Frost dates near Parthenon
- Jasper, AR 72641 · last Mar 22, first Nov 9
- Deer, AR 72628 · last Apr 7, first Nov 4
- Ponca, AR 72670 · last Apr 3, first Oct 30
- Marble Falls, AR 72648 · last Mar 22, first Nov 9
- Vendor, AR 72683 · last Apr 14, first Oct 22
- Compton, AR 72624 · last Apr 13, first Oct 29
- Mount Judea, AR 72655 · last Apr 11, first Oct 26
- Hasty, AR 72640 · last Apr 3, first Oct 30
Frequently asked questions
- When is the last frost in Parthenon, AR?
- For ZIP code 72666, the average last spring frost (32°F) is April 7, based on NOAA 1991-2020 climate normals for the Deer, AR weather station. There is a 1-in-10 chance of a frost after April 22.
- When is the first frost in Parthenon, AR?
- The average first fall frost (32°F) is November 4. There is a 1-in-10 chance of frost by October 21, so tender plants are at risk from that point on.
- How long is the growing season in 72666?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 211 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.