Harrison, AR planting zone & frost dates
Harrison is in USDA hardiness zone 7b. The last spring frost usually comes around March 22 and the first fall frost around November 9, for a growing season of about 231 days.
Planting calendar for Harrison
Dates are counted from the average last spring frost (March 22) using the typical timing recommended by U.S. extension services. Warm-season crops go out only after the danger of frost has passed and the soil has warmed.
| Crop | When |
|---|---|
| Tomatoes | Start seeds indoors: Jan 25 – Feb 8 Transplant outdoors: Mar 29 – Apr 5 |
| Peppers | Start seeds indoors: Jan 11 – Jan 25 Transplant outdoors: Apr 5 – Apr 12 |
| Eggplant | Start seeds indoors: Jan 11 – Jan 25 Transplant outdoors: Apr 5 – Apr 12 |
| Broccoli | Start seeds indoors: Jan 11 – Jan 25 Transplant outdoors: Feb 22 – Mar 8 |
| Cabbage | Start seeds indoors: Jan 11 – Jan 25 Transplant outdoors: Feb 22 – Mar 8 |
| Onions (sets) | Plant outdoors: Feb 22 – Mar 8 |
| Peas | Sow outdoors: Feb 8 – Feb 22 |
| Spinach | Sow outdoors: Feb 8 – Feb 22 |
| Lettuce | Sow outdoors: Feb 22 – Mar 8 |
| Carrots | Sow outdoors: Feb 22 – Mar 8 |
| Potatoes | Plant outdoors: Feb 22 – Mar 8 |
| Beans | Sow outdoors: Mar 29 – Apr 5 |
| Sweet corn | Sow outdoors: Mar 29 – Apr 5 |
| Cucumbers | Sow outdoors: Mar 29 – Apr 5 |
| Squash & zucchini | Sow outdoors: Mar 29 – Apr 5 |
| Basil | Start seeds indoors: Feb 8 – Feb 22 Transplant outdoors: Mar 29 – Apr 5 |
Fall garden: cool-season crops like lettuce, spinach and kale can be sown again around Sep 14 (8 weeks before the average first fall frost on Nov 9).
Useful for zone 7b gardens
- Seed starting kit with dome — to start seeds indoors before the last frost
- LED grow light for seedlings — stops leggy seedlings
- Frost cloth / plant covers — for late spring and early fall frosts
- Soil thermometer — warm-season crops need soil above 60°F
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Frost risk in detail
| 90% chance | 50% chance | 10% chance | |
|---|---|---|---|
| Last 32°F frost in spring is after | Mar 1 | Mar 22 | Apr 8 |
| First 32°F frost in fall is before | Nov 28 | Nov 9 | Oct 25 |
How to read it: in spring there is a 10% chance of a frost after April 8, so that is a safe date for tender plants. In fall there is a 10% chance of frost before October 25. A hard freeze (28°F) usually ends around March 7.
Hardiness zone by ZIP code in Harrison
- 72601 zone 7b
- 72602 zone 7b
Nearby cities
- Mountain Home zone 7b, last frost Mar 31
- Russellville zone 8a, last frost Mar 29
- Rogers zone 7a, last frost Apr 12
- Springdale zone 7a, last frost Apr 4
- Fayetteville zone 7a, last frost Apr 4
- Bentonville zone 7a, last frost Apr 12
- Centerton zone 7a, last frost Apr 12
- Bella Vista zone 7a, last frost Apr 5
Questions
What growing zone is Harrison, AR?
Harrison is in USDA Plant Hardiness Zone 7b (average extreme winter low 5°F to 10°F), according to the USDA 2023 map.
When is the last frost in Harrison?
The average last spring frost (32°F) in Harrison is March 22. There is still a 10% chance of frost until April 8.
When can I plant tomatoes in Harrison?
Transplant tomatoes outdoors 1–2 weeks after the average last frost: around Mar 29 – Apr 5. Start seeds indoors 6–8 weeks before the last frost.
Frost dates: NOAA U.S. Climate Normals 1991–2020, station Harrison, AR (USC00033164), 3.8 km (2.4 mi) from the city center, elevation 345 m, based on 5 years of records. Hardiness zone: USDA Plant Hardiness Zone Map 2023 for the ZIP code nearest to the city center. Microclimates (valleys, hills, cities, coasts) can be warmer or colder: check the local forecast before planting. How we calculate the data.