Duncanville, TX planting zone & frost dates
Duncanville is in USDA hardiness zone 8b. The last spring frost usually comes around March 6 and the first fall frost around November 25, for a growing season of about 265 days.
Planting calendar for Duncanville
Dates are counted from the average last spring frost (March 6) 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 9 – Jan 23 Transplant outdoors: Mar 13 – Mar 20 |
| Peppers | Start seeds indoors: Dec 26 – Jan 9 Transplant outdoors: Mar 20 – Mar 27 |
| Eggplant | Start seeds indoors: Dec 26 – Jan 9 Transplant outdoors: Mar 20 – Mar 27 |
| Broccoli | Start seeds indoors: Dec 26 – Jan 9 Transplant outdoors: Feb 6 – Feb 20 |
| Cabbage | Start seeds indoors: Dec 26 – Jan 9 Transplant outdoors: Feb 6 – Feb 20 |
| Onions (sets) | Plant outdoors: Feb 6 – Feb 20 |
| Peas | Sow outdoors: Jan 23 – Feb 6 |
| Spinach | Sow outdoors: Jan 23 – Feb 6 |
| Lettuce | Sow outdoors: Feb 6 – Feb 20 |
| Carrots | Sow outdoors: Feb 6 – Feb 20 |
| Potatoes | Plant outdoors: Feb 6 – Feb 20 |
| Beans | Sow outdoors: Mar 13 – Mar 20 |
| Sweet corn | Sow outdoors: Mar 13 – Mar 20 |
| Cucumbers | Sow outdoors: Mar 13 – Mar 20 |
| Squash & zucchini | Sow outdoors: Mar 13 – Mar 20 |
| Basil | Start seeds indoors: Jan 23 – Feb 6 Transplant outdoors: Mar 13 – Mar 20 |
Fall garden: cool-season crops like lettuce, spinach and kale can be sown again around Sep 30 (8 weeks before the average first fall frost on Nov 25).
Useful for zone 8b 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 | Feb 15 | Mar 6 | Mar 26 |
| First 32°F frost in fall is before | Dec 14 | Nov 25 | Nov 6 |
How to read it: in spring there is a 10% chance of a frost after March 26, so that is a safe date for tender plants. In fall there is a 10% chance of frost before November 6. A hard freeze (28°F) usually ends around February 22.
Hardiness zone by ZIP code in Duncanville
- 75116 zone 8b
- 75137 zone 8b
- 75138 zone 8b
Nearby cities
- Cedar Hill zone 8b, last frost Mar 20
- DeSoto zone 8b, last frost Mar 6
- Glenn Heights zone 8b, last frost Mar 16
- Grand Prairie zone 8b, last frost Mar 9
- Lancaster zone 8b, last frost Mar 12
- Dallas zone 8b, last frost Mar 2
- Irving zone 8b, last frost Mar 2
- Red Oak zone 8b, last frost Mar 16
Questions
What growing zone is Duncanville, TX?
Duncanville is in USDA Plant Hardiness Zone 8b (average extreme winter low 15°F to 20°F), according to the USDA 2023 map.
When is the last frost in Duncanville?
The average last spring frost (32°F) in Duncanville is March 6. There is still a 10% chance of frost until March 26.
When can I plant tomatoes in Duncanville?
Transplant tomatoes outdoors 1–2 weeks after the average last frost: around Mar 13 – Mar 20. Start seeds indoors 6–8 weeks before the last frost.
Frost dates: NOAA U.S. Climate Normals 1991–2020, station Dallas Redbird Ap, TX (USW00003971), 5.0 km (3.1 mi) from the city center, elevation 201 m, based on 20 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.