Seguin, TX planting zone & frost dates
Seguin is in USDA hardiness zone 9a. The last spring frost usually comes around March 1 and the first fall frost around November 26, for a growing season of about 273 days.
Planting calendar for Seguin
Dates are counted from the average last spring frost (March 1) 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 4 – Jan 18 Transplant outdoors: Mar 8 – Mar 15 |
| Peppers | Start seeds indoors: Dec 21 – Jan 4 Transplant outdoors: Mar 15 – Mar 22 |
| Eggplant | Start seeds indoors: Dec 21 – Jan 4 Transplant outdoors: Mar 15 – Mar 22 |
| Broccoli | Start seeds indoors: Dec 21 – Jan 4 Transplant outdoors: Feb 1 – Feb 15 |
| Cabbage | Start seeds indoors: Dec 21 – Jan 4 Transplant outdoors: Feb 1 – Feb 15 |
| Onions (sets) | Plant outdoors: Feb 1 – Feb 15 |
| Peas | Sow outdoors: Jan 18 – Feb 1 |
| Spinach | Sow outdoors: Jan 18 – Feb 1 |
| Lettuce | Sow outdoors: Feb 1 – Feb 15 |
| Carrots | Sow outdoors: Feb 1 – Feb 15 |
| Potatoes | Plant outdoors: Feb 1 – Feb 15 |
| Beans | Sow outdoors: Mar 8 – Mar 15 |
| Sweet corn | Sow outdoors: Mar 8 – Mar 15 |
| Cucumbers | Sow outdoors: Mar 8 – Mar 15 |
| Squash & zucchini | Sow outdoors: Mar 8 – Mar 15 |
| Basil | Start seeds indoors: Jan 18 – Feb 1 Transplant outdoors: Mar 8 – Mar 15 |
Fall garden: cool-season crops like lettuce, spinach and kale can be sown again around Oct 1 (8 weeks before the average first fall frost on Nov 26).
Useful for zone 9a 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
- Shade cloth — for hot summers
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Frost risk in detail
| 90% chance | 50% chance | 10% chance | |
|---|---|---|---|
| Last 32°F frost in spring is after | Feb 3 | Mar 1 | Mar 20 |
| First 32°F frost in fall is before | Dec 20 | Nov 26 | Nov 8 |
How to read it: in spring there is a 10% chance of a frost after March 20, so that is a safe date for tender plants. In fall there is a 10% chance of frost before November 8. A hard freeze (28°F) usually ends around February 13.
Hardiness zone by ZIP code in Seguin
- 78155 zone 9a
- 78156 zone 9a
Nearby cities
- New Braunfels zone 9a, last frost Mar 8
- Cibolo zone 9a, last frost Feb 21
- Schertz zone 9a, last frost Feb 21
- San Marcos zone 9a, last frost Feb 28
- Universal City zone 9a, last frost Feb 21
- Converse zone 9a, last frost Feb 21
- Live Oak zone 9a, last frost Feb 21
- Canyon Lake zone 9a, last frost Mar 1
Questions
What growing zone is Seguin, TX?
Seguin is in USDA Plant Hardiness Zone 9a (average extreme winter low 20°F to 25°F), according to the USDA 2023 map.
When is the last frost in Seguin?
The average last spring frost (32°F) in Seguin is March 1. There is still a 10% chance of frost until March 20.
When can I plant tomatoes in Seguin?
Transplant tomatoes outdoors 1–2 weeks after the average last frost: around Mar 8 – Mar 15. Start seeds indoors 6–8 weeks before the last frost.
Frost dates: NOAA U.S. Climate Normals 1991–2020, station Austin San Antonio, TX (USW00012971), 16.2 km (10.1 mi) from the city center, elevation 193 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.