Brenham, TX planting zone & frost dates
Brenham is in USDA hardiness zone 9a. The last spring frost usually comes around March 2 and the first fall frost around November 30, for a growing season of about 273 days.
Planting calendar for Brenham
Dates are counted from the average last spring frost (March 2) 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 5 – Jan 19 Transplant outdoors: Mar 9 – Mar 16 |
| Peppers | Start seeds indoors: Dec 22 – Jan 5 Transplant outdoors: Mar 16 – Mar 23 |
| Eggplant | Start seeds indoors: Dec 22 – Jan 5 Transplant outdoors: Mar 16 – Mar 23 |
| Broccoli | Start seeds indoors: Dec 22 – Jan 5 Transplant outdoors: Feb 2 – Feb 16 |
| Cabbage | Start seeds indoors: Dec 22 – Jan 5 Transplant outdoors: Feb 2 – Feb 16 |
| Onions (sets) | Plant outdoors: Feb 2 – Feb 16 |
| Peas | Sow outdoors: Jan 19 – Feb 2 |
| Spinach | Sow outdoors: Jan 19 – Feb 2 |
| Lettuce | Sow outdoors: Feb 2 – Feb 16 |
| Carrots | Sow outdoors: Feb 2 – Feb 16 |
| Potatoes | Plant outdoors: Feb 2 – Feb 16 |
| Beans | Sow outdoors: Mar 9 – Mar 16 |
| Sweet corn | Sow outdoors: Mar 9 – Mar 16 |
| Cucumbers | Sow outdoors: Mar 9 – Mar 16 |
| Squash & zucchini | Sow outdoors: Mar 9 – Mar 16 |
| Basil | Start seeds indoors: Jan 19 – Feb 2 Transplant outdoors: Mar 9 – Mar 16 |
Fall garden: cool-season crops like lettuce, spinach and kale can be sown again around Oct 5 (8 weeks before the average first fall frost on Nov 30).
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 | Jan 31 | Mar 2 | Mar 20 |
| First 32°F frost in fall is before | Dec 23 | Nov 30 | 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 10.
Hardiness zone by ZIP code in Brenham
- 77833 zone 9a
- 77834 zone 9a
Nearby cities
- College Station zone 9a, last frost Feb 27
- Bryan zone 9a, last frost Feb 27
- Katy zone 9b, last frost Feb 2
- Cypress zone 9b, last frost Feb 19
- Cinco Ranch zone 9b, last frost Feb 2
- Tomball zone 9b, last frost Feb 19
- Rosenberg zone 9a, last frost Feb 9
- Pecan Grove zone 9b, last frost Feb 9
Questions
What growing zone is Brenham, TX?
Brenham 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 Brenham?
The average last spring frost (32°F) in Brenham is March 2. There is still a 10% chance of frost until March 20.
When can I plant tomatoes in Brenham?
Transplant tomatoes outdoors 1–2 weeks after the average last frost: around Mar 9 – Mar 16. Start seeds indoors 6–8 weeks before the last frost.
Frost dates: NOAA U.S. Climate Normals 1991–2020, station Brenham, TX (USC00411048), 0.9 km (0.6 mi) from the city center, elevation 95 m, based on 28 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.