Conroe, TX planting zone & frost dates
Conroe is in USDA hardiness zone 9a. The last spring frost usually comes around February 24 and the first fall frost around December 2, for a growing season of about 285 days.
Planting calendar for Conroe
Dates are counted from the average last spring frost (February 24) 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: Dec 30 – Jan 13 Transplant outdoors: Mar 3 – Mar 10 |
| Peppers | Start seeds indoors: Dec 16 – Dec 30 Transplant outdoors: Mar 10 – Mar 17 |
| Eggplant | Start seeds indoors: Dec 16 – Dec 30 Transplant outdoors: Mar 10 – Mar 17 |
| Broccoli | Start seeds indoors: Dec 16 – Dec 30 Transplant outdoors: Jan 27 – Feb 10 |
| Cabbage | Start seeds indoors: Dec 16 – Dec 30 Transplant outdoors: Jan 27 – Feb 10 |
| Onions (sets) | Plant outdoors: Jan 27 – Feb 10 |
| Peas | Sow outdoors: Jan 13 – Jan 27 |
| Spinach | Sow outdoors: Jan 13 – Jan 27 |
| Lettuce | Sow outdoors: Jan 27 – Feb 10 |
| Carrots | Sow outdoors: Jan 27 – Feb 10 |
| Potatoes | Plant outdoors: Jan 27 – Feb 10 |
| Beans | Sow outdoors: Mar 3 – Mar 10 |
| Sweet corn | Sow outdoors: Mar 3 – Mar 10 |
| Cucumbers | Sow outdoors: Mar 3 – Mar 10 |
| Squash & zucchini | Sow outdoors: Mar 3 – Mar 10 |
| Basil | Start seeds indoors: Jan 13 – Jan 27 Transplant outdoors: Mar 3 – Mar 10 |
Fall garden: cool-season crops like lettuce, spinach and kale can be sown again around Oct 7 (8 weeks before the average first fall frost on Dec 2).
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
As an Amazon Associate, FrostZoneMap earns from qualifying purchases, at no extra cost to you.
Frost risk in detail
| 90% chance | 50% chance | 10% chance | |
|---|---|---|---|
| Last 32°F frost in spring is after | Jan 26 | Feb 24 | Mar 17 |
| First 32°F frost in fall is before | Jan 2 | Dec 2 | Nov 11 |
How to read it: in spring there is a 10% chance of a frost after March 17, so that is a safe date for tender plants. In fall there is a 10% chance of frost before November 11. A hard freeze (28°F) usually ends around February 2.
Hardiness zone by ZIP code in Conroe
- 77301 zone 9a
- 77302 zone 9a
- 77303 zone 9a
- 77304 zone 9a
- 77305 zone 9a
- 77306 zone 9a
- 77384 zone 9a
- 77385 zone 9a
Nearby cities
- The Woodlands zone 9a, last frost Feb 19
- Spring zone 9b, last frost Feb 13
- Tomball zone 9b, last frost Feb 19
- New Caney zone 9a, last frost Feb 13
- Humble zone 9b, last frost Feb 13
- Cypress zone 9b, last frost Feb 19
- Huntsville zone 9a, last frost Mar 1
- Houston zone 9b, last frost Feb 2
Questions
What growing zone is Conroe, TX?
Conroe 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 Conroe?
The average last spring frost (32°F) in Conroe is February 24. There is still a 10% chance of frost until March 17.
When can I plant tomatoes in Conroe?
Transplant tomatoes outdoors 1–2 weeks after the average last frost: around Mar 3 – Mar 10. Start seeds indoors 6–8 weeks before the last frost.
Frost dates: NOAA U.S. Climate Normals 1991–2020, station Conroe, TX (USC00411956), 3.3 km (2.0 mi) from the city center, elevation 75 m, based on 29 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.