USDA Hardiness Zone 9a
Frost Dates for 77301 — Conroe, Texas
Averages from Conroe, Tx US, the nearest reporting station, 2.3 miles away.
Plant tender crops after February 24, and expect the first autumn freeze around December 2. That leaves about 285 frost-free days.
- Last spring frost
- February 24
- First fall frost
- December 2
- Growing season
- 285 days
- Hardiness zone
- 9a
50% probability
50% probability
frost-free
20 to 25°F annual low
Planting calendar for 77301
| When | What to do |
|---|---|
| December 16 – December 30 | Start peppers and aubergines indoors They need eight to ten weeks under lights before they can go out. |
| December 30 – January 13 | Start tomatoes indoors Six to eight weeks gives a transplant big enough to set fruit early. |
| January 27 – February 10 | Sow peas, spinach, lettuce, radish outdoors These tolerate light frost and prefer to germinate in cool soil. |
| February 24 onward | Transplant tomatoes, peppers, basil, squash, cucumbers The average last freeze has passed — still watch the actual forecast. |
| by September 9 | Sow the autumn crop of carrots, beets and brassicas They need about twelve weeks to size up before growth stops. |
| by November 18 | Harvest tender crops, or be ready to cover them A first freeze two weeks early is well within normal variation. |
| December 2 onward | Plant garlic, mulch beds, lift tender bulbs Garlic wants a cold spell; bare soil loses structure over winter. |
What these dates mean
Wait until after February 24 to put tender plants — tomatoes, peppers, basil, squash — in the ground. That is the date by which half of years in Conroe, Texas are past their last freeze. Harvest before December 2, which leaves roughly 285 frost-free days.
ZIP 77301 sits in USDA hardiness zone 9a, meaning the average coldest night of the year falls between 20 to 25°F. Zone decides what survives the winter; frost dates decide when to plant each spring. They are different questions, and a plant can pass one and fail the other.
These are thirty-year NOAA averages for 1991–2020, not a forecast. Any individual year can frost two to three weeks either side of these dates, so check the actual forecast before planting out.