Conroe, Texas planting calendar and frost dates
Conroe is in USDA hardiness zone 9a. The last spring frost typically comes around February 24 and the first fall frost around December 2, giving about 285 frost-free days a year.
- Hardiness zone
- Zone 9a
- Typical last frost
- February 24
- Typical first frost
- December 2
- Frost-free season
- 285 days
Frost dates in Conroe
Last spring frost
- January 26Risky: frost later than this in 9 years out of 10
- February 24Typical: a later frost in half of years
- March 17Safe: a later frost only 1 year in 10
First fall frost
- November 11Risky: frost earlier than this 1 year in 10
- December 2Typical: an earlier frost in half of years
- New yearLate: in about 1 year in 10, the first frost waits until after December 31
The growing season between the typical last and first frosts is about 285 days. Frost here means a low of 32°F at the weather station. A hard freeze (28°F), which damages most hardy crops too, typically ends around February 2 and returns around December 23.
NOAA U.S. Climate Normals 1991-2020 for Conroe, 2 miles NW of the city center. Low-lying and rural spots often frost later in spring and earlier in fall than airports and city centers.
What to plant each month in Conroe
January
Start indoors: basil, black-eyed susans, cabbages, cantaloupes, cauliflower, celery, chives, cilantro, collard greens, eggplants, ginger, lettuce, marigolds, nasturtiums, peppers, ranunculus, sage, snapdragons, spinach, swiss chard, tomatoes, watermelons
Plant or sow outdoors: asparagus, beets, black-eyed susans, blackberries, blueberries, broccoli, cauliflower, chives, cilantro, collard greens, figs, garlic, gladioli, grapes, grass seed, green onions, hollyhocks, kale, leeks, onions, peas, poppies, radishes, ranunculus, raspberries, rhubarb, roses, spinach, strawberries, swiss chard, turnips, wildflowers
February
Start indoors: cantaloupes, cosmos, cucumbers, okra, pumpkins, ranunculus, watermelons, winter squash, zucchini
Plant or sow outdoors: asparagus, beets, black-eyed susans, blackberries, broccoli, cabbages, carrots, cauliflower, chives, cilantro, collard greens, dahlias, dill, figs, garden mums, gladioli, grapes, green onions, kentucky bluegrass, lavenders, leeks, lettuce, lilies, marigolds, mints, nasturtiums, onions, oregano, parsley, petunias, potatoes, radishes, ranunculus, rosemary, roses, sage, snapdragons, spinach, sunflowers, sweet corn, sweet peas, swiss chard, tall fescue, thyme, turnips
March
Start indoors: zinnias
Plant or sow outdoors: basil, bermudagrass, cantaloupes, celery, centipedegrass, chives, cilantro, cosmos, cucumbers, dahlias, dill, eggplants, garden mums, ginger, gladioli, grapes, green beans, green onions, lavenders, lettuce, lilies, marigolds, mints, nasturtiums, okra, oregano, parsley, peanuts, peppers, petunias, pumpkins, ranunculus, rosemary, sage, spinach, st. augustinegrass, sunflowers, sweet corn, sweet potatoes, swiss chard, thyme, tomatoes, watermelons, winter squash, zoysiagrass, zucchini
April
Plant or sow outdoors: bermudagrass, celery, centipedegrass, cosmos, okra, peanuts, st. augustinegrass, sweet potatoes, zinnias, zoysiagrass
May
Plant or sow outdoors: bermudagrass, centipedegrass, st. augustinegrass, zinnias, zoysiagrass
August
Plant for fall: brussels sprouts, peppers, potatoes, sweet corn, tomatoes
September
Plant for fall: bearded irises, beets, broccoli, brussels sprouts, cabbages, carrots, cauliflower, collard greens, cucumbers, daylilies, green beans, kale, lettuce, peas, peppers, radishes, snapdragons, spinach, sweet corn, swiss chard, turnips, zucchini
October
Plant for fall: azaleas, bearded irises, beets, broccoli, cabbages, cauliflower, clematis, coneflowers, crocuses, daffodils, daylilies, grass seed, hostas, hydrangeas, kale, kentucky bluegrass, lettuce, lilies, ornamental alliums, peonies, perennial ryegrass, radishes, roses, saffron, snapdragons, spinach, tall fescue, tulips, turnips
November
Start indoors: onions
Plant for fall: crocuses, daffodils, daylilies, grass seed, hostas, hyacinths, kale, kentucky bluegrass, lilies, ornamental alliums, peonies, perennial ryegrass, radishes, saffron, tall fescue, tulips
December
Start indoors: black-eyed susans, broccoli, cabbages, cauliflower, chives, collard greens, ginger, kale, leeks, lettuce, marigolds, onions, oregano, parsley, peppers, petunias, ranunculus, rosemary, sage, snapdragons
Plant for fall: crocuses, daffodils, garlic, hyacinths, lilies, ornamental alliums, peonies, tulips
Frost dates and zones by ZIP code in Conroe
All 6 of Conroe's main ZIP codes take their frost dates from Conroe, so the dates on this page apply across the city. Every one of them is in zone 9a.
Planting dates for popular crops in Conroe
| Plant | Start indoors | Plant or sow outdoors | Fall planting |
|---|---|---|---|
| Tomatoes | Jan 8 to 22 | Mar 5 to 19 | Aug 19 to 26 |
| Strawberries | — | Jan 13 to 27 | — |
| Lettuce | Dec 30 to Jan 13 | Feb 17 to Mar 3 | Sep 2 to Oct 7 |
| Cilantro | Jan 13 to 27 | Feb 24 to Mar 3 | — |
| Basil | Jan 15 to 29 | Mar 5 to 12 | — |
| Potatoes | — | Feb 3 to 10 | Aug 12 to 19 |
| Garlic | — | Jan 13 to 27 | Dec 2 to 16 |
| Onions | Nov 4 to Dec 16 | Jan 27 to Feb 10 | — |
| Cucumbers | Feb 5 to 19 | Mar 5 to 19 | Sep 2 to 16 |
| Pumpkins | Feb 10 to 24 | Mar 10 to 24 | — |
| Peppers | Dec 18 to Jan 15 | Mar 5 to 19 | Aug 12 to Sep 9 |
| Carrots | — | Feb 3 to 24 | Sep 9 to 30 |
| Sweet Potatoes | — | Mar 26 to Apr 2 | — |
| Watermelons | Jan 29 to Feb 12 | Mar 5 to 19 | — |
| Sweet Corn | — | Feb 24 to Mar 10 | Aug 26 to Sep 9 |
| Green Beans | — | Mar 5 to 19 | Sep 9 to 16 |
| Zucchini | Feb 5 to 19 | Mar 5 to 19 | Sep 9 to 23 |
| Broccoli | Dec 9 to 30 | Jan 27 to Feb 10 | Sep 16 to Oct 14 |
| Peas | — | Jan 13 to 27 | Sep 9 to 23 |
| Spinach | Jan 13 to 20 | Feb 17 to Mar 3 | Sep 23 to Oct 28 |
| Sunflowers | — | Feb 24 to Mar 17 | — |
| Zinnias | Mar 23 to 30 | Apr 20 to May 4 | — |
| Tulips | — | — | Oct 21 to Dec 16 |
| Daffodils | — | — | Oct 21 to Dec 2 |
| Grass Seed | — | Jan 13 to 27 | Oct 21 to Nov 4 |
Nearby cities
- Houston, TX zone 9b, last frost Jan 30
- Baytown, TX zone 9b, last frost Feb 20
- Fulshear, TX zone 9a, last frost Jan 30
- Pasadena, TX zone 9b, last frost Jan 30
- College Station, TX zone 9a, last frost Feb 27
- Sugar Land, TX zone 9b, last frost Feb 2
Planting in TexasAbout zone 9aPrintable calendar for Conroe
Questions
When is the last frost in Conroe?
Around February 24 in a typical year, based on NOAA's 1991-2020 records for Conroe. There is still a 1 in 10 chance of frost after March 17.
What planting zone is Conroe in?
USDA hardiness zone 9a (2023 map). The zone tells you which perennials survive the winter; planting dates depend on frost dates instead.
When should I plant tomatoes in Conroe?
Start seeds indoors January 8 to 22 and set plants out March 5 to 19; the safest date to plant out is after March 17.
When is the first frost in Conroe?
Around December 2 in a typical year, and before November 11 about 1 year in 10.