Frost Dates & Planting Calendar for Cibolo, TX
Plan your garden around Cibolo, TX's typical frost-free growing season, using NOAA climate normals and a 42-crop planting calendar built for this location.
Last Spring Frost
February 21
Safe Mar 14
Typical Feb 21
Risky Jan 10
First Fall Frost
December 5
Safe Nov 16
Typical Dec 5
Risky Jan 1
Growing Season
289 days
Typical last frost to typical first frost.
USDA Hardiness Zone
Zone 9a
Subtropical to frost-free — heat, not cold, is the main limit on what you can grow.
Data: NOAA station RANDOLPH AFB, TX US, 4.9 km away.
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days until the typical last spring frost
Monthly Temperatures
Avg. high
Avg. temp
Avg. low
Planting Calendar
| Crop | Start indoors | Direct sow | Transplant | Fall planting | Maturity | Notes |
|---|---|---|---|---|---|---|
| Tomato | Dec 27 – Jan 10 | — | Feb 28 – Mar 7 | — | 60–85 days | Start indoors 6-8 weeks before last frost; transplant out 1-2 weeks after last frost once soil has warmed. |
| Pepper | Dec 13 – Dec 27 | — | Feb 28 – Mar 14 | — | 60–90 days | Slow to germinate; start indoors 8-10 weeks before last frost. Transplant only once nights stay above 55F, 1-3 weeks after last frost. |
| Eggplant | Dec 13 – Dec 27 | — | Mar 7 – Mar 14 | — | 65–85 days | Warm-season crop, similar timing to pepper; needs consistently warm soil (65F+) to transplant. |
| Cucumber | Jan 24 – Jan 31 | Feb 28 – Mar 7 | Feb 28 – Mar 7 | — | 50–65 days | Can be started indoors 3-4 weeks before transplanting, or direct-sown 1-2 weeks after last frost once soil is warm. |
| Zucchini | Jan 31 – Feb 7 | Feb 28 – Mar 14 | Feb 28 – Mar 7 | — | 45–55 days | Fast-growing squash; direct sow 1-3 weeks after last frost, or start indoors 2-3 weeks early for a head start. |
| Winter Squash | Jan 24 – Jan 31 | Feb 28 – Mar 14 | Feb 28 – Mar 7 | — | 80–110 days | Long season; direct sow after soil warms, or start indoors 3-4 weeks before last frost in short-season climates. |
| Pumpkin | — | Feb 28 – Mar 14 | — | — | 90–120 days | Direct sow 1-3 weeks after last frost; back-time from your first fall frost so the 90-120 day maturity window lands before it. |
| Watermelon | Jan 24 – Jan 31 | — | Mar 7 – Mar 14 | — | 70–90 days | Needs warm soil (65F+); start indoors 3-4 weeks before last frost, transplant 2-3 weeks after last frost. |
| Cantaloupe | Jan 24 – Jan 31 | — | Mar 7 – Mar 14 | — | 70–90 days | Same warm-soil requirements as watermelon; avoid disturbing roots when transplanting. |
| Corn | — | Feb 21 – Mar 7 | — | — | 60–100 days | Direct sow at last frost to 2 weeks after, once soil reaches 60F; does not transplant well. Succession sow every 2 weeks. |
| Green Bean | — | Feb 21 – Mar 7 | — | — | 50–65 days | Direct sow at last frost to 2 weeks after, once soil has warmed; frost-tender, do not rush. |
| Pea | — | Jan 10 – Jan 24 | — | — | 55–70 days | Cold-hardy; direct sow 4-6 weeks before last frost as soon as soil can be worked. |
| Lettuce | — | Jan 24 – Feb 7 | — | Oct 10 – Oct 24 | 45–60 days | Cold-hardy; direct sow 2-4 weeks before last frost. Also transplantable from indoor starts. |
| Spinach | — | Jan 10 – Jan 24 | — | Oct 10 – Oct 24 | 40–50 days | Very cold-hardy; direct sow 4-6 weeks before last frost as soon as soil can be worked. |
| Kale | — | Jan 24 – Feb 7 | — | Sep 26 – Oct 10 | 50–65 days | Cold-hardy; direct sow 2-4 weeks before last frost or start indoors for earlier transplants. |
| Arugula | — | Jan 24 – Feb 7 | — | Oct 24 – Oct 31 | 30–40 days | Fast-growing, cold-tolerant green; direct sow 2-4 weeks before last frost, succession sow every 2-3 weeks. |
| Swiss Chard | — | Jan 31 – Feb 14 | — | — | 50–60 days | Fairly cold-hardy; direct sow 1-3 weeks before last frost. Tolerates light frost in fall too. |
| Broccoli | Jan 3 – Jan 17 | — | Jan 31 – Feb 7 | Oct 3 – Oct 10 | 55–80 days | Start indoors 5-7 weeks before last frost; transplant out 2-3 weeks before last frost (hardens off to light frost). |
| Cauliflower | Jan 3 – Jan 17 | — | Feb 7 – Feb 14 | Sep 26 – Oct 3 | 55–85 days | Fussier than broccoli about temperature swings; start indoors 5-7 weeks before last frost, transplant 1-2 weeks before last frost. |
| Cabbage | Jan 3 – Jan 17 | — | Jan 24 – Feb 7 | Sep 26 – Oct 10 | 60–100 days | Cold-hardy; start indoors 5-7 weeks before last frost, transplant 2-4 weeks before last frost. |
| Brussels Sprouts | Jan 3 – Jan 17 | — | Jan 31 – Feb 14 | — | 90–110 days | Long-season crop best timed to mature after a light fall frost for sweetest flavor; start indoors 5-7 weeks before last frost. |
| Carrot | — | Jan 24 – Feb 7 | — | Sep 12 – Sep 26 | 60–80 days | Direct sow only (does not transplant); sow 2-4 weeks before last frost, as soon as soil can be worked. |
| Beet | — | Jan 24 – Feb 7 | — | Sep 26 – Oct 10 | 50–65 days | Direct sow 2-4 weeks before last frost; tolerates light frost. |
| Radish | — | Jan 17 – Jan 31 | — | Oct 24 – Nov 7 | 22–30 days | Very fast and cold-hardy; direct sow 3-5 weeks before last frost, as soon as soil can be worked. |
| Turnip | — | Jan 24 – Feb 7 | — | Sep 26 – Oct 10 | 40–60 days | Cold-hardy; direct sow 2-4 weeks before last frost. |
| Onion | Dec 13 – Dec 27 | — | Jan 24 – Feb 7 | — | 90–120 days | Start seeds indoors 8-10 weeks before last frost (or use sets/transplants); set out 2-4 weeks before last frost, very cold-tolerant as seedlings. |
| Garlic | — | — | — | Nov 7 – Nov 21 | 240–270 days | Fall-planted crop only; not planted in spring in most climates. |
| Potato | — | Jan 24 – Feb 7 | — | — | 70–120 days | Plant seed potatoes 2-4 weeks before last frost, as soon as soil can be worked and is above 45F; light frost on emerging foliage is usually tolerated. |
| Sweet Potato | — | — | Mar 7 – Mar 21 | — | 90–120 days | Set out slips 2-4 weeks after last frost once soil is thoroughly warm (65F+); very frost/cold sensitive. |
| Asparagus | — | — | Jan 24 – Feb 7 | — | 730–1095 days | Perennial; plant crowns 2-4 weeks before last frost as soon as soil can be worked. Takes 2-3 years to full production. |
| Crop | Start indoors | Direct sow | Transplant | Fall planting | Maturity | Notes |
|---|---|---|---|---|---|---|
| Basil | Jan 10 – Jan 17 | — | Feb 28 – Mar 7 | — | 50–70 days | Very frost/cold sensitive; start indoors 5-6 weeks before last frost, transplant only after all danger of frost (1-2 weeks after) and nights stay warm. |
| Cilantro | — | Jan 31 – Feb 14 | — | Oct 10 – Oct 24 | 45–70 days | Cool-season, bolts in heat; direct sow 1-3 weeks before last frost, succession sow through spring. |
| Parsley | Dec 27 – Jan 10 | — | Feb 7 – Feb 14 | — | 70–90 days | Slow to germinate; start indoors 6-8 weeks before last frost, transplant 1-2 weeks before last frost (biennial, cold-tolerant). |
| Dill | — | Jan 31 – Feb 14 | — | — | 40–60 days | Taprooted, does not transplant well; direct sow 1-3 weeks before last frost, succession sow through summer. |
| Oregano | Dec 27 – Jan 10 | — | Feb 21 – Feb 28 | — | 80–90 days | Perennial herb; start indoors 6-8 weeks before last frost, transplant around/just after last frost date. |
| Thyme | Dec 27 – Jan 10 | — | Feb 21 – Feb 28 | — | 85–95 days | Perennial herb, slow from seed; start indoors 6-8 weeks before last frost, transplant around/after last frost. |
| Crop | Start indoors | Direct sow | Transplant | Fall planting | Maturity | Notes |
|---|---|---|---|---|---|---|
| Sunflower | — | Feb 28 – Mar 14 | — | — | 70–100 days | Direct sow 1-3 weeks after last frost once soil has warmed; taprooted, resents transplanting. |
| Zinnia | Jan 24 – Jan 31 | Feb 28 – Mar 14 | Feb 28 – Mar 7 | — | 60–70 days | Frost-tender; direct sow 1-3 weeks after last frost, or start indoors 3-4 weeks early for earlier blooms. |
| Marigold | Jan 10 – Jan 24 | — | Feb 28 – Mar 7 | — | 45–60 days | Frost-tender; start indoors 4-6 weeks before last frost, transplant after all frost danger has passed. |
| Cosmos | Jan 24 – Jan 31 | Feb 28 – Mar 14 | Feb 28 – Mar 7 | — | 60–90 days | Easy from direct seed 1-3 weeks after last frost; can also start indoors 3-4 weeks early. |
| Nasturtium | — | Feb 28 – Mar 14 | — | — | 50–65 days | Frost-tender, resents root disturbance; direct sow 1-3 weeks after last frost once soil has warmed. |
| Dahlia | — | — | Feb 28 – Mar 14 | — | 90–120 days | Plant tubers 1-3 weeks after last frost once soil is warm (60F+); very frost-sensitive. |
Date ranges are estimates based on university extension guidelines and this city's NOAA frost normals — not a guarantee. Scroll to see all columns on narrow screens.
Frequently Asked Questions
When is the last frost in Cibolo, TX?
Based on 1991–2020 NOAA climate normals for the RANDOLPH AFB, TX US station, the last spring frost in Cibolo typically falls around February 21. A cautious gardener might wait until March 14 (only a 10% chance of a later frost), while January 10 marks an earlier, higher-risk planting date.
When is the first frost in Cibolo, TX in fall?
The first fall frost in Cibolo typically arrives around December 5. To stay safe, assume frost could start as early as November 16; in milder years it can hold off until January 1.
How long is the growing season in Cibolo, TX?
Cibolo's average frost-free growing season is about 289 days, running from the typical last spring frost (February 21) to the typical first fall frost (December 5).
What USDA hardiness zone is Cibolo, TX in?
Cibolo, TX is in USDA plant hardiness zone 9a, per the USDA's 2023 Plant Hardiness Zone Map. Subtropical to frost-free — heat, not cold, is the main limit on what you can grow.