Frost Dates & Planting Calendar for Pittsburg, CA
Plan your garden around Pittsburg, CA's typical frost-free growing season, using NOAA climate normals and a 42-crop planting calendar built for this location.
Last Spring Frost
January 12
Safe Feb 1
Typical Jan 12
Risky Dec 20
First Fall Frost
December 19
Safe Nov 29
Typical Dec 19
Risky Jan 12
Growing Season
343 days
Typical last frost to typical first frost.
USDA Hardiness Zone
Zone 9b
Subtropical to frost-free — heat, not cold, is the main limit on what you can grow.
Data: NOAA station ANTIOCH PUMPING PLT #3, CA US, 12.6 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 | Nov 17 – Dec 1 | — | Jan 19 – Jan 26 | — | 60–85 days | Start indoors 6-8 weeks before last frost; transplant out 1-2 weeks after last frost once soil has warmed. |
| Pepper | Nov 3 – Nov 17 | — | Jan 19 – Feb 2 | — | 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 | Nov 3 – Nov 17 | — | Jan 26 – Feb 2 | — | 65–85 days | Warm-season crop, similar timing to pepper; needs consistently warm soil (65F+) to transplant. |
| Cucumber | Dec 15 – Dec 22 | Jan 19 – Jan 26 | Jan 19 – Jan 26 | — | 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 | Dec 22 – Dec 29 | Jan 19 – Feb 2 | Jan 19 – Jan 26 | — | 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 | Dec 15 – Dec 22 | Jan 19 – Feb 2 | Jan 19 – Jan 26 | — | 80–110 days | Long season; direct sow after soil warms, or start indoors 3-4 weeks before last frost in short-season climates. |
| Pumpkin | — | Jan 19 – Feb 2 | — | — | 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 | Dec 15 – Dec 22 | — | Jan 26 – Feb 2 | — | 70–90 days | Needs warm soil (65F+); start indoors 3-4 weeks before last frost, transplant 2-3 weeks after last frost. |
| Cantaloupe | Dec 15 – Dec 22 | — | Jan 26 – Feb 2 | — | 70–90 days | Same warm-soil requirements as watermelon; avoid disturbing roots when transplanting. |
| Corn | — | Jan 12 – Jan 26 | — | — | 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 | — | Jan 12 – Jan 26 | — | — | 50–65 days | Direct sow at last frost to 2 weeks after, once soil has warmed; frost-tender, do not rush. |
| Pea | — | Dec 1 – Dec 15 | — | — | 55–70 days | Cold-hardy; direct sow 4-6 weeks before last frost as soon as soil can be worked. |
| Lettuce | — | Dec 15 – Dec 29 | — | Oct 24 – Nov 7 | 45–60 days | Cold-hardy; direct sow 2-4 weeks before last frost. Also transplantable from indoor starts. |
| Spinach | — | Dec 1 – Dec 15 | — | Oct 24 – Nov 7 | 40–50 days | Very cold-hardy; direct sow 4-6 weeks before last frost as soon as soil can be worked. |
| Kale | — | Dec 15 – Dec 29 | — | Oct 10 – Oct 24 | 50–65 days | Cold-hardy; direct sow 2-4 weeks before last frost or start indoors for earlier transplants. |
| Arugula | — | Dec 15 – Dec 29 | — | Nov 7 – Nov 14 | 30–40 days | Fast-growing, cold-tolerant green; direct sow 2-4 weeks before last frost, succession sow every 2-3 weeks. |
| Swiss Chard | — | Dec 22 – Jan 5 | — | — | 50–60 days | Fairly cold-hardy; direct sow 1-3 weeks before last frost. Tolerates light frost in fall too. |
| Broccoli | Nov 24 – Dec 8 | — | Dec 22 – Dec 29 | Oct 17 – Oct 24 | 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 | Nov 24 – Dec 8 | — | Dec 29 – Jan 5 | Oct 10 – Oct 17 | 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 | Nov 24 – Dec 8 | — | Dec 15 – Dec 29 | Oct 10 – Oct 24 | 60–100 days | Cold-hardy; start indoors 5-7 weeks before last frost, transplant 2-4 weeks before last frost. |
| Brussels Sprouts | Nov 24 – Dec 8 | — | Dec 22 – Jan 5 | — | 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 | — | Dec 15 – Dec 29 | — | Sep 26 – Oct 10 | 60–80 days | Direct sow only (does not transplant); sow 2-4 weeks before last frost, as soon as soil can be worked. |
| Beet | — | Dec 15 – Dec 29 | — | Oct 10 – Oct 24 | 50–65 days | Direct sow 2-4 weeks before last frost; tolerates light frost. |
| Radish | — | Dec 8 – Dec 22 | — | Nov 7 – Nov 21 | 22–30 days | Very fast and cold-hardy; direct sow 3-5 weeks before last frost, as soon as soil can be worked. |
| Turnip | — | Dec 15 – Dec 29 | — | Oct 10 – Oct 24 | 40–60 days | Cold-hardy; direct sow 2-4 weeks before last frost. |
| Onion | Nov 3 – Nov 17 | — | Dec 15 – Dec 29 | — | 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 21 – Dec 5 | 240–270 days | Fall-planted crop only; not planted in spring in most climates. |
| Potato | — | Dec 15 – Dec 29 | — | — | 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 | — | — | Jan 26 – Feb 9 | — | 90–120 days | Set out slips 2-4 weeks after last frost once soil is thoroughly warm (65F+); very frost/cold sensitive. |
| Asparagus | — | — | Dec 15 – Dec 29 | — | 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 | Dec 1 – Dec 8 | — | Jan 19 – Jan 26 | — | 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 | — | Dec 22 – Jan 5 | — | Oct 24 – Nov 7 | 45–70 days | Cool-season, bolts in heat; direct sow 1-3 weeks before last frost, succession sow through spring. |
| Parsley | Nov 17 – Dec 1 | — | Dec 29 – Jan 5 | — | 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 | — | Dec 22 – Jan 5 | — | — | 40–60 days | Taprooted, does not transplant well; direct sow 1-3 weeks before last frost, succession sow through summer. |
| Oregano | Nov 17 – Dec 1 | — | Jan 12 – Jan 19 | — | 80–90 days | Perennial herb; start indoors 6-8 weeks before last frost, transplant around/just after last frost date. |
| Thyme | Nov 17 – Dec 1 | — | Jan 12 – Jan 19 | — | 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 | — | Jan 19 – Feb 2 | — | — | 70–100 days | Direct sow 1-3 weeks after last frost once soil has warmed; taprooted, resents transplanting. |
| Zinnia | Dec 15 – Dec 22 | Jan 19 – Feb 2 | Jan 19 – Jan 26 | — | 60–70 days | Frost-tender; direct sow 1-3 weeks after last frost, or start indoors 3-4 weeks early for earlier blooms. |
| Marigold | Dec 1 – Dec 15 | — | Jan 19 – Jan 26 | — | 45–60 days | Frost-tender; start indoors 4-6 weeks before last frost, transplant after all frost danger has passed. |
| Cosmos | Dec 15 – Dec 22 | Jan 19 – Feb 2 | Jan 19 – Jan 26 | — | 60–90 days | Easy from direct seed 1-3 weeks after last frost; can also start indoors 3-4 weeks early. |
| Nasturtium | — | Jan 19 – Feb 2 | — | — | 50–65 days | Frost-tender, resents root disturbance; direct sow 1-3 weeks after last frost once soil has warmed. |
| Dahlia | — | — | Jan 19 – Feb 2 | — | 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 Pittsburg, CA?
Based on 1991–2020 NOAA climate normals for the ANTIOCH PUMPING PLT #3, CA US station, the last spring frost in Pittsburg typically falls around January 12. A cautious gardener might wait until February 1 (only a 10% chance of a later frost), while December 20 marks an earlier, higher-risk planting date.
When is the first frost in Pittsburg, CA in fall?
The first fall frost in Pittsburg typically arrives around December 19. To stay safe, assume frost could start as early as November 29; in milder years it can hold off until January 12.
How long is the growing season in Pittsburg, CA?
Pittsburg's average frost-free growing season is about 343 days, running from the typical last spring frost (January 12) to the typical first fall frost (December 19).
What USDA hardiness zone is Pittsburg, CA in?
Pittsburg, CA is in USDA plant hardiness zone 9b, 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.