Frost Dates & Planting Calendar for Bay Point, CA
Plan your garden around Bay Point, 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 9
Safe Feb 12
Typical Jan 9
Risky Dec 16
First Fall Frost
December 14
Safe Nov 28
Typical Dec 14
Risky Jan 16
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 CONCORD BUCHANAN FLD, CA US, 9.2 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 14 – Nov 28 | — | Jan 16 – Jan 23 | — | 60–85 days | Start indoors 6-8 weeks before last frost; transplant out 1-2 weeks after last frost once soil has warmed. |
| Pepper | Oct 31 – Nov 14 | — | Jan 16 – Jan 30 | — | 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 | Oct 31 – Nov 14 | — | Jan 23 – Jan 30 | — | 65–85 days | Warm-season crop, similar timing to pepper; needs consistently warm soil (65F+) to transplant. |
| Cucumber | Dec 12 – Dec 19 | Jan 16 – Jan 23 | Jan 16 – Jan 23 | — | 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 19 – Dec 26 | Jan 16 – Jan 30 | Jan 16 – Jan 23 | — | 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 12 – Dec 19 | Jan 16 – Jan 30 | Jan 16 – Jan 23 | — | 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 16 – Jan 30 | — | — | 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 12 – Dec 19 | — | Jan 23 – Jan 30 | — | 70–90 days | Needs warm soil (65F+); start indoors 3-4 weeks before last frost, transplant 2-3 weeks after last frost. |
| Cantaloupe | Dec 12 – Dec 19 | — | Jan 23 – Jan 30 | — | 70–90 days | Same warm-soil requirements as watermelon; avoid disturbing roots when transplanting. |
| Corn | — | Jan 9 – Jan 23 | — | — | 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 9 – Jan 23 | — | — | 50–65 days | Direct sow at last frost to 2 weeks after, once soil has warmed; frost-tender, do not rush. |
| Pea | — | Nov 28 – Dec 12 | — | — | 55–70 days | Cold-hardy; direct sow 4-6 weeks before last frost as soon as soil can be worked. |
| Lettuce | — | Dec 12 – Dec 26 | — | Oct 19 – Nov 2 | 45–60 days | Cold-hardy; direct sow 2-4 weeks before last frost. Also transplantable from indoor starts. |
| Spinach | — | Nov 28 – Dec 12 | — | Oct 19 – Nov 2 | 40–50 days | Very cold-hardy; direct sow 4-6 weeks before last frost as soon as soil can be worked. |
| Kale | — | Dec 12 – Dec 26 | — | Oct 5 – Oct 19 | 50–65 days | Cold-hardy; direct sow 2-4 weeks before last frost or start indoors for earlier transplants. |
| Arugula | — | Dec 12 – Dec 26 | — | Nov 2 – Nov 9 | 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 19 – Jan 2 | — | — | 50–60 days | Fairly cold-hardy; direct sow 1-3 weeks before last frost. Tolerates light frost in fall too. |
| Broccoli | Nov 21 – Dec 5 | — | Dec 19 – Dec 26 | Oct 12 – Oct 19 | 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 21 – Dec 5 | — | Dec 26 – Jan 2 | Oct 5 – Oct 12 | 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 21 – Dec 5 | — | Dec 12 – Dec 26 | Oct 5 – Oct 19 | 60–100 days | Cold-hardy; start indoors 5-7 weeks before last frost, transplant 2-4 weeks before last frost. |
| Brussels Sprouts | Nov 21 – Dec 5 | — | Dec 19 – Jan 2 | — | 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 12 – Dec 26 | — | Sep 21 – Oct 5 | 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 12 – Dec 26 | — | Oct 5 – Oct 19 | 50–65 days | Direct sow 2-4 weeks before last frost; tolerates light frost. |
| Radish | — | Dec 5 – Dec 19 | — | Nov 2 – Nov 16 | 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 12 – Dec 26 | — | Oct 5 – Oct 19 | 40–60 days | Cold-hardy; direct sow 2-4 weeks before last frost. |
| Onion | Oct 31 – Nov 14 | — | Dec 12 – Dec 26 | — | 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 16 – Nov 30 | 240–270 days | Fall-planted crop only; not planted in spring in most climates. |
| Potato | — | Dec 12 – Dec 26 | — | — | 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 23 – Feb 6 | — | 90–120 days | Set out slips 2-4 weeks after last frost once soil is thoroughly warm (65F+); very frost/cold sensitive. |
| Asparagus | — | — | Dec 12 – Dec 26 | — | 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 | Nov 28 – Dec 5 | — | Jan 16 – Jan 23 | — | 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 19 – Jan 2 | — | Oct 19 – Nov 2 | 45–70 days | Cool-season, bolts in heat; direct sow 1-3 weeks before last frost, succession sow through spring. |
| Parsley | Nov 14 – Nov 28 | — | Dec 26 – Jan 2 | — | 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 19 – Jan 2 | — | — | 40–60 days | Taprooted, does not transplant well; direct sow 1-3 weeks before last frost, succession sow through summer. |
| Oregano | Nov 14 – Nov 28 | — | Jan 9 – Jan 16 | — | 80–90 days | Perennial herb; start indoors 6-8 weeks before last frost, transplant around/just after last frost date. |
| Thyme | Nov 14 – Nov 28 | — | Jan 9 – Jan 16 | — | 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 16 – Jan 30 | — | — | 70–100 days | Direct sow 1-3 weeks after last frost once soil has warmed; taprooted, resents transplanting. |
| Zinnia | Dec 12 – Dec 19 | Jan 16 – Jan 30 | Jan 16 – Jan 23 | — | 60–70 days | Frost-tender; direct sow 1-3 weeks after last frost, or start indoors 3-4 weeks early for earlier blooms. |
| Marigold | Nov 28 – Dec 12 | — | Jan 16 – Jan 23 | — | 45–60 days | Frost-tender; start indoors 4-6 weeks before last frost, transplant after all frost danger has passed. |
| Cosmos | Dec 12 – Dec 19 | Jan 16 – Jan 30 | Jan 16 – Jan 23 | — | 60–90 days | Easy from direct seed 1-3 weeks after last frost; can also start indoors 3-4 weeks early. |
| Nasturtium | — | Jan 16 – Jan 30 | — | — | 50–65 days | Frost-tender, resents root disturbance; direct sow 1-3 weeks after last frost once soil has warmed. |
| Dahlia | — | — | Jan 16 – Jan 30 | — | 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 Bay Point, CA?
Based on 1991–2020 NOAA climate normals for the CONCORD BUCHANAN FLD, CA US station, the last spring frost in Bay Point typically falls around January 9. A cautious gardener might wait until February 12 (only a 10% chance of a later frost), while December 16 marks an earlier, higher-risk planting date.
When is the first frost in Bay Point, CA in fall?
The first fall frost in Bay Point typically arrives around December 14. To stay safe, assume frost could start as early as November 28; in milder years it can hold off until January 16.
How long is the growing season in Bay Point, CA?
Bay Point's average frost-free growing season is about 343 days, running from the typical last spring frost (January 9) to the typical first fall frost (December 14).
What USDA hardiness zone is Bay Point, CA in?
Bay Point, 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.