Frost Dates for Claremont, CA 91711
Last spring frost January 26 · First fall frost December 21 · 329 frost-free days · USDA Zone 10a
ZIP 91711 has about 37,500 people.
Very long season: 329 frost-free days.
Frost probability for 91711
| Frost | 10% | 50% | 90% |
|---|---|---|---|
| Spring (last frost) | March 7 | January 26 | — |
| Fall (first frost) | November 18 | December 21 | — |
Dates come from NOAA 1971–2000 freeze probabilities at RIVERSIDE FIRE STN 3 (36.0 km away); the 50% date is the median year.
Which crops fit a 329-day season in Claremont
In Claremont (329 frost-free days, a very long season), 30 of 56 planner crops fit outright, 25 get two plantings, 1 crop is perennial.
| Crop | Start indoors | Plant out / sow | Days you have | Verdict | Last sow date |
|---|---|---|---|---|---|
| Tomato | Dec 22 | Feb 9–Feb 16 | 287 | fits: 80 days to maturity, 287 available after Feb 9. | Aug 21 |
| Pepper | Dec 15 | Feb 9–Feb 16 | 287 | fits: 75 days to maturity, 287 available after Feb 9. | Aug 26 |
| Lettuce | Dec 1 | Dec 29–Jan 5 | 364 | two-plantings: Plant Dec 29 and again by Oct 30; both mature before Dec 28. | Oct 30 |
| Carrots | — | Jan 5–Jan 12 | 371 | fits: 70 days to maturity, 371 available after Jan 5. | Oct 19 |
| Cucumber | Jan 5 | Feb 9–Feb 16 | 301 | two-plantings: Plant Feb 9 and again by Sep 24; both mature before Dec 7. | Sep 24 |
| Beans | — | Feb 2–Feb 16 | 315 | two-plantings: Plant Feb 2 and again by Oct 1; both mature before Dec 14. | Oct 1 |
| Peas | — | Dec 1–Feb 9 | 392 | fits: 65 days to maturity, 392 available after Dec 1. | Oct 10 |
| Zucchini | Jan 12 | Feb 9–Feb 16 | 301 | two-plantings: Plant Feb 9 and again by Sep 29; both mature before Dec 7. | Sep 29 |
| Onion | Nov 3 | Dec 29–Jan 12 | 364 | fits: 100 days to maturity, 364 available after Dec 29. | — |
| Spinach | — | Dec 1–Jan 19 | 406 | two-plantings: Plant Dec 1 and again by Nov 18; both mature before Jan 11. | Nov 18 |
| Kale | Nov 17 | Dec 29–Jan 12 | 378 | two-plantings: Plant Dec 29 and again by Nov 3; both mature before Jan 11. | Nov 3 |
| Broccoli | Dec 1 | Dec 29–Jan 12 | 364 | fits: 80 days to maturity, 364 available after Dec 29. | Sep 25 |
| Cabbage | Dec 1 | Dec 29–Jan 12 | 378 | fits: 70 days to maturity, 378 available after Dec 29. | Oct 19 |
| Radish | — | Dec 1–Feb 23 | 392 | two-plantings: Plant Dec 1 and again by Nov 19; both mature before Dec 28. | Nov 19 |
| Beets | — | Dec 1–Feb 23 | 392 | two-plantings: Plant Dec 1 and again by Oct 20; both mature before Dec 28. | Oct 20 |
| Potatoes | — | Jan 12–Jan 19 | 350 | fits: 90 days to maturity, 350 available after Jan 12. | — |
| Garlic | — | Dec 21 | 434 | overwinter: Plant Dec 21 to Jan 11; harvest the following summer. | Jan 11 |
| Strawberry | — | Dec 22–Feb 16 | 385 | perennial: A perennial: plant Dec 22; it fruits from the following year and keeps producing for several years. | — |
| Corn | Dec 29 | Feb 2–Feb 9 | 301 | fits: 75 days to maturity, 301 available after Feb 2. | Sep 2 |
| Pumpkin | Jan 12 | Feb 9–Feb 9 | 294 | fits: 100 days to maturity, 294 available after Feb 9. | Aug 8 |
| Cauliflower | Dec 15 | Jan 19–Feb 2 | 343 | fits: 75 days to maturity, 343 available after Jan 19. | Sep 30 |
| Swiss Chard | Dec 1 | Jan 12–Jan 12 | 350 | two-plantings: Plant Jan 12 and again by Oct 20; both mature before Dec 28. | Oct 20 |
| Arugula | — | Dec 1–Feb 23 | 406 | two-plantings: Plant Dec 1 and again by Nov 18; both mature before Jan 11. | Nov 18 |
| Brussel Sprouts | Dec 1 | Dec 29–Jan 12 | 378 | fits: 100 days to maturity, 378 available after Dec 29. | Sep 19 |
| Butternut Squash | Jan 12 | Feb 9–Feb 16 | 294 | fits: 100 days to maturity, 294 available after Feb 9. | Aug 8 |
| Eggplant | Dec 8 | Feb 9–Feb 16 | 287 | fits: 70 days to maturity, 287 available after Feb 9. | Aug 31 |
| Okra | Dec 29 | Feb 2–Feb 9 | 308 | two-plantings: Plant Feb 2 and again by Sep 29; both mature before Dec 7. | Sep 29 |
| Basil | Dec 22 | Feb 16–Feb 16 | 294 | two-plantings: Plant Feb 16 and again by Sep 24; both mature before Dec 7. | Sep 24 |
| Cilantro | — | Dec 29–Jan 19 | 364 | two-plantings: Plant Dec 29 and again by Oct 25; both mature before Dec 28. | Oct 25 |
| Parsley | Nov 17 | Feb 2–Feb 9 | 329 | fits: 70 days to maturity, 329 available after Feb 2. | Oct 5 |
| Celery | Nov 17 | Feb 2–Feb 16 | 329 | fits: 120 days to maturity, 329 available after Feb 2. | Aug 16 |
| Scallions | Nov 17 | Dec 29–Jan 12 | 378 | two-plantings: Plant Dec 29 and again by Oct 29; both mature before Jan 11. | Oct 29 |
| Turnip | — | Dec 29–Jan 12 | 378 | two-plantings: Plant Dec 29 and again by Nov 8; both mature before Jan 11. | Nov 8 |
| Kohlrabi | — | Dec 15–Dec 29 | 392 | two-plantings: Plant Dec 15 and again by Nov 3; both mature before Jan 11. | Nov 3 |
| Bok Choy | Dec 29 | Jan 19–Jan 26 | 343 | two-plantings: Plant Jan 19 and again by Oct 30; both mature before Dec 28. | Oct 30 |
| Collards | Nov 17 | Dec 29–Jan 12 | 378 | two-plantings: Plant Dec 29 and again by Oct 29; both mature before Jan 11. | Oct 29 |
| Cantaloupe | Jan 12 | Feb 9–Feb 16 | 287 | fits: 85 days to maturity, 287 available after Feb 9. | Aug 16 |
| Chives | Nov 3 | Feb 2–Feb 9 | 343 | fits: 90 days to maturity, 343 available after Feb 2. | — |
| Dill | — | Dec 1–Feb 23 | 392 | two-plantings: Plant Dec 1 and again by Oct 20; both mature before Dec 28. | Oct 20 |
| Oregano | Nov 17 | Feb 2–Feb 9 | 343 | fits: 80 days to maturity, 343 available after Feb 2. | — |
| Rosemary | Nov 3 | Feb 2–Feb 9 | 329 | fits: 80 days to maturity, 329 available after Feb 2. | — |
| Sage | Dec 1 | Feb 2–Feb 9 | 343 | fits: 75 days to maturity, 343 available after Feb 2. | — |
| Thyme | Nov 17 | Feb 2–Feb 9 | 343 | fits: 90 days to maturity, 343 available after Feb 2. | — |
| Calendula | Dec 15 | Jan 12–Jan 26 | 350 | two-plantings: Plant Jan 12 and again by Oct 25; both mature before Dec 28. | Oct 25 |
| Cosmos | Dec 29 | Jan 26–Feb 9 | 315 | two-plantings: Plant Jan 26 and again by Sep 24; both mature before Dec 7. | Sep 24 |
| Lavender | Nov 3 | Jan 26–Feb 9 | 350 | fits: 90 days to maturity, 350 available after Jan 26. | — |
| Marigolds | Dec 15 | Jan 26–Feb 2 | 315 | two-plantings: Plant Jan 26 and again by Oct 4; both mature before Dec 7. | Oct 4 |
| Melons | Jan 12 | Feb 9–Feb 16 | 287 | fits: 85 days to maturity, 287 available after Feb 9. | Aug 16 |
| Mint | — | Jan 26–Feb 9 | 350 | fits: 90 days to maturity, 350 available after Jan 26. | — |
| Nasturtiums | Dec 29 | Jan 26–Feb 2 | 315 | two-plantings: Plant Jan 26 and again by Sep 29; both mature before Dec 7. | Sep 29 |
| Pole Beans | — | Feb 2–Feb 16 | 308 | fits: 65 days to maturity, 308 available after Feb 2. | Sep 19 |
| Spaghetti Squash | Jan 12 | Feb 9–Feb 16 | 294 | fits: 90 days to maturity, 294 available after Feb 9. | Aug 18 |
| Sunflowers | — | Jan 26–Feb 9 | 315 | fits: 70 days to maturity, 315 available after Jan 26. | Sep 14 |
| Tomatillos | Dec 1 | Feb 2–Feb 9 | 294 | fits: 75 days to maturity, 294 available after Feb 2. | Aug 26 |
| Watermelon | Jan 12 | Feb 2–Feb 9 | 294 | fits: 80 days to maturity, 294 available after Feb 2. | Aug 21 |
| Yellow Squash | Jan 12 | Feb 9–Feb 16 | 301 | two-plantings: Plant Feb 9 and again by Sep 29; both mature before Dec 7. | Sep 29 |
| Zinnias | Dec 29 | Jan 26–Feb 9 | 315 | two-plantings: Plant Jan 26 and again by Sep 24; both mature before Dec 7. | Sep 24 |
Month by month in Claremont
| Month | What to do |
|---|---|
| January | Start indoors: Cucumber (Jan 5), Butternut Squash (Jan 12), Cantaloupe (Jan 12), Melons (Jan 12), Pumpkin (Jan 12), Spaghetti Squash (Jan 12), +3 more. Direct sow from: Carrots (Jan 5), Potatoes (Jan 12), Sunflowers (Jan 26). Transplant from: Calendula (Jan 12), Swiss Chard (Jan 12), Bok Choy (Jan 19), Cauliflower (Jan 19), Cosmos (Jan 26), Lavender (Jan 26), +4 more. Last frost around January 26. Last sowing dates: Garlic (Jan 11). |
| February | Direct sow from: Beans (Feb 2), Pole Beans (Feb 2). Transplant from: Celery (Feb 2), Chives (Feb 2), Corn (Feb 2), Okra (Feb 2), Oregano (Feb 2), Parsley (Feb 2), +17 more. |
| March | Succession plant lettuce and greens. Keep beds weeded and watered consistently. |
| April | Harvest regularly to encourage production. Monitor for pests and disease. |
| May | Midsummer: harvest beans, zucchini, cucumbers. Start brassica seeds indoors for fall. |
| June | Direct sow carrots and beets for fall harvest. Start fall broccoli and kale indoors. |
| July | Direct sow carrots and beets for fall harvest. Start fall broccoli and kale indoors. |
| August | Last sowing dates: Butternut Squash (Aug 8), Pumpkin (Aug 8), Cantaloupe (Aug 16), Celery (Aug 16), Melons (Aug 16), Spaghetti Squash (Aug 18), +5 more. |
| September | Last sowing dates: Corn (Sep 2), Sunflowers (Sep 14), Brussel Sprouts (Sep 19), Pole Beans (Sep 19), Basil (Sep 24), Cosmos (Sep 24), +8 more. |
| October | Last sowing dates: Beans (Oct 1), Marigolds (Oct 4), Parsley (Oct 5), Peas (Oct 10), Cabbage (Oct 19), Carrots (Oct 19), +9 more. |
| November | Start indoors: Chives (Nov 3), Lavender (Nov 3), Onion (Nov 3), Rosemary (Nov 3), Celery (Nov 17), Collards (Nov 17), +5 more. Last sowing dates: Kale (Nov 3), Kohlrabi (Nov 3), Turnip (Nov 8), Arugula (Nov 18), Spinach (Nov 18), Radish (Nov 19). |
| December | Start indoors: Broccoli (Dec 1), Brussel Sprouts (Dec 1), Cabbage (Dec 1), Lettuce (Dec 1), Sage (Dec 1), Swiss Chard (Dec 1), +14 more. Direct sow from: Arugula (Dec 1), Beets (Dec 1), Dill (Dec 1), Peas (Dec 1), Radish (Dec 1), Spinach (Dec 1), +4 more. Transplant from: Broccoli (Dec 29), Brussel Sprouts (Dec 29), Cabbage (Dec 29), Collards (Dec 29), Kale (Dec 29), Lettuce (Dec 29), +2 more. Plant: Strawberry (Dec 22). First frost around December 21. |
Frequently Asked Questions
What is the last frost date for Claremont, CA (ZIP 91711)?
The median last spring frost date for Claremont, CA (ZIP code 91711) is around January 26. This is the 50th-percentile date — meaning half of all years see frost end before this date. Use the 10% and 90% dates to understand the full range of risk in your area.
What is the first fall frost date in Claremont, CA?
The median first fall frost date for Claremont, CA is around December 21. Plan to harvest or protect frost-sensitive crops like tomatoes and peppers at least a week before this date to avoid losses. The first frost arrives around November 18 in the earliest one-in-ten years, so cover tomatoes and peppers from then.
How long is the growing season in Claremont, CA?
The frost-free growing season in Claremont is about 329 days. This window — from your last spring frost to your first fall frost — is when warm-season vegetables thrive. Cold-hardy crops like kale, spinach, and peas can extend your season by weeks on either side. In Claremont (329 frost-free days, a very long season), 30 of 56 planner crops fit outright, 25 get two plantings, 1 crop is perennial.
What USDA hardiness zone is Claremont, CA?
Claremont, CA is in USDA hardiness zone 10a (2023 USDA Plant Hardiness Zone Map). Zones come from the average coldest winter temperature, so they tell you which perennials survive the winter; the frost dates on this page tell you when to plant.
When should I start tomatoes indoors in Claremont, CA?
Start tomatoes indoors Dec 22 and plant out Feb 9 in Claremont. The planner uses the local median last frost and this crop's indoor-start and transplant offsets.
How many plantings of lettuce fit in Claremont?
Two: plant Dec 29 and again by Oct 30; both mature before Dec 28.
When do I plant garlic in Claremont?
Dec 21 to Jan 11; it overwinters and is ready the following summer.
Can I get two tomato crops in Claremont?
Yes: plant out Feb 9 for a summer crop, and set out a second round of transplants by Aug 21 for a fall crop.
Which nearby ZIP has a longer season?
Upland (ZIP 91786) has 338 frost-free days, 9 more than Claremont (ZIP 91711). See Upland ZIP 91786 frost dates
Nearby and related
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