Frost Dates for Fontana, CA 92336
Last spring frost January 21 · First fall frost December 24 · 337 frost-free days · USDA Zone 10a
ZIP 92336 has about 106,000 people, the largest of 3 ZIP codes in Fontana.
Very long season: 337 frost-free days.
Frost probability for 92336
| Frost | 10% | 50% | 90% |
|---|---|---|---|
| Spring (last frost) | March 7 | January 21 | — |
| Fall (first frost) | November 21 | December 24 | — |
Dates come from NOAA 1971–2000 freeze probabilities at SAN BERNARDINO F S 226 (19.0 km away); the 50% date is the median year.
Frost dates by ZIP code in Fontana, CA
| ZIP | Last spring frost (50%) | First fall frost (50%) | Zone |
|---|---|---|---|
| 92336 | January 21 | December 24 | 10a |
| 92335 | January 21 | December 24 | 10a |
| 92337 | January 21 | December 24 | 10a |
Which crops fit a 337-day season in Fontana
In Fontana (337 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 17 | Feb 4–Feb 11 | 295 | fits: 80 days to maturity, 295 available after Feb 4. | Aug 24 |
| Pepper | Dec 10 | Feb 4–Feb 11 | 295 | fits: 75 days to maturity, 295 available after Feb 4. | Aug 29 |
| Lettuce | Nov 26 | Dec 24–Dec 31 | 372 | two-plantings: Plant Dec 24 and again by Nov 2; both mature before Dec 31. | Nov 2 |
| Carrots | — | Dec 31–Jan 7 | 379 | fits: 70 days to maturity, 379 available after Dec 31. | Oct 22 |
| Cucumber | Dec 31 | Feb 4–Feb 11 | 309 | two-plantings: Plant Feb 4 and again by Sep 27; both mature before Dec 10. | Sep 27 |
| Beans | — | Jan 28–Feb 11 | 323 | two-plantings: Plant Jan 28 and again by Oct 4; both mature before Dec 17. | Oct 4 |
| Peas | — | Nov 26–Feb 4 | 400 | fits: 65 days to maturity, 400 available after Nov 26. | Oct 13 |
| Zucchini | Jan 7 | Feb 4–Feb 11 | 309 | two-plantings: Plant Feb 4 and again by Oct 2; both mature before Dec 10. | Oct 2 |
| Onion | Oct 29 | Dec 24–Jan 7 | 372 | fits: 100 days to maturity, 372 available after Dec 24. | — |
| Spinach | — | Nov 26–Jan 14 | 414 | two-plantings: Plant Nov 26 and again by Nov 21; both mature before Jan 14. | Nov 21 |
| Kale | Nov 12 | Dec 24–Jan 7 | 386 | two-plantings: Plant Dec 24 and again by Nov 6; both mature before Jan 14. | Nov 6 |
| Broccoli | Nov 26 | Dec 24–Jan 7 | 372 | fits: 80 days to maturity, 372 available after Dec 24. | Sep 28 |
| Cabbage | Nov 26 | Dec 24–Jan 7 | 386 | fits: 70 days to maturity, 386 available after Dec 24. | Oct 22 |
| Radish | — | Nov 26–Feb 18 | 400 | two-plantings: Plant Nov 26 and again by Nov 22; both mature before Dec 31. | Nov 22 |
| Beets | — | Nov 26–Feb 18 | 400 | two-plantings: Plant Nov 26 and again by Oct 23; both mature before Dec 31. | Oct 23 |
| Potatoes | — | Jan 7–Jan 14 | 358 | fits: 90 days to maturity, 358 available after Jan 7. | — |
| Garlic | — | Dec 24 | 442 | overwinter: Plant Dec 24 to Jan 14; harvest the following summer. | Jan 14 |
| Strawberry | — | Dec 17–Feb 11 | 393 | perennial: A perennial: plant Dec 17; it fruits from the following year and keeps producing for several years. | — |
| Corn | Dec 24 | Jan 28–Feb 4 | 309 | fits: 75 days to maturity, 309 available after Jan 28. | Sep 5 |
| Pumpkin | Jan 7 | Feb 4–Feb 4 | 302 | fits: 100 days to maturity, 302 available after Feb 4. | Aug 11 |
| Cauliflower | Dec 10 | Jan 14–Jan 28 | 351 | fits: 75 days to maturity, 351 available after Jan 14. | Oct 3 |
| Swiss Chard | Nov 26 | Jan 7–Jan 7 | 358 | two-plantings: Plant Jan 7 and again by Oct 23; both mature before Dec 31. | Oct 23 |
| Arugula | — | Nov 26–Feb 18 | 414 | two-plantings: Plant Nov 26 and again by Nov 21; both mature before Jan 14. | Nov 21 |
| Brussel Sprouts | Nov 26 | Dec 24–Jan 7 | 386 | fits: 100 days to maturity, 386 available after Dec 24. | Sep 22 |
| Butternut Squash | Jan 7 | Feb 4–Feb 11 | 302 | fits: 100 days to maturity, 302 available after Feb 4. | Aug 11 |
| Eggplant | Dec 3 | Feb 4–Feb 11 | 295 | fits: 70 days to maturity, 295 available after Feb 4. | Sep 3 |
| Okra | Dec 24 | Jan 28–Feb 4 | 316 | two-plantings: Plant Jan 28 and again by Oct 2; both mature before Dec 10. | Oct 2 |
| Basil | Dec 17 | Feb 11–Feb 11 | 302 | two-plantings: Plant Feb 11 and again by Sep 27; both mature before Dec 10. | Sep 27 |
| Cilantro | — | Dec 24–Jan 14 | 372 | two-plantings: Plant Dec 24 and again by Oct 28; both mature before Dec 31. | Oct 28 |
| Parsley | Nov 12 | Jan 28–Feb 4 | 337 | fits: 70 days to maturity, 337 available after Jan 28. | Oct 8 |
| Celery | Nov 12 | Jan 28–Feb 11 | 337 | fits: 120 days to maturity, 337 available after Jan 28. | Aug 19 |
| Scallions | Nov 12 | Dec 24–Jan 7 | 386 | two-plantings: Plant Dec 24 and again by Nov 1; both mature before Jan 14. | Nov 1 |
| Turnip | — | Dec 24–Jan 7 | 386 | two-plantings: Plant Dec 24 and again by Nov 11; both mature before Jan 14. | Nov 11 |
| Kohlrabi | — | Dec 10–Dec 24 | 400 | two-plantings: Plant Dec 10 and again by Nov 6; both mature before Jan 14. | Nov 6 |
| Bok Choy | Dec 24 | Jan 14–Jan 21 | 351 | two-plantings: Plant Jan 14 and again by Nov 2; both mature before Dec 31. | Nov 2 |
| Collards | Nov 12 | Dec 24–Jan 7 | 386 | two-plantings: Plant Dec 24 and again by Nov 1; both mature before Jan 14. | Nov 1 |
| Cantaloupe | Jan 7 | Feb 4–Feb 11 | 295 | fits: 85 days to maturity, 295 available after Feb 4. | Aug 19 |
| Chives | Oct 29 | Jan 28–Feb 4 | 351 | fits: 90 days to maturity, 351 available after Jan 28. | — |
| Dill | — | Nov 26–Feb 18 | 400 | two-plantings: Plant Nov 26 and again by Oct 23; both mature before Dec 31. | Oct 23 |
| Oregano | Nov 12 | Jan 28–Feb 4 | 351 | fits: 80 days to maturity, 351 available after Jan 28. | — |
| Rosemary | Oct 29 | Jan 28–Feb 4 | 337 | fits: 80 days to maturity, 337 available after Jan 28. | — |
| Sage | Nov 26 | Jan 28–Feb 4 | 351 | fits: 75 days to maturity, 351 available after Jan 28. | — |
| Thyme | Nov 12 | Jan 28–Feb 4 | 351 | fits: 90 days to maturity, 351 available after Jan 28. | — |
| Calendula | Dec 10 | Jan 7–Jan 21 | 358 | two-plantings: Plant Jan 7 and again by Oct 28; both mature before Dec 31. | Oct 28 |
| Cosmos | Dec 24 | Jan 21–Feb 4 | 323 | two-plantings: Plant Jan 21 and again by Sep 27; both mature before Dec 10. | Sep 27 |
| Lavender | Oct 29 | Jan 21–Feb 4 | 358 | fits: 90 days to maturity, 358 available after Jan 21. | — |
| Marigolds | Dec 10 | Jan 21–Jan 28 | 323 | two-plantings: Plant Jan 21 and again by Oct 7; both mature before Dec 10. | Oct 7 |
| Melons | Jan 7 | Feb 4–Feb 11 | 295 | fits: 85 days to maturity, 295 available after Feb 4. | Aug 19 |
| Mint | — | Jan 21–Feb 4 | 358 | fits: 90 days to maturity, 358 available after Jan 21. | — |
| Nasturtiums | Dec 24 | Jan 21–Jan 28 | 323 | two-plantings: Plant Jan 21 and again by Oct 2; both mature before Dec 10. | Oct 2 |
| Pole Beans | — | Jan 28–Feb 11 | 316 | fits: 65 days to maturity, 316 available after Jan 28. | Sep 22 |
| Spaghetti Squash | Jan 7 | Feb 4–Feb 11 | 302 | fits: 90 days to maturity, 302 available after Feb 4. | Aug 21 |
| Sunflowers | — | Jan 21–Feb 4 | 323 | fits: 70 days to maturity, 323 available after Jan 21. | Sep 17 |
| Tomatillos | Nov 26 | Jan 28–Feb 4 | 302 | fits: 75 days to maturity, 302 available after Jan 28. | Aug 29 |
| Watermelon | Jan 7 | Jan 28–Feb 4 | 302 | fits: 80 days to maturity, 302 available after Jan 28. | Aug 24 |
| Yellow Squash | Jan 7 | Feb 4–Feb 11 | 309 | two-plantings: Plant Feb 4 and again by Oct 2; both mature before Dec 10. | Oct 2 |
| Zinnias | Dec 24 | Jan 21–Feb 4 | 323 | two-plantings: Plant Jan 21 and again by Sep 27; both mature before Dec 10. | Sep 27 |
Month by month in Fontana
| Month | What to do |
|---|---|
| January | Start indoors: Butternut Squash (Jan 7), Cantaloupe (Jan 7), Melons (Jan 7), Pumpkin (Jan 7), Spaghetti Squash (Jan 7), Watermelon (Jan 7), +2 more. Direct sow from: Potatoes (Jan 7), Sunflowers (Jan 21), Beans (Jan 28), Pole Beans (Jan 28). Transplant from: Calendula (Jan 7), Swiss Chard (Jan 7), Bok Choy (Jan 14), Cauliflower (Jan 14), Cosmos (Jan 21), Lavender (Jan 21), +15 more. Last frost around January 21. Last sowing dates: Garlic (Jan 14). |
| February | Transplant from: Butternut Squash (Feb 4), Cantaloupe (Feb 4), Cucumber (Feb 4), Eggplant (Feb 4), Melons (Feb 4), Pepper (Feb 4), +6 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 11), Pumpkin (Aug 11), Cantaloupe (Aug 19), Celery (Aug 19), Melons (Aug 19), Spaghetti Squash (Aug 21), +4 more. |
| September | Last sowing dates: Eggplant (Sep 3), Corn (Sep 5), Sunflowers (Sep 17), Brussel Sprouts (Sep 22), Pole Beans (Sep 22), Basil (Sep 27), +4 more. |
| October | Start indoors: Chives (Oct 29), Lavender (Oct 29), Onion (Oct 29), Rosemary (Oct 29). Last sowing dates: Nasturtiums (Oct 2), Okra (Oct 2), Yellow Squash (Oct 2), Zucchini (Oct 2), Cauliflower (Oct 3), Beans (Oct 4), +10 more. |
| November | Start indoors: Celery (Nov 12), Collards (Nov 12), Kale (Nov 12), Oregano (Nov 12), Parsley (Nov 12), Scallions (Nov 12), +8 more. Direct sow from: Arugula (Nov 26), Beets (Nov 26), Dill (Nov 26), Peas (Nov 26), Radish (Nov 26), Spinach (Nov 26). Last sowing dates: Collards (Nov 1), Scallions (Nov 1), Bok Choy (Nov 2), Lettuce (Nov 2), Kale (Nov 6), Kohlrabi (Nov 6), +4 more. |
| December | Start indoors: Eggplant (Dec 3), Calendula (Dec 10), Cauliflower (Dec 10), Marigolds (Dec 10), Pepper (Dec 10), Basil (Dec 17), +8 more. Direct sow from: Kohlrabi (Dec 10), Cilantro (Dec 24), Garlic (Dec 24), Turnip (Dec 24), Carrots (Dec 31). Transplant from: Broccoli (Dec 24), Brussel Sprouts (Dec 24), Cabbage (Dec 24), Collards (Dec 24), Kale (Dec 24), Lettuce (Dec 24), +2 more. Plant: Strawberry (Dec 17). First frost around December 24. |
Frequently Asked Questions
What is the last frost date for Fontana, CA (ZIP 92336)?
The median last spring frost date for Fontana, CA (ZIP code 92336) is around January 21. 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 Fontana, CA?
The median first fall frost date for Fontana, CA is around December 24. 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 21 in the earliest one-in-ten years, so cover tomatoes and peppers from then.
How long is the growing season in Fontana, CA?
The frost-free growing season in Fontana is about 337 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 Fontana (337 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 Fontana, CA?
Fontana, 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 Fontana, CA?
Start tomatoes indoors Dec 17 and plant out Feb 4 in Fontana. The planner uses the local median last frost and this crop's indoor-start and transplant offsets.
How many plantings of lettuce fit in Fontana?
Two: plant Dec 24 and again by Nov 2; both mature before Dec 31.
When do I plant garlic in Fontana?
Dec 24 to Jan 14; it overwinters and is ready the following summer.
Can I get two tomato crops in Fontana?
Yes: plant out Feb 4 for a summer crop, and set out a second round of transplants by Aug 24 for a fall crop.
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