Frost Dates for Napa, CA 94558
Last spring frost March 10 · First fall frost November 29 · 264 frost-free days · USDA Zone 9b
ZIP 94558 has about 63,700 people, the largest of 2 ZIP codes in Napa.
Very long season: 264 frost-free days. Spring frost risk spans February 7–April 21 (73 days). Fall frost risk spans October 29–December 19 (51 days).
Frost probability for 94558
| Frost | 10% | 50% | 90% |
|---|---|---|---|
| Spring (last frost) | April 21 | March 10 | February 7 |
| Fall (first frost) | October 29 | November 29 | December 19 |
Dates come from NOAA 1971–2000 freeze probabilities at MARKLEY COVE (12.4 km away); the 50% date is the median year.
Frost dates by ZIP code in Napa, CA
| ZIP | Last spring frost (50%) | First fall frost (50%) | Zone |
|---|---|---|---|
| 94558 | March 10 | November 29 | 9b |
| 94559 | February 22 | December 5 | 9b |
Which crops fit a 264-day season in Napa
In Napa (264 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 | Feb 3 | Mar 24–Mar 31 | 222 | fits: 80 days to maturity, 222 available after Mar 24. | Jul 30 |
| Pepper | Jan 27 | Mar 24–Mar 31 | 222 | fits: 75 days to maturity, 222 available after Mar 24. | Aug 4 |
| Lettuce | Jan 13 | Feb 10–Feb 17 | 299 | two-plantings: Plant Feb 10 and again by Oct 8; both mature before Dec 6. | Oct 8 |
| Carrots | — | Feb 17–Feb 24 | 306 | fits: 70 days to maturity, 306 available after Feb 17. | Sep 27 |
| Cucumber | Feb 17 | Mar 24–Mar 31 | 236 | two-plantings: Plant Mar 24 and again by Sep 2; both mature before Nov 15. | Sep 2 |
| Beans | — | Mar 17–Mar 31 | 250 | two-plantings: Plant Mar 17 and again by Sep 9; both mature before Nov 22. | Sep 9 |
| Peas | — | Jan 13–Mar 24 | 327 | fits: 65 days to maturity, 327 available after Jan 13. | Sep 18 |
| Zucchini | Feb 24 | Mar 24–Mar 31 | 236 | two-plantings: Plant Mar 24 and again by Sep 7; both mature before Nov 15. | Sep 7 |
| Onion | Dec 16 | Feb 10–Feb 24 | 299 | fits: 100 days to maturity, 299 available after Feb 10. | — |
| Spinach | — | Jan 13–Mar 3 | 341 | two-plantings: Plant Jan 13 and again by Oct 27; both mature before Dec 20. | Oct 27 |
| Kale | Dec 30 | Feb 10–Feb 24 | 313 | two-plantings: Plant Feb 10 and again by Oct 12; both mature before Dec 20. | Oct 12 |
| Broccoli | Jan 13 | Feb 10–Feb 24 | 299 | fits: 80 days to maturity, 299 available after Feb 10. | Sep 3 |
| Cabbage | Jan 13 | Feb 10–Feb 24 | 313 | fits: 70 days to maturity, 313 available after Feb 10. | Sep 27 |
| Radish | — | Jan 13–Apr 7 | 327 | two-plantings: Plant Jan 13 and again by Oct 28; both mature before Dec 6. | Oct 28 |
| Beets | — | Jan 13–Apr 7 | 327 | two-plantings: Plant Jan 13 and again by Sep 28; both mature before Dec 6. | Sep 28 |
| Potatoes | — | Feb 24–Mar 3 | 285 | fits: 90 days to maturity, 285 available after Feb 24. | — |
| Garlic | — | Nov 29 | 369 | overwinter: Plant Nov 29 to Dec 20; harvest the following summer. | Dec 20 |
| Strawberry | — | Feb 3–Mar 31 | 320 | perennial: A perennial: plant Feb 3; it fruits from the following year and keeps producing for several years. | — |
| Corn | Feb 10 | Mar 17–Mar 24 | 236 | fits: 75 days to maturity, 236 available after Mar 17. | Aug 11 |
| Pumpkin | Feb 24 | Mar 24–Mar 24 | 229 | fits: 100 days to maturity, 229 available after Mar 24. | Jul 17 |
| Cauliflower | Jan 27 | Mar 3–Mar 17 | 278 | fits: 75 days to maturity, 278 available after Mar 3. | Sep 8 |
| Swiss Chard | Jan 13 | Feb 24–Feb 24 | 285 | two-plantings: Plant Feb 24 and again by Sep 28; both mature before Dec 6. | Sep 28 |
| Arugula | — | Jan 13–Apr 7 | 341 | two-plantings: Plant Jan 13 and again by Oct 27; both mature before Dec 20. | Oct 27 |
| Brussel Sprouts | Jan 13 | Feb 10–Feb 24 | 313 | fits: 100 days to maturity, 313 available after Feb 10. | Aug 28 |
| Butternut Squash | Feb 24 | Mar 24–Mar 31 | 229 | fits: 100 days to maturity, 229 available after Mar 24. | Jul 17 |
| Eggplant | Jan 20 | Mar 24–Mar 31 | 222 | fits: 70 days to maturity, 222 available after Mar 24. | Aug 9 |
| Okra | Feb 10 | Mar 17–Mar 24 | 243 | two-plantings: Plant Mar 17 and again by Sep 7; both mature before Nov 15. | Sep 7 |
| Basil | Feb 3 | Mar 31–Mar 31 | 229 | two-plantings: Plant Mar 31 and again by Sep 2; both mature before Nov 15. | Sep 2 |
| Cilantro | — | Feb 10–Mar 3 | 299 | two-plantings: Plant Feb 10 and again by Oct 3; both mature before Dec 6. | Oct 3 |
| Parsley | Dec 30 | Mar 17–Mar 24 | 264 | fits: 70 days to maturity, 264 available after Mar 17. | Sep 13 |
| Celery | Dec 30 | Mar 17–Mar 31 | 264 | fits: 120 days to maturity, 264 available after Mar 17. | Jul 25 |
| Scallions | Dec 30 | Feb 10–Feb 24 | 313 | two-plantings: Plant Feb 10 and again by Oct 7; both mature before Dec 20. | Oct 7 |
| Turnip | — | Feb 10–Feb 24 | 313 | two-plantings: Plant Feb 10 and again by Oct 17; both mature before Dec 20. | Oct 17 |
| Kohlrabi | — | Jan 27–Feb 10 | 327 | two-plantings: Plant Jan 27 and again by Oct 12; both mature before Dec 20. | Oct 12 |
| Bok Choy | Feb 10 | Mar 3–Mar 10 | 278 | two-plantings: Plant Mar 3 and again by Oct 8; both mature before Dec 6. | Oct 8 |
| Collards | Dec 30 | Feb 10–Feb 24 | 313 | two-plantings: Plant Feb 10 and again by Oct 7; both mature before Dec 20. | Oct 7 |
| Cantaloupe | Feb 24 | Mar 24–Mar 31 | 222 | fits: 85 days to maturity, 222 available after Mar 24. | Jul 25 |
| Chives | Dec 16 | Mar 17–Mar 24 | 278 | fits: 90 days to maturity, 278 available after Mar 17. | — |
| Dill | — | Jan 13–Apr 7 | 327 | two-plantings: Plant Jan 13 and again by Sep 28; both mature before Dec 6. | Sep 28 |
| Oregano | Dec 30 | Mar 17–Mar 24 | 278 | fits: 80 days to maturity, 278 available after Mar 17. | — |
| Rosemary | Dec 16 | Mar 17–Mar 24 | 264 | fits: 80 days to maturity, 264 available after Mar 17. | — |
| Sage | Jan 13 | Mar 17–Mar 24 | 278 | fits: 75 days to maturity, 278 available after Mar 17. | — |
| Thyme | Dec 30 | Mar 17–Mar 24 | 278 | fits: 90 days to maturity, 278 available after Mar 17. | — |
| Calendula | Jan 27 | Feb 24–Mar 10 | 285 | two-plantings: Plant Feb 24 and again by Oct 3; both mature before Dec 6. | Oct 3 |
| Cosmos | Feb 10 | Mar 10–Mar 24 | 250 | two-plantings: Plant Mar 10 and again by Sep 2; both mature before Nov 15. | Sep 2 |
| Lavender | Dec 16 | Mar 10–Mar 24 | 285 | fits: 90 days to maturity, 285 available after Mar 10. | — |
| Marigolds | Jan 27 | Mar 10–Mar 17 | 250 | two-plantings: Plant Mar 10 and again by Sep 12; both mature before Nov 15. | Sep 12 |
| Melons | Feb 24 | Mar 24–Mar 31 | 222 | fits: 85 days to maturity, 222 available after Mar 24. | Jul 25 |
| Mint | — | Mar 10–Mar 24 | 285 | fits: 90 days to maturity, 285 available after Mar 10. | — |
| Nasturtiums | Feb 10 | Mar 10–Mar 17 | 250 | two-plantings: Plant Mar 10 and again by Sep 7; both mature before Nov 15. | Sep 7 |
| Pole Beans | — | Mar 17–Mar 31 | 243 | fits: 65 days to maturity, 243 available after Mar 17. | Aug 28 |
| Spaghetti Squash | Feb 24 | Mar 24–Mar 31 | 229 | fits: 90 days to maturity, 229 available after Mar 24. | Jul 27 |
| Sunflowers | — | Mar 10–Mar 24 | 250 | fits: 70 days to maturity, 250 available after Mar 10. | Aug 23 |
| Tomatillos | Jan 13 | Mar 17–Mar 24 | 229 | fits: 75 days to maturity, 229 available after Mar 17. | Aug 4 |
| Watermelon | Feb 24 | Mar 17–Mar 24 | 229 | fits: 80 days to maturity, 229 available after Mar 17. | Jul 30 |
| Yellow Squash | Feb 24 | Mar 24–Mar 31 | 236 | two-plantings: Plant Mar 24 and again by Sep 7; both mature before Nov 15. | Sep 7 |
| Zinnias | Feb 10 | Mar 10–Mar 24 | 250 | two-plantings: Plant Mar 10 and again by Sep 2; both mature before Nov 15. | Sep 2 |
Month by month in Napa
| Month | What to do |
|---|---|
| January | Start indoors: Broccoli (Jan 13), Brussel Sprouts (Jan 13), Cabbage (Jan 13), Lettuce (Jan 13), Sage (Jan 13), Swiss Chard (Jan 13), +6 more. Direct sow from: Arugula (Jan 13), Beets (Jan 13), Dill (Jan 13), Peas (Jan 13), Radish (Jan 13), Spinach (Jan 13), +1 more. |
| February | Start indoors: Basil (Feb 3), Tomato (Feb 3), Bok Choy (Feb 10), Corn (Feb 10), Cosmos (Feb 10), Nasturtiums (Feb 10), +11 more. Direct sow from: Cilantro (Feb 10), Turnip (Feb 10), Carrots (Feb 17), Potatoes (Feb 24). Transplant from: Broccoli (Feb 10), Brussel Sprouts (Feb 10), Cabbage (Feb 10), Collards (Feb 10), Kale (Feb 10), Lettuce (Feb 10), +4 more. Plant: Strawberry (Feb 3). |
| March | Direct sow from: Sunflowers (Mar 10), Beans (Mar 17), Pole Beans (Mar 17). Transplant from: Bok Choy (Mar 3), Cauliflower (Mar 3), Cosmos (Mar 10), Lavender (Mar 10), Marigolds (Mar 10), Mint (Mar 10), +25 more. Last frost around March 10. |
| April | Frost has passed. Transplant tomatoes, peppers, and basil outdoors. Direct sow beans, cucumbers, squash, and zucchini. |
| May | Succession plant lettuce and greens. Keep beds weeded and watered consistently. |
| June | Harvest regularly to encourage production. Monitor for pests and disease. |
| July | Last sowing dates: Butternut Squash (Jul 17), Pumpkin (Jul 17), Cantaloupe (Jul 25), Celery (Jul 25), Melons (Jul 25), Spaghetti Squash (Jul 27), +2 more. |
| August | Last sowing dates: Pepper (Aug 4), Tomatillos (Aug 4), Eggplant (Aug 9), Corn (Aug 11), Sunflowers (Aug 23), Brussel Sprouts (Aug 28), +1 more. |
| September | Last sowing dates: Basil (Sep 2), Cosmos (Sep 2), Cucumber (Sep 2), Zinnias (Sep 2), Broccoli (Sep 3), Nasturtiums (Sep 7), +13 more. |
| October | Last sowing dates: Calendula (Oct 3), Cilantro (Oct 3), Collards (Oct 7), Scallions (Oct 7), Bok Choy (Oct 8), Lettuce (Oct 8), +6 more. |
| November | Direct sow from: Garlic (Nov 29). First frost around November 29. |
| December | Start indoors: Chives (Dec 16), Lavender (Dec 16), Onion (Dec 16), Rosemary (Dec 16), Celery (Dec 30), Collards (Dec 30), +5 more. Last sowing dates: Garlic (Dec 20). |
Frequently Asked Questions
What is the last frost date for Napa, CA (ZIP 94558)?
The median last spring frost date for Napa, CA (ZIP code 94558) is around March 10. 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. One year in ten frost ends before February 7; one in ten it runs past April 21.
What is the first fall frost date in Napa, CA?
The median first fall frost date for Napa, CA is around November 29. 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 October 29 in the earliest one-in-ten years, so cover tomatoes and peppers from then.
How long is the growing season in Napa, CA?
The frost-free growing season in Napa is about 264 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 Napa (264 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 Napa, CA?
Napa, CA is in USDA hardiness zone 9b (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 Napa, CA?
Start tomatoes indoors Feb 3 and plant out Mar 24 in Napa. The planner uses the local median last frost and this crop's indoor-start and transplant offsets.
How many plantings of lettuce fit in Napa?
Two: plant Feb 10 and again by Oct 8; both mature before Dec 6.
When do I plant garlic in Napa?
Nov 29 to Dec 20; it overwinters and is ready the following summer.
Can I get two tomato crops in Napa?
Yes: plant out Mar 24 for a summer crop, and set out a second round of transplants by Jul 30 for a fall crop.
Which nearby ZIP has a longer season?
Winters (ZIP 95694) has 272 frost-free days, 8 more than Napa (ZIP 94558). See Winters ZIP 95694 frost dates
Nearby and related
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