Frost Dates for Clearlake, CA 95422
Last spring frost April 16 · First fall frost November 3 · 201 frost-free days · USDA Zone 9a
ZIP 95422 has about 17,100 people.
Long season: 201 frost-free days. Spring frost risk spans March 24–May 7 (44 days). Fall frost risk spans October 15–November 22 (38 days).
Frost probability for 95422
| Frost | 10% | 50% | 90% |
|---|---|---|---|
| Spring (last frost) | May 7 | April 16 | March 24 |
| Fall (first frost) | October 15 | November 3 | November 22 |
Dates come from NOAA 1971–2000 freeze probabilities at LAKEPORT (24.5 km away); the 50% date is the median year.
Which crops fit a 201-day season in Clearlake
In Clearlake (201 frost-free days, a 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 | Mar 12 | Apr 30–May 7 | 159 | fits: 80 days to maturity, 159 available after Apr 30. | Jul 4 |
| Pepper | Mar 5 | Apr 30–May 7 | 159 | fits: 75 days to maturity, 159 available after Apr 30. | Jul 9 |
| Lettuce | Feb 19 | Mar 19–Mar 26 | 236 | two-plantings: Plant Mar 19 and again by Sep 12; both mature before Nov 10. | Sep 12 |
| Carrots | — | Mar 26–Apr 2 | 243 | fits: 70 days to maturity, 243 available after Mar 26. | Sep 1 |
| Cucumber | Mar 26 | Apr 30–May 7 | 173 | two-plantings: Plant Apr 30 and again by Aug 7; both mature before Oct 20. | Aug 7 |
| Beans | — | Apr 23–May 7 | 187 | two-plantings: Plant Apr 23 and again by Aug 14; both mature before Oct 27. | Aug 14 |
| Peas | — | Feb 19–Apr 30 | 264 | fits: 65 days to maturity, 264 available after Feb 19. | Aug 23 |
| Zucchini | Apr 2 | Apr 30–May 7 | 173 | two-plantings: Plant Apr 30 and again by Aug 12; both mature before Oct 20. | Aug 12 |
| Onion | Jan 22 | Mar 19–Apr 2 | 236 | fits: 100 days to maturity, 236 available after Mar 19. | — |
| Spinach | — | Feb 19–Apr 9 | 278 | two-plantings: Plant Feb 19 and again by Oct 1; both mature before Nov 24. | Oct 1 |
| Kale | Feb 5 | Mar 19–Apr 2 | 250 | two-plantings: Plant Mar 19 and again by Sep 16; both mature before Nov 24. | Sep 16 |
| Broccoli | Feb 19 | Mar 19–Apr 2 | 236 | fits: 80 days to maturity, 236 available after Mar 19. | Aug 8 |
| Cabbage | Feb 19 | Mar 19–Apr 2 | 250 | fits: 70 days to maturity, 250 available after Mar 19. | Sep 1 |
| Radish | — | Feb 19–May 14 | 264 | two-plantings: Plant Feb 19 and again by Oct 2; both mature before Nov 10. | Oct 2 |
| Beets | — | Feb 19–May 14 | 264 | two-plantings: Plant Feb 19 and again by Sep 2; both mature before Nov 10. | Sep 2 |
| Potatoes | — | Apr 2–Apr 9 | 222 | fits: 90 days to maturity, 222 available after Apr 2. | — |
| Garlic | — | Nov 3 | 306 | overwinter: Plant Nov 3 to Nov 24; harvest the following summer. | Nov 24 |
| Strawberry | — | Mar 12–May 7 | 257 | perennial: A perennial: plant Mar 12; it fruits from the following year and keeps producing for several years. | — |
| Corn | Mar 19 | Apr 23–Apr 30 | 173 | fits: 75 days to maturity, 173 available after Apr 23. | Jul 16 |
| Pumpkin | Apr 2 | Apr 30–Apr 30 | 166 | fits: 100 days to maturity, 166 available after Apr 30. | Jun 21 |
| Cauliflower | Mar 5 | Apr 9–Apr 23 | 215 | fits: 75 days to maturity, 215 available after Apr 9. | Aug 13 |
| Swiss Chard | Feb 19 | Apr 2–Apr 2 | 222 | two-plantings: Plant Apr 2 and again by Sep 2; both mature before Nov 10. | Sep 2 |
| Arugula | — | Feb 19–May 14 | 278 | two-plantings: Plant Feb 19 and again by Oct 1; both mature before Nov 24. | Oct 1 |
| Brussel Sprouts | Feb 19 | Mar 19–Apr 2 | 250 | fits: 100 days to maturity, 250 available after Mar 19. | Aug 2 |
| Butternut Squash | Apr 2 | Apr 30–May 7 | 166 | fits: 100 days to maturity, 166 available after Apr 30. | Jun 21 |
| Eggplant | Feb 26 | Apr 30–May 7 | 159 | fits: 70 days to maturity, 159 available after Apr 30. | Jul 14 |
| Okra | Mar 19 | Apr 23–Apr 30 | 180 | two-plantings: Plant Apr 23 and again by Aug 12; both mature before Oct 20. | Aug 12 |
| Basil | Mar 12 | May 7–May 7 | 166 | two-plantings: Plant May 7 and again by Aug 7; both mature before Oct 20. | Aug 7 |
| Cilantro | — | Mar 19–Apr 9 | 236 | two-plantings: Plant Mar 19 and again by Sep 7; both mature before Nov 10. | Sep 7 |
| Parsley | Feb 5 | Apr 23–Apr 30 | 201 | fits: 70 days to maturity, 201 available after Apr 23. | Aug 18 |
| Celery | Feb 5 | Apr 23–May 7 | 201 | fits: 120 days to maturity, 201 available after Apr 23. | Jun 29 |
| Scallions | Feb 5 | Mar 19–Apr 2 | 250 | two-plantings: Plant Mar 19 and again by Sep 11; both mature before Nov 24. | Sep 11 |
| Turnip | — | Mar 19–Apr 2 | 250 | two-plantings: Plant Mar 19 and again by Sep 21; both mature before Nov 24. | Sep 21 |
| Kohlrabi | — | Mar 5–Mar 19 | 264 | two-plantings: Plant Mar 5 and again by Sep 16; both mature before Nov 24. | Sep 16 |
| Bok Choy | Mar 19 | Apr 9–Apr 16 | 215 | two-plantings: Plant Apr 9 and again by Sep 12; both mature before Nov 10. | Sep 12 |
| Collards | Feb 5 | Mar 19–Apr 2 | 250 | two-plantings: Plant Mar 19 and again by Sep 11; both mature before Nov 24. | Sep 11 |
| Cantaloupe | Apr 2 | Apr 30–May 7 | 159 | fits: 85 days to maturity, 159 available after Apr 30. | Jun 29 |
| Chives | Jan 22 | Apr 23–Apr 30 | 215 | fits: 90 days to maturity, 215 available after Apr 23. | — |
| Dill | — | Feb 19–May 14 | 264 | two-plantings: Plant Feb 19 and again by Sep 2; both mature before Nov 10. | Sep 2 |
| Oregano | Feb 5 | Apr 23–Apr 30 | 215 | fits: 80 days to maturity, 215 available after Apr 23. | — |
| Rosemary | Jan 22 | Apr 23–Apr 30 | 201 | fits: 80 days to maturity, 201 available after Apr 23. | — |
| Sage | Feb 19 | Apr 23–Apr 30 | 215 | fits: 75 days to maturity, 215 available after Apr 23. | — |
| Thyme | Feb 5 | Apr 23–Apr 30 | 215 | fits: 90 days to maturity, 215 available after Apr 23. | — |
| Calendula | Mar 5 | Apr 2–Apr 16 | 222 | two-plantings: Plant Apr 2 and again by Sep 7; both mature before Nov 10. | Sep 7 |
| Cosmos | Mar 19 | Apr 16–Apr 30 | 187 | two-plantings: Plant Apr 16 and again by Aug 7; both mature before Oct 20. | Aug 7 |
| Lavender | Jan 22 | Apr 16–Apr 30 | 222 | fits: 90 days to maturity, 222 available after Apr 16. | — |
| Marigolds | Mar 5 | Apr 16–Apr 23 | 187 | two-plantings: Plant Apr 16 and again by Aug 17; both mature before Oct 20. | Aug 17 |
| Melons | Apr 2 | Apr 30–May 7 | 159 | fits: 85 days to maturity, 159 available after Apr 30. | Jun 29 |
| Mint | — | Apr 16–Apr 30 | 222 | fits: 90 days to maturity, 222 available after Apr 16. | — |
| Nasturtiums | Mar 19 | Apr 16–Apr 23 | 187 | two-plantings: Plant Apr 16 and again by Aug 12; both mature before Oct 20. | Aug 12 |
| Pole Beans | — | Apr 23–May 7 | 180 | fits: 65 days to maturity, 180 available after Apr 23. | Aug 2 |
| Spaghetti Squash | Apr 2 | Apr 30–May 7 | 166 | fits: 90 days to maturity, 166 available after Apr 30. | Jul 1 |
| Sunflowers | — | Apr 16–Apr 30 | 187 | fits: 70 days to maturity, 187 available after Apr 16. | Jul 28 |
| Tomatillos | Feb 19 | Apr 23–Apr 30 | 166 | fits: 75 days to maturity, 166 available after Apr 23. | Jul 9 |
| Watermelon | Apr 2 | Apr 23–Apr 30 | 166 | fits: 80 days to maturity, 166 available after Apr 23. | Jul 4 |
| Yellow Squash | Apr 2 | Apr 30–May 7 | 173 | two-plantings: Plant Apr 30 and again by Aug 12; both mature before Oct 20. | Aug 12 |
| Zinnias | Mar 19 | Apr 16–Apr 30 | 187 | two-plantings: Plant Apr 16 and again by Aug 7; both mature before Oct 20. | Aug 7 |
Month by month in Clearlake
| Month | What to do |
|---|---|
| January | Start indoors: Chives (Jan 22), Lavender (Jan 22), Onion (Jan 22), Rosemary (Jan 22). |
| February | Start indoors: Celery (Feb 5), Collards (Feb 5), Kale (Feb 5), Oregano (Feb 5), Parsley (Feb 5), Scallions (Feb 5), +9 more. Direct sow from: Arugula (Feb 19), Beets (Feb 19), Dill (Feb 19), Peas (Feb 19), Radish (Feb 19), Spinach (Feb 19). |
| March | Start indoors: Calendula (Mar 5), Cauliflower (Mar 5), Marigolds (Mar 5), Pepper (Mar 5), Basil (Mar 12), Tomato (Mar 12), +7 more. Direct sow from: Kohlrabi (Mar 5), Cilantro (Mar 19), Turnip (Mar 19), Carrots (Mar 26). Transplant from: Broccoli (Mar 19), Brussel Sprouts (Mar 19), Cabbage (Mar 19), Collards (Mar 19), Kale (Mar 19), Lettuce (Mar 19), +2 more. Plant: Strawberry (Mar 12). |
| April | Start indoors: Butternut Squash (Apr 2), Cantaloupe (Apr 2), Melons (Apr 2), Pumpkin (Apr 2), Spaghetti Squash (Apr 2), Watermelon (Apr 2), +2 more. Direct sow from: Potatoes (Apr 2), Sunflowers (Apr 16), Beans (Apr 23), Pole Beans (Apr 23). Transplant from: Calendula (Apr 2), Swiss Chard (Apr 2), Bok Choy (Apr 9), Cauliflower (Apr 9), Cosmos (Apr 16), Lavender (Apr 16), +26 more. Last frost around April 16. |
| May | Transplant from: Basil (May 7). |
| June | Last sowing dates: Butternut Squash (Jun 21), Pumpkin (Jun 21), Cantaloupe (Jun 29), Celery (Jun 29), Melons (Jun 29). |
| July | Last sowing dates: Spaghetti Squash (Jul 1), Tomato (Jul 4), Watermelon (Jul 4), Pepper (Jul 9), Tomatillos (Jul 9), Eggplant (Jul 14), +2 more. |
| August | Last sowing dates: Brussel Sprouts (Aug 2), Pole Beans (Aug 2), Basil (Aug 7), Cosmos (Aug 7), Cucumber (Aug 7), Zinnias (Aug 7), +10 more. |
| September | Last sowing dates: Cabbage (Sep 1), Carrots (Sep 1), Beets (Sep 2), Dill (Sep 2), Swiss Chard (Sep 2), Calendula (Sep 7), +8 more. |
| October | Last sowing dates: Arugula (Oct 1), Spinach (Oct 1), Radish (Oct 2). |
| November | Direct sow from: Garlic (Nov 3). First frost around November 3. Last sowing dates: Garlic (Nov 24). |
| December | Harvest remaining cold-hardy crops: kale, carrots, and beets. Plant garlic bulbs for next year. |
Frequently Asked Questions
What is the last frost date for Clearlake, CA (ZIP 95422)?
The median last spring frost date for Clearlake, CA (ZIP code 95422) is around April 16. 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 March 24; one in ten it runs past May 7.
What is the first fall frost date in Clearlake, CA?
The median first fall frost date for Clearlake, CA is around November 3. 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 15 in the earliest one-in-ten years, so cover tomatoes and peppers from then.
How long is the growing season in Clearlake, CA?
The frost-free growing season in Clearlake is about 201 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 Clearlake (201 frost-free days, a long season), 30 of 56 planner crops fit outright, 25 get two plantings, 1 crop is perennial.
What USDA hardiness zone is Clearlake, CA?
Clearlake, CA is in USDA hardiness zone 9a (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 Clearlake, CA?
Start tomatoes indoors Mar 12 and plant out Apr 30 in Clearlake. The planner uses the local median last frost and this crop's indoor-start and transplant offsets.
How many plantings of lettuce fit in Clearlake?
Two: plant Mar 19 and again by Sep 12; both mature before Nov 10.
When do I plant garlic in Clearlake?
Nov 3 to Nov 24; it overwinters and is ready the following summer.
Can I get two tomato crops in Clearlake?
Yes: plant out Apr 30 for a summer crop, and set out a second round of transplants by Jul 4 for a fall crop.
Which nearby ZIP has a longer season?
Lakeport (ZIP 95453) has 243 frost-free days, 42 more than Clearlake (ZIP 95422). See Lakeport ZIP 95453 frost dates
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