Frost Dates for Healdsburg, CA 95448
Last spring frost February 21 · First fall frost November 23 · 275 frost-free days · USDA Zone 9b
ZIP 95448 has about 16,100 people.
Very long season: 275 frost-free days. Spring frost risk spans January 7–April 7 (90 days). Fall frost risk spans October 20–January 6 (78 days).
Frost probability for 95448
| Frost | 10% | 50% | 90% |
|---|---|---|---|
| Spring (last frost) | April 7 | February 21 | January 7 |
| Fall (first frost) | October 20 | November 23 | January 6 |
Dates come from NOAA 1971–2000 freeze probabilities at CLOVERDALE (22.3 km away); the 50% date is the median year.
Which crops fit a 275-day season in Healdsburg
In Healdsburg (275 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 | Jan 17 | Mar 7–Mar 14 | 233 | fits: 80 days to maturity, 233 available after Mar 7. | Jul 24 |
| Pepper | Jan 10 | Mar 7–Mar 14 | 233 | fits: 75 days to maturity, 233 available after Mar 7. | Jul 29 |
| Lettuce | Dec 27 | Jan 24–Jan 31 | 310 | two-plantings: Plant Jan 24 and again by Oct 2; both mature before Nov 30. | Oct 2 |
| Carrots | — | Jan 31–Feb 7 | 317 | fits: 70 days to maturity, 317 available after Jan 31. | Sep 21 |
| Cucumber | Jan 31 | Mar 7–Mar 14 | 247 | two-plantings: Plant Mar 7 and again by Aug 27; both mature before Nov 9. | Aug 27 |
| Beans | — | Feb 28–Mar 14 | 261 | two-plantings: Plant Feb 28 and again by Sep 3; both mature before Nov 16. | Sep 3 |
| Peas | — | Dec 27–Mar 7 | 338 | fits: 65 days to maturity, 338 available after Dec 27. | Sep 12 |
| Zucchini | Feb 7 | Mar 7–Mar 14 | 247 | two-plantings: Plant Mar 7 and again by Sep 1; both mature before Nov 9. | Sep 1 |
| Onion | Nov 29 | Jan 24–Feb 7 | 310 | fits: 100 days to maturity, 310 available after Jan 24. | — |
| Spinach | — | Dec 27–Feb 14 | 352 | two-plantings: Plant Dec 27 and again by Oct 21; both mature before Dec 14. | Oct 21 |
| Kale | Dec 13 | Jan 24–Feb 7 | 324 | two-plantings: Plant Jan 24 and again by Oct 6; both mature before Dec 14. | Oct 6 |
| Broccoli | Dec 27 | Jan 24–Feb 7 | 310 | fits: 80 days to maturity, 310 available after Jan 24. | Aug 28 |
| Cabbage | Dec 27 | Jan 24–Feb 7 | 324 | fits: 70 days to maturity, 324 available after Jan 24. | Sep 21 |
| Radish | — | Dec 27–Mar 21 | 338 | two-plantings: Plant Dec 27 and again by Oct 22; both mature before Nov 30. | Oct 22 |
| Beets | — | Dec 27–Mar 21 | 338 | two-plantings: Plant Dec 27 and again by Sep 22; both mature before Nov 30. | Sep 22 |
| Potatoes | — | Feb 7–Feb 14 | 296 | fits: 90 days to maturity, 296 available after Feb 7. | — |
| Garlic | — | Nov 23 | 380 | overwinter: Plant Nov 23 to Dec 14; harvest the following summer. | Dec 14 |
| Strawberry | — | Jan 17–Mar 14 | 331 | perennial: A perennial: plant Jan 17; it fruits from the following year and keeps producing for several years. | — |
| Corn | Jan 24 | Feb 28–Mar 7 | 247 | fits: 75 days to maturity, 247 available after Feb 28. | Aug 5 |
| Pumpkin | Feb 7 | Mar 7–Mar 7 | 240 | fits: 100 days to maturity, 240 available after Mar 7. | Jul 11 |
| Cauliflower | Jan 10 | Feb 14–Feb 28 | 289 | fits: 75 days to maturity, 289 available after Feb 14. | Sep 2 |
| Swiss Chard | Dec 27 | Feb 7–Feb 7 | 296 | two-plantings: Plant Feb 7 and again by Sep 22; both mature before Nov 30. | Sep 22 |
| Arugula | — | Dec 27–Mar 21 | 352 | two-plantings: Plant Dec 27 and again by Oct 21; both mature before Dec 14. | Oct 21 |
| Brussel Sprouts | Dec 27 | Jan 24–Feb 7 | 324 | fits: 100 days to maturity, 324 available after Jan 24. | Aug 22 |
| Butternut Squash | Feb 7 | Mar 7–Mar 14 | 240 | fits: 100 days to maturity, 240 available after Mar 7. | Jul 11 |
| Eggplant | Jan 3 | Mar 7–Mar 14 | 233 | fits: 70 days to maturity, 233 available after Mar 7. | Aug 3 |
| Okra | Jan 24 | Feb 28–Mar 7 | 254 | two-plantings: Plant Feb 28 and again by Sep 1; both mature before Nov 9. | Sep 1 |
| Basil | Jan 17 | Mar 14–Mar 14 | 240 | two-plantings: Plant Mar 14 and again by Aug 27; both mature before Nov 9. | Aug 27 |
| Cilantro | — | Jan 24–Feb 14 | 310 | two-plantings: Plant Jan 24 and again by Sep 27; both mature before Nov 30. | Sep 27 |
| Parsley | Dec 13 | Feb 28–Mar 7 | 275 | fits: 70 days to maturity, 275 available after Feb 28. | Sep 7 |
| Celery | Dec 13 | Feb 28–Mar 14 | 275 | fits: 120 days to maturity, 275 available after Feb 28. | Jul 19 |
| Scallions | Dec 13 | Jan 24–Feb 7 | 324 | two-plantings: Plant Jan 24 and again by Oct 1; both mature before Dec 14. | Oct 1 |
| Turnip | — | Jan 24–Feb 7 | 324 | two-plantings: Plant Jan 24 and again by Oct 11; both mature before Dec 14. | Oct 11 |
| Kohlrabi | — | Jan 10–Jan 24 | 338 | two-plantings: Plant Jan 10 and again by Oct 6; both mature before Dec 14. | Oct 6 |
| Bok Choy | Jan 24 | Feb 14–Feb 21 | 289 | two-plantings: Plant Feb 14 and again by Oct 2; both mature before Nov 30. | Oct 2 |
| Collards | Dec 13 | Jan 24–Feb 7 | 324 | two-plantings: Plant Jan 24 and again by Oct 1; both mature before Dec 14. | Oct 1 |
| Cantaloupe | Feb 7 | Mar 7–Mar 14 | 233 | fits: 85 days to maturity, 233 available after Mar 7. | Jul 19 |
| Chives | Nov 29 | Feb 28–Mar 7 | 289 | fits: 90 days to maturity, 289 available after Feb 28. | — |
| Dill | — | Dec 27–Mar 21 | 338 | two-plantings: Plant Dec 27 and again by Sep 22; both mature before Nov 30. | Sep 22 |
| Oregano | Dec 13 | Feb 28–Mar 7 | 289 | fits: 80 days to maturity, 289 available after Feb 28. | — |
| Rosemary | Nov 29 | Feb 28–Mar 7 | 275 | fits: 80 days to maturity, 275 available after Feb 28. | — |
| Sage | Dec 27 | Feb 28–Mar 7 | 289 | fits: 75 days to maturity, 289 available after Feb 28. | — |
| Thyme | Dec 13 | Feb 28–Mar 7 | 289 | fits: 90 days to maturity, 289 available after Feb 28. | — |
| Calendula | Jan 10 | Feb 7–Feb 21 | 296 | two-plantings: Plant Feb 7 and again by Sep 27; both mature before Nov 30. | Sep 27 |
| Cosmos | Jan 24 | Feb 21–Mar 7 | 261 | two-plantings: Plant Feb 21 and again by Aug 27; both mature before Nov 9. | Aug 27 |
| Lavender | Nov 29 | Feb 21–Mar 7 | 296 | fits: 90 days to maturity, 296 available after Feb 21. | — |
| Marigolds | Jan 10 | Feb 21–Feb 28 | 261 | two-plantings: Plant Feb 21 and again by Sep 6; both mature before Nov 9. | Sep 6 |
| Melons | Feb 7 | Mar 7–Mar 14 | 233 | fits: 85 days to maturity, 233 available after Mar 7. | Jul 19 |
| Mint | — | Feb 21–Mar 7 | 296 | fits: 90 days to maturity, 296 available after Feb 21. | — |
| Nasturtiums | Jan 24 | Feb 21–Feb 28 | 261 | two-plantings: Plant Feb 21 and again by Sep 1; both mature before Nov 9. | Sep 1 |
| Pole Beans | — | Feb 28–Mar 14 | 254 | fits: 65 days to maturity, 254 available after Feb 28. | Aug 22 |
| Spaghetti Squash | Feb 7 | Mar 7–Mar 14 | 240 | fits: 90 days to maturity, 240 available after Mar 7. | Jul 21 |
| Sunflowers | — | Feb 21–Mar 7 | 261 | fits: 70 days to maturity, 261 available after Feb 21. | Aug 17 |
| Tomatillos | Dec 27 | Feb 28–Mar 7 | 240 | fits: 75 days to maturity, 240 available after Feb 28. | Jul 29 |
| Watermelon | Feb 7 | Feb 28–Mar 7 | 240 | fits: 80 days to maturity, 240 available after Feb 28. | Jul 24 |
| Yellow Squash | Feb 7 | Mar 7–Mar 14 | 247 | two-plantings: Plant Mar 7 and again by Sep 1; both mature before Nov 9. | Sep 1 |
| Zinnias | Jan 24 | Feb 21–Mar 7 | 261 | two-plantings: Plant Feb 21 and again by Aug 27; both mature before Nov 9. | Aug 27 |
Month by month in Healdsburg
| Month | What to do |
|---|---|
| January | Start indoors: Eggplant (Jan 3), Calendula (Jan 10), Cauliflower (Jan 10), Marigolds (Jan 10), Pepper (Jan 10), Basil (Jan 17), +8 more. Direct sow from: Kohlrabi (Jan 10), Cilantro (Jan 24), Turnip (Jan 24), Carrots (Jan 31). Transplant from: Broccoli (Jan 24), Brussel Sprouts (Jan 24), Cabbage (Jan 24), Collards (Jan 24), Kale (Jan 24), Lettuce (Jan 24), +2 more. Plant: Strawberry (Jan 17). |
| February | Start indoors: Butternut Squash (Feb 7), Cantaloupe (Feb 7), Melons (Feb 7), Pumpkin (Feb 7), Spaghetti Squash (Feb 7), Watermelon (Feb 7), +2 more. Direct sow from: Potatoes (Feb 7), Sunflowers (Feb 21), Beans (Feb 28), Pole Beans (Feb 28). Transplant from: Calendula (Feb 7), Swiss Chard (Feb 7), Bok Choy (Feb 14), Cauliflower (Feb 14), Cosmos (Feb 21), Lavender (Feb 21), +15 more. Last frost around February 21. |
| March | Transplant from: Butternut Squash (Mar 7), Cantaloupe (Mar 7), Cucumber (Mar 7), Eggplant (Mar 7), Melons (Mar 7), Pepper (Mar 7), +6 more. |
| April | Succession plant lettuce and greens. Keep beds weeded and watered consistently. |
| May | Harvest regularly to encourage production. Monitor for pests and disease. |
| June | Midsummer: harvest beans, zucchini, cucumbers. Start brassica seeds indoors for fall. |
| July | Last sowing dates: Butternut Squash (Jul 11), Pumpkin (Jul 11), Cantaloupe (Jul 19), Celery (Jul 19), Melons (Jul 19), Spaghetti Squash (Jul 21), +4 more. |
| August | Last sowing dates: Eggplant (Aug 3), Corn (Aug 5), Sunflowers (Aug 17), Brussel Sprouts (Aug 22), Pole Beans (Aug 22), Basil (Aug 27), +4 more. |
| September | Last sowing dates: Nasturtiums (Sep 1), Okra (Sep 1), Yellow Squash (Sep 1), Zucchini (Sep 1), Cauliflower (Sep 2), Beans (Sep 3), +10 more. |
| October | Last sowing dates: Collards (Oct 1), Scallions (Oct 1), Bok Choy (Oct 2), Lettuce (Oct 2), Kale (Oct 6), Kohlrabi (Oct 6), +4 more. |
| November | Start indoors: Chives (Nov 29), Lavender (Nov 29), Onion (Nov 29), Rosemary (Nov 29). Direct sow from: Garlic (Nov 23). First frost around November 23. |
| December | Start indoors: Celery (Dec 13), Collards (Dec 13), Kale (Dec 13), Oregano (Dec 13), Parsley (Dec 13), Scallions (Dec 13), +8 more. Direct sow from: Arugula (Dec 27), Beets (Dec 27), Dill (Dec 27), Peas (Dec 27), Radish (Dec 27), Spinach (Dec 27). Last sowing dates: Garlic (Dec 14). |
Frequently Asked Questions
What is the last frost date for Healdsburg, CA (ZIP 95448)?
The median last spring frost date for Healdsburg, CA (ZIP code 95448) is around February 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. One year in ten frost ends before January 7; one in ten it runs past April 7.
What is the first fall frost date in Healdsburg, CA?
The median first fall frost date for Healdsburg, CA is around November 23. 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 20 in the earliest one-in-ten years, so cover tomatoes and peppers from then.
How long is the growing season in Healdsburg, CA?
The frost-free growing season in Healdsburg is about 275 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 Healdsburg (275 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 Healdsburg, CA?
Healdsburg, 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 Healdsburg, CA?
Start tomatoes indoors Jan 17 and plant out Mar 7 in Healdsburg. The planner uses the local median last frost and this crop's indoor-start and transplant offsets.
How many plantings of lettuce fit in Healdsburg?
Two: plant Jan 24 and again by Oct 2; both mature before Nov 30.
When do I plant garlic in Healdsburg?
Nov 23 to Dec 14; it overwinters and is ready the following summer.
Can I get two tomato crops in Healdsburg?
Yes: plant out Mar 7 for a summer crop, and set out a second round of transplants by Jul 24 for a fall crop.
Which nearby ZIP has a longer season?
Windsor (ZIP 95492) has 289 frost-free days, 14 more than Healdsburg (ZIP 95448). See Windsor ZIP 95492 frost dates
Nearby and related
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