Frost Dates for Mill Valley, CA 94941
Last spring frost February 1 · First fall frost January 2 · 335 frost-free days · USDA Zone 10a
ZIP 94941 has about 32,700 people.
Very long season: 335 frost-free days.
Frost probability for 94941
| Frost | 10% | 50% | 90% |
|---|---|---|---|
| Spring (last frost) | March 15 | February 1 | — |
| Fall (first frost) | November 19 | January 2 | — |
Dates come from NOAA 1971–2000 freeze probabilities at KENTFIELD (6.0 km away); the 50% date is the median year.
Which crops fit a 335-day season in Mill Valley
In Mill Valley (335 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 28 | Feb 15–Feb 22 | 293 | fits: 80 days to maturity, 293 available after Feb 15. | Sep 2 |
| Pepper | Dec 21 | Feb 15–Feb 22 | 293 | fits: 75 days to maturity, 293 available after Feb 15. | Sep 7 |
| Lettuce | Dec 7 | Jan 4–Jan 11 | 370 | two-plantings: Plant Jan 4 and again by Nov 11; both mature before Jan 9. | Nov 11 |
| Carrots | — | Jan 11–Jan 18 | 377 | fits: 70 days to maturity, 377 available after Jan 11. | Oct 31 |
| Cucumber | Jan 11 | Feb 15–Feb 22 | 307 | two-plantings: Plant Feb 15 and again by Oct 6; both mature before Dec 19. | Oct 6 |
| Beans | — | Feb 8–Feb 22 | 321 | two-plantings: Plant Feb 8 and again by Oct 13; both mature before Dec 26. | Oct 13 |
| Peas | — | Dec 7–Feb 15 | 398 | fits: 65 days to maturity, 398 available after Dec 7. | Oct 22 |
| Zucchini | Jan 18 | Feb 15–Feb 22 | 307 | two-plantings: Plant Feb 15 and again by Oct 11; both mature before Dec 19. | Oct 11 |
| Onion | Nov 9 | Jan 4–Jan 18 | 370 | fits: 100 days to maturity, 370 available after Jan 4. | — |
| Spinach | — | Dec 7–Jan 25 | 412 | two-plantings: Plant Dec 7 and again by Nov 30; both mature before Jan 23. | Nov 30 |
| Kale | Nov 23 | Jan 4–Jan 18 | 384 | two-plantings: Plant Jan 4 and again by Nov 15; both mature before Jan 23. | Nov 15 |
| Broccoli | Dec 7 | Jan 4–Jan 18 | 370 | fits: 80 days to maturity, 370 available after Jan 4. | Oct 7 |
| Cabbage | Dec 7 | Jan 4–Jan 18 | 384 | fits: 70 days to maturity, 384 available after Jan 4. | Oct 31 |
| Radish | — | Dec 7–Mar 1 | 398 | two-plantings: Plant Dec 7 and again by Dec 1; both mature before Jan 9. | Dec 1 |
| Beets | — | Dec 7–Mar 1 | 398 | two-plantings: Plant Dec 7 and again by Nov 1; both mature before Jan 9. | Nov 1 |
| Potatoes | — | Jan 18–Jan 25 | 356 | fits: 90 days to maturity, 356 available after Jan 18. | — |
| Garlic | — | Jan 2 | 440 | overwinter: Plant Jan 2 to Jan 23; harvest the following summer. | Jan 23 |
| Strawberry | — | Dec 28–Feb 22 | 391 | perennial: A perennial: plant Dec 28; it fruits from the following year and keeps producing for several years. | — |
| Corn | Jan 4 | Feb 8–Feb 15 | 307 | fits: 75 days to maturity, 307 available after Feb 8. | Sep 14 |
| Pumpkin | Jan 18 | Feb 15–Feb 15 | 300 | fits: 100 days to maturity, 300 available after Feb 15. | Aug 20 |
| Cauliflower | Dec 21 | Jan 25–Feb 8 | 349 | fits: 75 days to maturity, 349 available after Jan 25. | Oct 12 |
| Swiss Chard | Dec 7 | Jan 18–Jan 18 | 356 | two-plantings: Plant Jan 18 and again by Nov 1; both mature before Jan 9. | Nov 1 |
| Arugula | — | Dec 7–Mar 1 | 412 | two-plantings: Plant Dec 7 and again by Nov 30; both mature before Jan 23. | Nov 30 |
| Brussel Sprouts | Dec 7 | Jan 4–Jan 18 | 384 | fits: 100 days to maturity, 384 available after Jan 4. | Oct 1 |
| Butternut Squash | Jan 18 | Feb 15–Feb 22 | 300 | fits: 100 days to maturity, 300 available after Feb 15. | Aug 20 |
| Eggplant | Dec 14 | Feb 15–Feb 22 | 293 | fits: 70 days to maturity, 293 available after Feb 15. | Sep 12 |
| Okra | Jan 4 | Feb 8–Feb 15 | 314 | two-plantings: Plant Feb 8 and again by Oct 11; both mature before Dec 19. | Oct 11 |
| Basil | Dec 28 | Feb 22–Feb 22 | 300 | two-plantings: Plant Feb 22 and again by Oct 6; both mature before Dec 19. | Oct 6 |
| Cilantro | — | Jan 4–Jan 25 | 370 | two-plantings: Plant Jan 4 and again by Nov 6; both mature before Jan 9. | Nov 6 |
| Parsley | Nov 23 | Feb 8–Feb 15 | 335 | fits: 70 days to maturity, 335 available after Feb 8. | Oct 17 |
| Celery | Nov 23 | Feb 8–Feb 22 | 335 | fits: 120 days to maturity, 335 available after Feb 8. | Aug 28 |
| Scallions | Nov 23 | Jan 4–Jan 18 | 384 | two-plantings: Plant Jan 4 and again by Nov 10; both mature before Jan 23. | Nov 10 |
| Turnip | — | Jan 4–Jan 18 | 384 | two-plantings: Plant Jan 4 and again by Nov 20; both mature before Jan 23. | Nov 20 |
| Kohlrabi | — | Dec 21–Jan 4 | 398 | two-plantings: Plant Dec 21 and again by Nov 15; both mature before Jan 23. | Nov 15 |
| Bok Choy | Jan 4 | Jan 25–Feb 1 | 349 | two-plantings: Plant Jan 25 and again by Nov 11; both mature before Jan 9. | Nov 11 |
| Collards | Nov 23 | Jan 4–Jan 18 | 384 | two-plantings: Plant Jan 4 and again by Nov 10; both mature before Jan 23. | Nov 10 |
| Cantaloupe | Jan 18 | Feb 15–Feb 22 | 293 | fits: 85 days to maturity, 293 available after Feb 15. | Aug 28 |
| Chives | Nov 9 | Feb 8–Feb 15 | 349 | fits: 90 days to maturity, 349 available after Feb 8. | — |
| Dill | — | Dec 7–Mar 1 | 398 | two-plantings: Plant Dec 7 and again by Nov 1; both mature before Jan 9. | Nov 1 |
| Oregano | Nov 23 | Feb 8–Feb 15 | 349 | fits: 80 days to maturity, 349 available after Feb 8. | — |
| Rosemary | Nov 9 | Feb 8–Feb 15 | 335 | fits: 80 days to maturity, 335 available after Feb 8. | — |
| Sage | Dec 7 | Feb 8–Feb 15 | 349 | fits: 75 days to maturity, 349 available after Feb 8. | — |
| Thyme | Nov 23 | Feb 8–Feb 15 | 349 | fits: 90 days to maturity, 349 available after Feb 8. | — |
| Calendula | Dec 21 | Jan 18–Feb 1 | 356 | two-plantings: Plant Jan 18 and again by Nov 6; both mature before Jan 9. | Nov 6 |
| Cosmos | Jan 4 | Feb 1–Feb 15 | 321 | two-plantings: Plant Feb 1 and again by Oct 6; both mature before Dec 19. | Oct 6 |
| Lavender | Nov 9 | Feb 1–Feb 15 | 356 | fits: 90 days to maturity, 356 available after Feb 1. | — |
| Marigolds | Dec 21 | Feb 1–Feb 8 | 321 | two-plantings: Plant Feb 1 and again by Oct 16; both mature before Dec 19. | Oct 16 |
| Melons | Jan 18 | Feb 15–Feb 22 | 293 | fits: 85 days to maturity, 293 available after Feb 15. | Aug 28 |
| Mint | — | Feb 1–Feb 15 | 356 | fits: 90 days to maturity, 356 available after Feb 1. | — |
| Nasturtiums | Jan 4 | Feb 1–Feb 8 | 321 | two-plantings: Plant Feb 1 and again by Oct 11; both mature before Dec 19. | Oct 11 |
| Pole Beans | — | Feb 8–Feb 22 | 314 | fits: 65 days to maturity, 314 available after Feb 8. | Oct 1 |
| Spaghetti Squash | Jan 18 | Feb 15–Feb 22 | 300 | fits: 90 days to maturity, 300 available after Feb 15. | Aug 30 |
| Sunflowers | — | Feb 1–Feb 15 | 321 | fits: 70 days to maturity, 321 available after Feb 1. | Sep 26 |
| Tomatillos | Dec 7 | Feb 8–Feb 15 | 300 | fits: 75 days to maturity, 300 available after Feb 8. | Sep 7 |
| Watermelon | Jan 18 | Feb 8–Feb 15 | 300 | fits: 80 days to maturity, 300 available after Feb 8. | Sep 2 |
| Yellow Squash | Jan 18 | Feb 15–Feb 22 | 307 | two-plantings: Plant Feb 15 and again by Oct 11; both mature before Dec 19. | Oct 11 |
| Zinnias | Jan 4 | Feb 1–Feb 15 | 321 | two-plantings: Plant Feb 1 and again by Oct 6; both mature before Dec 19. | Oct 6 |
Month by month in Mill Valley
| Month | What to do |
|---|---|
| January | Start indoors: Bok Choy (Jan 4), Corn (Jan 4), Cosmos (Jan 4), Nasturtiums (Jan 4), Okra (Jan 4), Zinnias (Jan 4), +9 more. Direct sow from: Garlic (Jan 2), Cilantro (Jan 4), Turnip (Jan 4), Carrots (Jan 11), Potatoes (Jan 18). Transplant from: Broccoli (Jan 4), Brussel Sprouts (Jan 4), Cabbage (Jan 4), Collards (Jan 4), Kale (Jan 4), Lettuce (Jan 4), +6 more. First frost around January 2. Last sowing dates: Garlic (Jan 23). |
| February | Direct sow from: Sunflowers (Feb 1), Beans (Feb 8), Pole Beans (Feb 8). Transplant from: Cosmos (Feb 1), Lavender (Feb 1), Marigolds (Feb 1), Mint (Feb 1), Nasturtiums (Feb 1), Zinnias (Feb 1), +23 more. Last frost around February 1. |
| March | Transplant warm-season crops outdoors. Sow beans, cucumbers, and squash. |
| April | Main warm-season planting window. Direct sow melons and sweet corn. |
| May | Succession plant lettuce. Keep beds irrigated as temperatures climb. |
| June | Monitor for heat stress. Harvest zucchini and cucumbers frequently. |
| July | Harvest regularly to encourage continued production. Watch for pests. |
| August | Last sowing dates: Butternut Squash (Aug 20), Pumpkin (Aug 20), Cantaloupe (Aug 28), Celery (Aug 28), Melons (Aug 28), Spaghetti Squash (Aug 30). |
| September | Last sowing dates: Tomato (Sep 2), Watermelon (Sep 2), Pepper (Sep 7), Tomatillos (Sep 7), Eggplant (Sep 12), Corn (Sep 14), +1 more. |
| October | Last sowing dates: Brussel Sprouts (Oct 1), Pole Beans (Oct 1), Basil (Oct 6), Cosmos (Oct 6), Cucumber (Oct 6), Zinnias (Oct 6), +12 more. |
| November | Start indoors: Chives (Nov 9), Lavender (Nov 9), Onion (Nov 9), Rosemary (Nov 9), Celery (Nov 23), Collards (Nov 23), +5 more. Last sowing dates: Beets (Nov 1), Dill (Nov 1), Swiss Chard (Nov 1), Calendula (Nov 6), Cilantro (Nov 6), Collards (Nov 10), +8 more. |
| December | Start indoors: Broccoli (Dec 7), Brussel Sprouts (Dec 7), Cabbage (Dec 7), Lettuce (Dec 7), Sage (Dec 7), Swiss Chard (Dec 7), +8 more. Direct sow from: Arugula (Dec 7), Beets (Dec 7), Dill (Dec 7), Peas (Dec 7), Radish (Dec 7), Spinach (Dec 7), +1 more. Plant: Strawberry (Dec 28). Last sowing dates: Radish (Dec 1). |
Frequently Asked Questions
What is the last frost date for Mill Valley, CA (ZIP 94941)?
The median last spring frost date for Mill Valley, CA (ZIP code 94941) is around February 1. 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 Mill Valley, CA?
The median first fall frost date for Mill Valley, CA is around January 2. 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 19 in the earliest one-in-ten years, so cover tomatoes and peppers from then.
How long is the growing season in Mill Valley, CA?
The frost-free growing season in Mill Valley is about 335 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 Mill Valley (335 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 Mill Valley, CA?
Mill Valley, 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 Mill Valley, CA?
Start tomatoes indoors Dec 28 and plant out Feb 15 in Mill Valley. The planner uses the local median last frost and this crop's indoor-start and transplant offsets.
How many plantings of lettuce fit in Mill Valley?
Two: plant Jan 4 and again by Nov 11; both mature before Jan 9.
When do I plant garlic in Mill Valley?
Jan 2 to Jan 23; it overwinters and is ready the following summer.
Can I get two tomato crops in Mill Valley?
Yes: plant out Feb 15 for a summer crop, and set out a second round of transplants by Sep 2 for a fall crop.
Which nearby ZIP has a longer season?
Greenbrae (ZIP 94904) has 343 frost-free days, 8 more than Mill Valley (ZIP 94941). See Greenbrae ZIP 94904 frost dates
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