Frost Dates for San Ramon, CA 94583
San Ramon has 2 ZIP codes. The San Ramon, CA frost page lists all of them with their dates.
Last spring frost March 13 · First fall frost November 24 · 256 frost-free days · USDA Zone 9b
ZIP 94583 has about 39,600 people, one of 2 ZIP codes in San Ramon.
Very long season: 256 frost-free days. Spring frost risk spans January 18–April 7 (79 days). Fall frost risk spans November 12–January 14 (63 days).
Frost probability for 94583
| Frost | 10% | 50% | 90% |
|---|---|---|---|
| Spring (last frost) | April 7 | March 13 | January 18 |
| Fall (first frost) | November 12 | November 24 | January 14 |
Dates come from NOAA 1971–2000 freeze probabilities at MT DIABLO JUNCTION (13.0 km away); the 50% date is the median year.
Which crops fit a 256-day season in San Ramon
In San Ramon (256 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 6 | Mar 27–Apr 3 | 214 | fits: 80 days to maturity, 214 available after Mar 27. | Jul 25 |
| Pepper | Jan 30 | Mar 27–Apr 3 | 214 | fits: 75 days to maturity, 214 available after Mar 27. | Jul 30 |
| Lettuce | Jan 16 | Feb 13–Feb 20 | 291 | two-plantings: Plant Feb 13 and again by Oct 3; both mature before Dec 1. | Oct 3 |
| Carrots | — | Feb 20–Feb 27 | 298 | fits: 70 days to maturity, 298 available after Feb 20. | Sep 22 |
| Cucumber | Feb 20 | Mar 27–Apr 3 | 228 | two-plantings: Plant Mar 27 and again by Aug 28; both mature before Nov 10. | Aug 28 |
| Beans | — | Mar 20–Apr 3 | 242 | two-plantings: Plant Mar 20 and again by Sep 4; both mature before Nov 17. | Sep 4 |
| Peas | — | Jan 16–Mar 27 | 319 | fits: 65 days to maturity, 319 available after Jan 16. | Sep 13 |
| Zucchini | Feb 27 | Mar 27–Apr 3 | 228 | two-plantings: Plant Mar 27 and again by Sep 2; both mature before Nov 10. | Sep 2 |
| Onion | Dec 19 | Feb 13–Feb 27 | 291 | fits: 100 days to maturity, 291 available after Feb 13. | — |
| Spinach | — | Jan 16–Mar 6 | 333 | two-plantings: Plant Jan 16 and again by Oct 22; both mature before Dec 15. | Oct 22 |
| Kale | Jan 2 | Feb 13–Feb 27 | 305 | two-plantings: Plant Feb 13 and again by Oct 7; both mature before Dec 15. | Oct 7 |
| Broccoli | Jan 16 | Feb 13–Feb 27 | 291 | fits: 80 days to maturity, 291 available after Feb 13. | Aug 29 |
| Cabbage | Jan 16 | Feb 13–Feb 27 | 305 | fits: 70 days to maturity, 305 available after Feb 13. | Sep 22 |
| Radish | — | Jan 16–Apr 10 | 319 | two-plantings: Plant Jan 16 and again by Oct 23; both mature before Dec 1. | Oct 23 |
| Beets | — | Jan 16–Apr 10 | 319 | two-plantings: Plant Jan 16 and again by Sep 23; both mature before Dec 1. | Sep 23 |
| Potatoes | — | Feb 27–Mar 6 | 277 | fits: 90 days to maturity, 277 available after Feb 27. | — |
| Garlic | — | Nov 24 | 361 | overwinter: Plant Nov 24 to Dec 15; harvest the following summer. | Dec 15 |
| Strawberry | — | Feb 6–Apr 3 | 312 | perennial: A perennial: plant Feb 6; it fruits from the following year and keeps producing for several years. | — |
| Corn | Feb 13 | Mar 20–Mar 27 | 228 | fits: 75 days to maturity, 228 available after Mar 20. | Aug 6 |
| Pumpkin | Feb 27 | Mar 27–Mar 27 | 221 | fits: 100 days to maturity, 221 available after Mar 27. | Jul 12 |
| Cauliflower | Jan 30 | Mar 6–Mar 20 | 270 | fits: 75 days to maturity, 270 available after Mar 6. | Sep 3 |
| Swiss Chard | Jan 16 | Feb 27–Feb 27 | 277 | two-plantings: Plant Feb 27 and again by Sep 23; both mature before Dec 1. | Sep 23 |
| Arugula | — | Jan 16–Apr 10 | 333 | two-plantings: Plant Jan 16 and again by Oct 22; both mature before Dec 15. | Oct 22 |
| Brussel Sprouts | Jan 16 | Feb 13–Feb 27 | 305 | fits: 100 days to maturity, 305 available after Feb 13. | Aug 23 |
| Butternut Squash | Feb 27 | Mar 27–Apr 3 | 221 | fits: 100 days to maturity, 221 available after Mar 27. | Jul 12 |
| Eggplant | Jan 23 | Mar 27–Apr 3 | 214 | fits: 70 days to maturity, 214 available after Mar 27. | Aug 4 |
| Okra | Feb 13 | Mar 20–Mar 27 | 235 | two-plantings: Plant Mar 20 and again by Sep 2; both mature before Nov 10. | Sep 2 |
| Basil | Feb 6 | Apr 3–Apr 3 | 221 | two-plantings: Plant Apr 3 and again by Aug 28; both mature before Nov 10. | Aug 28 |
| Cilantro | — | Feb 13–Mar 6 | 291 | two-plantings: Plant Feb 13 and again by Sep 28; both mature before Dec 1. | Sep 28 |
| Parsley | Jan 2 | Mar 20–Mar 27 | 256 | fits: 70 days to maturity, 256 available after Mar 20. | Sep 8 |
| Celery | Jan 2 | Mar 20–Apr 3 | 256 | fits: 120 days to maturity, 256 available after Mar 20. | Jul 20 |
| Scallions | Jan 2 | Feb 13–Feb 27 | 305 | two-plantings: Plant Feb 13 and again by Oct 2; both mature before Dec 15. | Oct 2 |
| Turnip | — | Feb 13–Feb 27 | 305 | two-plantings: Plant Feb 13 and again by Oct 12; both mature before Dec 15. | Oct 12 |
| Kohlrabi | — | Jan 30–Feb 13 | 319 | two-plantings: Plant Jan 30 and again by Oct 7; both mature before Dec 15. | Oct 7 |
| Bok Choy | Feb 13 | Mar 6–Mar 13 | 270 | two-plantings: Plant Mar 6 and again by Oct 3; both mature before Dec 1. | Oct 3 |
| Collards | Jan 2 | Feb 13–Feb 27 | 305 | two-plantings: Plant Feb 13 and again by Oct 2; both mature before Dec 15. | Oct 2 |
| Cantaloupe | Feb 27 | Mar 27–Apr 3 | 214 | fits: 85 days to maturity, 214 available after Mar 27. | Jul 20 |
| Chives | Dec 19 | Mar 20–Mar 27 | 270 | fits: 90 days to maturity, 270 available after Mar 20. | — |
| Dill | — | Jan 16–Apr 10 | 319 | two-plantings: Plant Jan 16 and again by Sep 23; both mature before Dec 1. | Sep 23 |
| Oregano | Jan 2 | Mar 20–Mar 27 | 270 | fits: 80 days to maturity, 270 available after Mar 20. | — |
| Rosemary | Dec 19 | Mar 20–Mar 27 | 256 | fits: 80 days to maturity, 256 available after Mar 20. | — |
| Sage | Jan 16 | Mar 20–Mar 27 | 270 | fits: 75 days to maturity, 270 available after Mar 20. | — |
| Thyme | Jan 2 | Mar 20–Mar 27 | 270 | fits: 90 days to maturity, 270 available after Mar 20. | — |
| Calendula | Jan 30 | Feb 27–Mar 13 | 277 | two-plantings: Plant Feb 27 and again by Sep 28; both mature before Dec 1. | Sep 28 |
| Cosmos | Feb 13 | Mar 13–Mar 27 | 242 | two-plantings: Plant Mar 13 and again by Aug 28; both mature before Nov 10. | Aug 28 |
| Lavender | Dec 19 | Mar 13–Mar 27 | 277 | fits: 90 days to maturity, 277 available after Mar 13. | — |
| Marigolds | Jan 30 | Mar 13–Mar 20 | 242 | two-plantings: Plant Mar 13 and again by Sep 7; both mature before Nov 10. | Sep 7 |
| Melons | Feb 27 | Mar 27–Apr 3 | 214 | fits: 85 days to maturity, 214 available after Mar 27. | Jul 20 |
| Mint | — | Mar 13–Mar 27 | 277 | fits: 90 days to maturity, 277 available after Mar 13. | — |
| Nasturtiums | Feb 13 | Mar 13–Mar 20 | 242 | two-plantings: Plant Mar 13 and again by Sep 2; both mature before Nov 10. | Sep 2 |
| Pole Beans | — | Mar 20–Apr 3 | 235 | fits: 65 days to maturity, 235 available after Mar 20. | Aug 23 |
| Spaghetti Squash | Feb 27 | Mar 27–Apr 3 | 221 | fits: 90 days to maturity, 221 available after Mar 27. | Jul 22 |
| Sunflowers | — | Mar 13–Mar 27 | 242 | fits: 70 days to maturity, 242 available after Mar 13. | Aug 18 |
| Tomatillos | Jan 16 | Mar 20–Mar 27 | 221 | fits: 75 days to maturity, 221 available after Mar 20. | Jul 30 |
| Watermelon | Feb 27 | Mar 20–Mar 27 | 221 | fits: 80 days to maturity, 221 available after Mar 20. | Jul 25 |
| Yellow Squash | Feb 27 | Mar 27–Apr 3 | 228 | two-plantings: Plant Mar 27 and again by Sep 2; both mature before Nov 10. | Sep 2 |
| Zinnias | Feb 13 | Mar 13–Mar 27 | 242 | two-plantings: Plant Mar 13 and again by Aug 28; both mature before Nov 10. | Aug 28 |
Month by month in San Ramon
| Month | What to do |
|---|---|
| January | Start indoors: Celery (Jan 2), Collards (Jan 2), Kale (Jan 2), Oregano (Jan 2), Parsley (Jan 2), Scallions (Jan 2), +13 more. Direct sow from: Arugula (Jan 16), Beets (Jan 16), Dill (Jan 16), Peas (Jan 16), Radish (Jan 16), Spinach (Jan 16), +1 more. |
| February | Start indoors: Basil (Feb 6), Tomato (Feb 6), Bok Choy (Feb 13), Corn (Feb 13), Cosmos (Feb 13), Nasturtiums (Feb 13), +11 more. Direct sow from: Cilantro (Feb 13), Turnip (Feb 13), Carrots (Feb 20), Potatoes (Feb 27). Transplant from: Broccoli (Feb 13), Brussel Sprouts (Feb 13), Cabbage (Feb 13), Collards (Feb 13), Kale (Feb 13), Lettuce (Feb 13), +4 more. Plant: Strawberry (Feb 6). |
| March | Direct sow from: Sunflowers (Mar 13), Beans (Mar 20), Pole Beans (Mar 20). Transplant from: Bok Choy (Mar 6), Cauliflower (Mar 6), Cosmos (Mar 13), Lavender (Mar 13), Marigolds (Mar 13), Mint (Mar 13), +24 more. Last frost around March 13. |
| April | Transplant from: Basil (Apr 3). |
| 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 12), Pumpkin (Jul 12), Cantaloupe (Jul 20), Celery (Jul 20), Melons (Jul 20), Spaghetti Squash (Jul 22), +4 more. |
| August | Last sowing dates: Eggplant (Aug 4), Corn (Aug 6), Sunflowers (Aug 18), Brussel Sprouts (Aug 23), Pole Beans (Aug 23), Basil (Aug 28), +4 more. |
| September | Last sowing dates: Nasturtiums (Sep 2), Okra (Sep 2), Yellow Squash (Sep 2), Zucchini (Sep 2), Cauliflower (Sep 3), Beans (Sep 4), +10 more. |
| October | Last sowing dates: Collards (Oct 2), Scallions (Oct 2), Bok Choy (Oct 3), Lettuce (Oct 3), Kale (Oct 7), Kohlrabi (Oct 7), +4 more. |
| November | Direct sow from: Garlic (Nov 24). First frost around November 24. |
| December | Start indoors: Chives (Dec 19), Lavender (Dec 19), Onion (Dec 19), Rosemary (Dec 19). Last sowing dates: Garlic (Dec 15). |
Frequently Asked Questions
What is the last frost date for San Ramon, CA (ZIP 94583)?
The median last spring frost date for San Ramon, CA (ZIP code 94583) is around March 13. 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 18; one in ten it runs past April 7.
What is the first fall frost date in San Ramon, CA?
The median first fall frost date for San Ramon, CA is around November 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 12 in the earliest one-in-ten years, so cover tomatoes and peppers from then.
How long is the growing season in San Ramon, CA?
The frost-free growing season in San Ramon is about 256 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 San Ramon (256 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 San Ramon, CA?
San Ramon, 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 San Ramon, CA?
Start tomatoes indoors Feb 6 and plant out Mar 27 in San Ramon. The planner uses the local median last frost and this crop's indoor-start and transplant offsets.
How many plantings of lettuce fit in San Ramon?
Two: plant Feb 13 and again by Oct 3; both mature before Dec 1.
When do I plant garlic in San Ramon?
Nov 24 to Dec 15; it overwinters and is ready the following summer.
Can I get two tomato crops in San Ramon?
Yes: plant out Mar 27 for a summer crop, and set out a second round of transplants by Jul 25 for a fall crop.
Which nearby ZIP has a longer season?
Danville (ZIP 94526) has 289 frost-free days, 33 more than San Ramon (ZIP 94583). See Danville ZIP 94526 frost dates
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