Solano County, CA — Planting Guide
Solano County is in USDA Zone 9a. The average last spring frost is February 9 and the first fall frost is December 3, giving you a growing season of approximately 298 days.
At an elevation of 376 ft, Solano County receives approximately 40.4 in of rainfall annually. Summer highs average 95°F with winter lows around 56°F. The predominant soil type is Loam.
Based on 29 years of NOAA climate station data, the last frost date here varies by 67 days year to year — ranging from January 6 in warm years to March 13 in cold years. The growing season is trending shorter by about 3.54 days per decade. Solano County scores 52/100 (Moderate) on the Microclimate Index.
🌡️ Zone
9a (20°F to 25°F min)
❄️ Last Frost
February 9
🍂 First Frost
December 3
📅 Growing Season
298 days
⛰️ Elevation
376 ft
🌧️ Annual Rainfall
40.4 in
Monthly Watering Calendar
When you'll need to water your garden — based on average monthly rainfall vs. the ~1 inch/week most gardens need.
View detailed monthly data
| Month | Avg Rainfall | Rainy Days | Extra Water Needed | Watering Effort |
|---|---|---|---|---|
| Jan | 8.9 in | 9 days | — | None |
| Feb | 8.4 in | 9 days | — | Low |
| Mar | 6.6 in | 7 days | — | Low |
| Apr | 2.7 in | 5 days | 1.6 in | High |
| May | 1 in | 2 days | 3.3 in | Critical |
| Jun | 0.2 in | 1 days | 4.1 in | Critical |
| Jul | 0 in | 0 days | 4.3 in | Critical |
| Aug | 0 in | 0 days | 4.3 in | Critical |
| Sep | 0.4 in | 1 days | 3.9 in | Critical |
| Oct | 1.9 in | 3 days | 2.4 in | High |
| Nov | 3.3 in | 5 days | 1 in | Moderate |
| Dec | 7.1 in | 7 days | — | None |
Annual total: 40.5 in. Water needs vary by crop — tomatoes need ~1.2"/week while herbs like rosemary need only 0.3"/week. Check individual plant pages for crop-specific water budgets that factor in your county's rainfall and soil drainage.
Solano County Soil Profile
Soil Type
Loam
Soil pH
6.8-7.3
Drainage
Well Drained
Frost Risk Probability
Based on 29 years of NOAA weather station data from 3 stations
Beginners: Plant frost-sensitive crops (tomatoes, peppers, squash) after the "Safe" date on the left. Harvest or cover them before the "Protect by" date on the right. Hardy crops (lettuce, peas, kale) can go in the yellow transition zones.
How to read this table: "Conservative" means you're safe from frost 9 out of 10 years — best for beginners and frost-sensitive crops. "Average year" is the typical date. "Aggressive" means only 1 in 10 years is that warm — experienced gardeners with frost protection can try these dates.
| Planting Strategy | Last Spring Frost | First Fall Frost | Frost-Free Days |
|---|---|---|---|
| Conservative (safest) | Mar 13 | Dec 19 | 281 days |
| Cautious | Feb 27 | Dec 9 | 285 days |
| Average year | Feb 9 | Dec 3 | 297 days |
| Optimistic | Jan 25 | Nov 26 | 305 days |
| Aggressive (risky) | Jan 6 | Nov 12 | 310 days |
Not very — frost dates can vary by ±67 days year-to-year. Use the "Conservative" row in the table below, and keep row covers handy for surprise late frosts.
Yes — growing seasons are getting shorter here (about 3.5 days per decade). Use the "Conservative" dates and choose fast-maturing varieties.
Gardening Difficulty Score
Solano County presents some gardening challenges. Choose adapted varieties and plan around frost dates.
Local Gardening Help in Solano County
Free expert help is closer than you think. Your county's cooperative extension office connects you with trained gardeners, soil testing labs, and local programs — all specific to Solano County's climate and soil.
County Extension Office
Solano County University of California Cooperative Extension Extension Office
Phone: 530-750-1200
Visit Extension Office Website →
Extension offices are run by land-grant universities and funded by the USDA. Their advice is free, research-based, and tailored to your county's specific conditions.
Master Gardener Program
Free gardening help from trained volunteers
Master Gardeners are community volunteers who complete 40–60 hours of university horticultural training. They answer gardening questions, diagnose plant problems, and offer workshops — all free.
Many extension offices run a Master Gardener hotline where you can call or email with photos of plant problems for free diagnosis.
Soil Testing
Available through your extension office
Before amending your soil, get it tested. Your extension office offers soil testing (typically $10–$25) that tells you exact pH, nutrient levels, and amendment recommendations specific to what you want to grow.
Services Available in Solano County
Finding local nurseries & garden centers in Solano County
Why Buy Local
Local nurseries carry plants that are proven to grow in your area. Staff can give you advice specific to Solano County's soil and climate that big-box stores can't. Plants from local growers are typically hardier because they're already acclimated to your zone.
How to Find Them
Search for "nurseries near Solano County CA" or "garden center Solano County" on Google Maps. Also check with your extension office — they often maintain lists of reputable local nurseries and plant sales.
Community gardens & gardening groups
Community gardens are a great way to learn from experienced gardeners in your area, especially if you're limited on space. Search "community garden Solano County CA" or check your extension office and local parks department. Facebook groups like "Solano County Gardeners" or "California Gardening" are also excellent for local advice and plant swaps.
What to Plant After Your Harvest
After your first crops finish, use the remaining frost-free days to grow a second round.
Show 6 more succession options
Sunlight & Day Length
Monthly daylight hours and peak sun — critical for onion varieties, photoperiod-sensitive plants, and solar garden planning.
Longest Day
14.6 hours
Summer solstice daylight
Shortest Day
9.3 hours
Winter solstice daylight
Peak Sun Hours
12.7 hr/day peak (summer)
Peak sun hours (green dashed line below) account for cloud cover — this is the usable direct sunlight your garden actually receives. Most vegetables need 6+ peak sun hours.
Onion tip: Your long summer days (14+ hours) support long-day onion varieties like Walla Walla, Sweet Spanish, and Ailsa Craig.
View detailed monthly data
| Month | Daylight Hours | Peak Sun Hours | Day Length |
|---|---|---|---|
| January | 9.6 hr | 5.8 hr | Short day |
| February | 10.6 hr | 6.2 hr | Short day |
| March | 11.7 hr | 7.7 hr | Short day |
| April | 13 hr | 9.1 hr | Neutral |
| May | 14.1 hr | 11.6 hr | Long day |
| June | 14.6 hr | 12.7 hr | Long day |
| July | 14.4 hr | 12.7 hr | Long day |
| August | 13.5 hr | 12.7 hr | Neutral |
| September | 12.2 hr | 10.3 hr | Neutral |
| October | 11 hr | 8.6 hr | Short day |
| November | 9.9 hr | 6 hr | Short day |
| December | 9.3 hr | 5.3 hr | Short day |
Peak sun hours factor in typical cloud cover — use these for solar panel and shade-planning calculations.
Soil Temperature & Composting Calendar
Monthly soil temps tell you when to plant warm-season crops, and when your compost pile is actively working.
Plant Warm Crops When
Soil reaches 60°F+
Soil warm enough from Apr through Nov.
Best Month to Compost
Apr
Microbial activity peaks when soil is warm.
Active Composting
12 months
Nearly year-round composting.
View detailed monthly data
| Month | Soil 4" Deep | Soil 8" Deep | Compost Activity | Time to Finish |
|---|---|---|---|---|
| Jan | 53°F | 57°F | ♻️ Active | ~14 weeks |
| Feb | 53°F | 56°F | ♻️ Active | ~14 weeks |
| Mar | 60°F | 61°F | ♻️ Active | ~14 weeks |
| Apr | 65°F | 68°F | 🔥 Peak | ~8 weeks |
| May | 76°F | 75°F | 🔥 Peak | ~8 weeks |
| Jun | 85°F | 83°F | 🔥 Peak | ~8 weeks |
| Jul | 95°F | 88°F | 🔥 Peak | ~8 weeks |
| Aug | 95°F | 92°F | 🔥 Peak | ~8 weeks |
| Sep | 89°F | 88°F | 🔥 Peak | ~8 weeks |
| Oct | 81°F | 82°F | 🔥 Peak | ~8 weeks |
| Nov | 65°F | 71°F | 🔥 Peak | ~8 weeks |
| Dec | 57°F | 61°F | ♻️ Active | ~14 weeks |
Highlighted rows = soil 60°F+ (safe for warm-season transplants). Compost finishes fastest during peak activity months.
Pest & Disease Pressure in Solano County
Computed from local climate patterns — warmer, humid conditions increase pest generations and fungal disease risk.
Insect Pest Pressure
High — expect multiple pest generations. Preventative measures essential.
Disease Risk
High fungal/bacterial risk. Space plants for airflow, water at soil level.
Seasonal Risk
View 6 common pests in your area
| Pest | Risk Level | Peak Months |
|---|---|---|
| Aphids | High | Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov |
| Whiteflies | High | Apr, May, Jun, Jul, Aug, Sep, Oct, Nov |
| Spider mites | High | May, Jun, Jul, Aug, Sep, Oct |
| Fire ants | Moderate | Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov |
| Thrips | Moderate | Apr, May, Jun, Jul, Aug |
| Leaf miners | Moderate | Mar, Apr, May, Jun |
Organic pest management tips
- Install physical barriers: floating row covers, copper tape for slugs, mesh netting
- Apply Bt (Bacillus thuringiensis) for caterpillar control — safe for beneficial insects
- Use kaolin clay spray to deter a wide range of insects on fruiting crops
- Release beneficial insects: ladybugs for aphids, parasitic wasps for caterpillars
- Apply neem oil weekly during high-pressure months
- Mulch heavily (3-4 inches) to reduce soil-borne disease splash
Cover Crops for Solano County
Cover crops protect bare soil, fix nitrogen, suppress weeds, and improve soil structure — with county-specific planting dates.
Spring Cover Crops (4 options) — Build soil before the main growing season
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Buckwheat | Feb 18 | Oct 1 | — | Rapid growth, attracts pollinators, suppresses weeds |
| Cowpeas (southern peas) | Feb 20 | Sep 24 | ✓ Yes | Excellent nitrogen fixer for warm climates, edible |
| Sorghum-sudan grass | Feb 22 | Sep 24 | — | Massive biomass, breaks compaction, suppresses nematodes |
| White clover | Jan 12 | Oct 1 | ✓ Yes | Living mulch, fixes nitrogen, permanent ground cover |
Summer Cover Crops (1 options) — Fill gaps and suppress weeds between plantings
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Sunflowers | Feb 27 | Nov 19 | — | Deep roots break compaction, attract pollinators and beneficial insects |
Fall Cover Crops (4 options) — Plant after harvest to protect soil over winter
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Austrian winter peas | Sep 26 | Jan 19 | ✓ Yes | Fixes nitrogen, good for heavy clay soils |
| Crimson clover | Sep 30 | Jan 19 | ✓ Yes | Fixes nitrogen, attracts pollinators in spring |
| Daikon radish | Oct 21 | Jan 19 | — | Deep taproot breaks compaction, excellent for clay soils |
| Hairy vetch | Sep 26 | Jan 26 | ✓ Yes | Excellent nitrogen fixer, good for depleted soils |
Wind & Microclimate
Wind dries soil, stresses plants, and affects frost patterns. Understanding your exposure helps with garden placement.
Seasonal Wind Speed
Spring: 12 mph Summer: 10 mph
Fall: 8 mph Winter: 7 mph
Prevailing wind: W. Moderate wind — consider a temporary windbreak for young seedlings.
Windbreak Benefit
5.3/10
Moderately beneficial — a simple fence or trellis can protect delicate crops from wind stress.
Frost Pocket Risk
Moderate
Some terrain variation (548 ft range). Garden on slopes or higher ground if possible to avoid late-season frost pockets.
Rainwater Harvesting Potential
How much water you can collect, when to collect it, and what size system you need for your garden.
Annual Collection
20,185 gal
Per 1,000 sq ft of roof area (at 80% collection efficiency)
Recommended Setup
6 rain barrels (55 gal each)
For a typical 500 sq ft garden. Serious collectors: consider a 2,500 gal tank.
Legal Status
Unrestricted
Rainwater harvesting is fully legal in your state with no restrictions.
Best Collection Months
Jan, Feb, Mar, Dec
Highest rainfall months — your barrels will fill up quickly during these months.
Months to Draw From Storage
Jun, Jul, Aug, Sep
Dry months when you'll rely on stored water — size your storage for this gap.
Rainwater collection tips for your area
- Your county receives approximately 40.5 inches of rain per year
- A 1,000 sq ft roof can collect roughly 20,185 gallons annually
- Rainwater harvesting is fully legal in your state
- Stock up on stored water before your dry season (Jun, Jul, Aug)
- Use a first-flush diverter to keep roof debris out of your collection
Soil & Growing Conditions in Solano County
Soil Type
Loam
Soil pH 6.8–7.3 · Excessively Drained drainage
Native soil is well-suited to most vegetables and herbs with regular compost additions.
Watering Needs
Drought stress: 7.5/10
High drought stress. Consistent irrigation is essential — consider drip systems, heavy mulch, and drought-tolerant varieties.
Season Tips
298-day frost-free season
Your long season supports multiple successions and heat-demanding crops like melons, sweet potatoes, and peppers. Plant warm-season crops as soon as soil warms.
Free Garden Planner
Plan your entire garden season — organize planting dates, track what you're growing, and know exactly when to start seeds, transplant, and harvest.
Recommended for Your Garden
Reduce heat stress and sun scorch in hot climates with UV-stabilized shade cloth.
Test your soil pH, nitrogen, phosphorus, and potassium levels before planting.
Get instant, accurate soil pH readings to fine-tune your amendments.
🥬 Vegetables to Grow in Solano County
115 vegetables that grow well in Zone 9a with planting dates for Solano County.
Show all 115 vegetables with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Acorn Squash | Jan 12 | Feb 9 | Feb 16 | May 11 – Jun 15 | 80–100 |
| Amaranth | Dec 29 | Feb 9 | Feb 16 | May 18 – Jul 6 | 90–120 |
| Artichoke | — | — | Feb 23 | Jun 29 – Sep 7 | 120–180 |
| Arugula | Jan 12 | Jan 19 | Feb 9 | Mar 16 – May 18 | 30–50 |
| Asparagus | — | — | Feb 23 | — | 730–1095 |
| Beets | — | Jan 19 | — | Mar 16 – Apr 13 | 50–70 |
| Belgian Endive | Jan 12 | Jan 19 | Feb 9 | Jun 1 – Jul 27 | 110–150 |
| Bitter Melon | Dec 29 | Feb 9 | Feb 16 | Apr 20 – Jun 1 | 60–90 |
| Black Beans | — | Feb 16 | — | May 18 – Jul 6 | 90–120 |
| Bok Choy | Jan 12 | Jan 19 | Feb 9 | Mar 23 – Apr 27 | 40–60 |
| Broccoli | Jan 12 | Jan 19 | Feb 9 | Apr 13 – May 25 | 60–90 |
| Broccoli Rabe | Jan 12 | Jan 19 | Feb 9 | Mar 23 – Apr 27 | 40–60 |
| Brussels Sprouts | Jan 12 | Jan 19 | Feb 9 | May 11 – Jul 6 | 90–130 |
| Butternut Squash | Jan 12 | Feb 9 | Feb 16 | May 18 – Jun 22 | 85–110 |
| Cabbage | Jan 12 | Jan 19 | Feb 9 | Apr 13 – Jun 8 | 60–100 |
| Calabash | Dec 29 | Feb 9 | Feb 16 | May 11 – Jul 6 | 80–120 |
| Cardoon | — | — | Feb 23 | Jun 29 – Aug 10 | 120–150 |
| Carrots | — | Jan 19 | — | Mar 23 – Apr 27 | 60–80 |
| Cauliflower | Jan 12 | Jan 19 | Feb 9 | Apr 6 – Jun 8 | 55–100 |
| Celeriac | Jan 12 | Jan 19 | Feb 9 | May 25 – Jun 29 | 100–120 |
| Celery | Jan 12 | Jan 19 | Feb 9 | May 4 – Jun 29 | 80–120 |
| Celtuce | Jan 12 | Jan 19 | Feb 9 | Apr 13 – May 25 | 60–90 |
| Chard | Jan 12 | Jan 19 | Feb 9 | Apr 6 – May 25 | 50–60 |
| Chayote | Dec 29 | Feb 9 | Feb 16 | Jun 22 – Aug 31 | 120–180 |
| Chickpeas | Jan 12 | Jan 19 | Feb 9 | May 4 – Jun 15 | 80–110 |
| Chicory | Jan 12 | Jan 19 | Feb 9 | Apr 13 – May 25 | 60–85 |
| Chinese Cabbage | Jan 12 | Jan 19 | Feb 9 | Apr 6 – May 4 | 50–70 |
| Christmas Lima Beans | Dec 29 | Feb 9 | Feb 16 | May 11 – Jun 15 | 80–100 |
| Collard Greens | Jan 12 | Jan 19 | Feb 9 | Apr 6 – Jun 8 | 55–75 |
| Corn | — | Feb 16 | — | Apr 20 – Jun 15 | 60–100 |
| Cowpeas | — | Feb 16 | — | Apr 20 – Jun 1 | 60–90 |
| Cress | Jan 12 | Jan 19 | Feb 9 | Feb 23 – Mar 16 | 14–21 |
| Crookneck Squash | Jan 12 | Feb 9 | Feb 16 | Apr 6 – May 4 | 45–60 |
| Crosne | — | Jan 19 | — | Jun 22 – Aug 24 | 150–200 |
| Cucumber | Jan 12 | Feb 9 | Feb 16 | Apr 13 – Jun 8 | 50–70 |
| Daikon | — | Jan 19 | — | Mar 16 – Apr 13 | 50–70 |
| Delicata Squash | Jan 12 | Feb 9 | Feb 16 | May 11 – Jun 15 | 80–100 |
| Edamame | — | Feb 16 | — | May 4 – Jun 15 | 75–100 |
| Eggplant | Dec 29 | Feb 9 | Feb 16 | Apr 27 – Jun 29 | 65–85 |
| Endive | Jan 12 | Jan 19 | Feb 9 | Mar 30 – May 4 | 45–65 |
| Escarole | Jan 12 | Jan 19 | Feb 9 | Apr 6 – May 4 | 50–70 |
| Fava Beans | Jan 12 | Jan 19 | Feb 9 | Apr 27 – Jun 8 | 75–100 |
| Fennel | Dec 29 | Feb 9 | Feb 16 | Apr 20 – Jun 1 | 60–90 |
| Garlic | — | — | — | — | 90–240 |
| Ginger | Dec 29 | Feb 9 | Feb 16 | Oct 19 – Dec 14 | 240–300 |
| Green Beans | — | Feb 16 | — | Apr 13 – Jun 8 | 50–65 |
| Horseradish | — | — | Feb 23 | Jun 29 – Sep 7 | 120–180 |
| Hot Peppers | Dec 29 | Feb 9 | Feb 16 | Apr 27 – Aug 3 | 70–120 |
| Hubbard Squash | Jan 12 | Feb 9 | Feb 16 | Jun 1 – Jul 6 | 100–120 |
| Jicama | Dec 29 | Feb 9 | Feb 16 | Jun 22 – Aug 31 | 120–180 |
| Kabocha | Jan 12 | Feb 9 | Feb 16 | May 18 – Jun 15 | 85–100 |
| Kai Lan | Jan 12 | Jan 19 | Feb 9 | Mar 30 – Apr 27 | 45–60 |
| Kale | Jan 12 | Jan 19 | Feb 9 | Apr 6 – Jun 1 | 50–70 |
| Kidney Beans | — | Feb 16 | — | May 18 – Jun 22 | 85–110 |
| Kohlrabi | Jan 12 | Jan 19 | Feb 9 | Mar 30 – May 4 | 45–65 |
| Komatsuna | Jan 12 | Jan 19 | Feb 9 | Mar 16 – Apr 20 | 35–50 |
| Leeks | Jan 12 | Jan 19 | Feb 9 | May 11 – Jul 27 | 90–150 |
| Lentils | Jan 12 | Jan 19 | Feb 9 | May 4 – Jun 15 | 80–110 |
| Lettuce | Jan 12 | Jan 19 | Feb 9 | Mar 16 – May 25 | 30–60 |
| Lima Beans | — | Feb 16 | — | Apr 20 – Jun 1 | 60–90 |
| Loofah | Dec 29 | Feb 9 | Feb 16 | Jun 1 – Aug 3 | 100–150 |
| Luffa | Dec 29 | Feb 9 | Feb 16 | May 18 – Aug 3 | 90–150 |
| Mache | Jan 12 | Jan 19 | Feb 9 | Mar 23 – Apr 27 | 40–60 |
| Malabar Spinach | Dec 29 | Feb 9 | Feb 16 | Apr 13 – May 11 | 55–70 |
| Melon | Jan 12 | Feb 9 | Feb 16 | Apr 27 – Jun 15 | 70–100 |
| Microgreens | Jan 12 | Jan 19 | Feb 9 | Feb 16 – Mar 16 | 7–21 |
| Mitsuba | Jan 12 | Jan 19 | Feb 2 | Mar 30 – May 25 | 50–70 |
| Mizuna | Jan 12 | Jan 19 | Feb 9 | Mar 16 – Apr 13 | 30–45 |
| Mustard Greens | Jan 12 | Jan 19 | Feb 9 | Mar 16 – May 18 | 30–50 |
| Napa Cabbage | Jan 12 | Jan 19 | Feb 9 | Apr 6 – May 11 | 55–75 |
| New Zealand Spinach | Dec 29 | Feb 9 | Feb 16 | Apr 13 – May 11 | 55–70 |
| Okra | Dec 29 | Feb 9 | Feb 16 | Apr 13 – Jun 8 | 50–65 |
| Onion | Jan 12 | Jan 19 | Feb 9 | May 11 – Jun 29 | 90–120 |
| Pac Choi | Jan 12 | Jan 19 | Feb 9 | Mar 23 – Apr 20 | 40–55 |
| Parsnip | — | Jan 19 | — | May 4 – Jun 15 | 100–130 |
| Patty Pan Squash | Jan 12 | Feb 9 | Feb 16 | Apr 6 – May 4 | 45–60 |
| Peas | Jan 12 | Jan 19 | Feb 9 | Apr 6 – Jun 1 | 55–70 |
| Peppers | Dec 29 | Feb 9 | Feb 16 | Apr 20 – Jun 29 | 60–90 |
| Pole Beans | Dec 29 | Feb 9 | Feb 16 | Apr 13 – Jun 8 | 55–70 |
| Potatoes | Dec 29 | Feb 9 | Feb 16 | Apr 27 – Jul 6 | 70–120 |
| Pumpkin | Jan 12 | Feb 9 | Feb 16 | May 18 – Jul 6 | 85–120 |
| Purslane | Jan 12 | Jan 19 | Feb 9 | Mar 23 – Apr 27 | 40–60 |
| Radicchio | Jan 12 | Jan 19 | Feb 9 | Apr 13 – May 18 | 60–80 |
| Radish | — | Jan 19 | — | Feb 16 – Mar 9 | 22–35 |
| Romanesco | Jan 12 | Jan 19 | Feb 9 | Apr 27 – Jun 8 | 75–100 |
| Rutabaga | — | Jan 19 | — | Apr 13 – May 18 | 80–100 |
| Salsify | — | Jan 19 | — | May 4 – Jun 15 | 100–130 |
| Savoy Cabbage | Jan 12 | Jan 19 | Feb 9 | Apr 20 – Jun 15 | 70–110 |
| Scallions | Jan 12 | Jan 19 | Feb 9 | Apr 6 – May 4 | 50–70 |
| Scarlet Runner Beans | Dec 29 | Feb 9 | Feb 16 | Apr 20 – May 25 | 60–80 |
| Shallot | Jan 12 | Jan 19 | Feb 9 | May 11 – Jun 29 | 90–120 |
| Shiso | Dec 29 | Feb 16 | Feb 16 | Apr 13 – Jun 8 | 50–70 |
| Snap Peas | Dec 29 | Feb 9 | Feb 16 | Apr 13 – Jun 8 | 55–70 |
| Snow Peas | Jan 12 | Jan 19 | Feb 9 | Apr 6 – Jun 1 | 50–65 |
| Soybeans | — | Feb 16 | — | May 11 – Jul 6 | 80–120 |
| Spaghetti Squash | Jan 12 | Feb 9 | Feb 16 | May 18 – Jun 15 | 85–100 |
| Spinach | Jan 12 | Jan 19 | Feb 9 | Mar 16 – May 18 | 35–50 |
| Squash (Summer) | Jan 12 | Feb 9 | Feb 16 | Apr 6 – Jun 8 | 45–65 |
| Squash (Winter) | Jan 12 | Feb 9 | Feb 16 | May 11 – Jul 6 | 80–120 |
| Sunchoke | — | — | Feb 23 | Jun 15 – Aug 10 | 110–150 |
| Sunflower | Dec 29 | Feb 9 | Feb 16 | Apr 27 – Jun 15 | 70–100 |
| Sweet Corn | — | Feb 16 | — | Apr 20 – Jun 1 | 60–90 |
| Sweet Potatoes | Dec 29 | Feb 9 | Feb 16 | May 18 – Jul 6 | 90–120 |
| Tatsoi | Jan 12 | Jan 19 | Feb 9 | Mar 16 – Apr 20 | 35–50 |
| Tomatillo | Dec 29 | Feb 9 | Feb 16 | Apr 20 – Jun 29 | 60–85 |
| Tomatoes | Dec 29 | Feb 9 | Feb 16 | Apr 20 – Jun 29 | 60–85 |
| Turmeric | Dec 29 | Feb 9 | Feb 16 | Oct 19 – Dec 14 | 240–300 |
| Turnip | — | Jan 19 | — | Mar 2 – Apr 6 | 40–60 |
| Watercress | Jan 12 | Jan 19 | Feb 9 | Mar 23 – Apr 27 | 40–60 |
| Watermelon | Jan 12 | Feb 9 | Feb 16 | Apr 27 – Jun 15 | 70–100 |
| Wax Beans | — | Feb 16 | — | Apr 13 – Jun 8 | 50–65 |
| Winter Melon | Dec 29 | Feb 9 | Feb 16 | May 18 – Jul 6 | 90–120 |
| Yam | Dec 29 | Feb 9 | Feb 16 | Aug 17 – Dec 14 | 180–330 |
| Yard Long Beans | Dec 29 | Feb 9 | Feb 16 | Apr 13 – May 25 | 55–80 |
| Zucchini | Jan 12 | Feb 9 | Feb 16 | Apr 6 – Jun 1 | 45–60 |
🍓 Fruits to Grow in Solano County
24 fruits that grow well in Zone 9a with planting dates for Solano County.
Show all 24 fruits with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Alpine Strawberries | — | — | Feb 23 | May 25 – Sep 7 | 90–180 |
| Blackberries | — | — | Feb 23 | — | 365–730 |
| Boysenberries | — | — | Feb 23 | — | 365–730 |
| Cantaloupe | — | — | Feb 23 | May 4 – Jun 8 | 70–90 |
| Che Fruit | — | — | Feb 23 | — | 1095–1825 |
| Dragon Fruit | — | — | Feb 23 | — | 365–730 |
| Elderberries | — | — | Feb 23 | — | 730–1095 |
| Figs | — | — | Feb 23 | — | 730–1825 |
| Goji Berries | — | — | Feb 23 | — | 730–1095 |
| Grapes | — | — | Feb 23 | — | 730–1095 |
| Ground Cherry | — | — | Feb 23 | May 4 – Jun 29 | 65–80 |
| Guava | — | — | Feb 23 | — | 365–730 |
| Honeydew | — | — | Feb 23 | May 18 – Jun 29 | 80–110 |
| Kiwi | — | — | Feb 23 | — | 1095–1825 |
| Loquat | — | — | Feb 23 | — | 730–1825 |
| Mulberries | — | — | Feb 23 | — | 730–1825 |
| Passion Fruit | — | — | Feb 23 | — | 365–545 |
| Pawpaw | — | — | Feb 23 | — | 1095–2555 |
| Persimmon | — | — | Feb 23 | — | 1095–2555 |
| Pomegranate | — | — | Feb 23 | — | 730–1095 |
| Quince | — | — | Feb 23 | — | 1095–1825 |
| Raspberries | — | — | Feb 23 | — | 365–730 |
| Serviceberries | — | — | Feb 23 | — | 730–1095 |
| Strawberries | — | — | Feb 23 | May 25 – Dec 21 | 90–365 |
🌿 Herbs to Grow in Solano County
40 herbs that grow well in Zone 9a with planting dates for Solano County.
Show all 40 herbs with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Anise | Jan 12 | Jan 19 | Feb 2 | May 4 – Jul 20 | 90–120 |
| Basil | Dec 29 | Feb 16 | Feb 16 | Apr 13 – Jun 15 | 50–75 |
| Bee Balm | — | — | Feb 16 | May 18 – Aug 3 | 90–120 |
| Borage | Jan 12 | Jan 19 | Feb 2 | Mar 30 – May 18 | 50–60 |
| Caraway | Jan 12 | Jan 19 | Feb 2 | — | 365–450 |
| Catnip | — | — | Feb 16 | Apr 20 – Jun 22 | 60–80 |
| Chamomile | Jan 12 | Jan 19 | Feb 2 | Apr 6 – Jun 15 | 60–90 |
| Chervil | Jan 12 | Jan 19 | Feb 2 | Mar 16 – May 18 | 40–60 |
| Chives | — | — | Feb 16 | Apr 20 – Jun 29 | 60–90 |
| Cilantro | Jan 12 | Jan 19 | Feb 2 | Mar 16 – May 18 | 40–60 |
| Comfrey | — | — | Feb 16 | Apr 20 – Jun 29 | 60–90 |
| Cumin | Jan 12 | Jan 19 | Feb 2 | May 18 – Jul 20 | 100–120 |
| Dill | Jan 12 | Jan 19 | Feb 2 | Mar 16 – May 18 | 40–60 |
| Echinacea | — | — | Feb 16 | Jun 22 – Sep 28 | 120–180 |
| Epazote | Dec 29 | Feb 16 | Feb 16 | Apr 6 – Jun 1 | 45–60 |
| Fennel (herb) | Jan 12 | Jan 19 | Feb 2 | Apr 6 – Jun 15 | 60–90 |
| Feverfew | — | — | Feb 16 | May 18 – Aug 3 | 90–120 |
| Garlic Chives | — | — | Feb 16 | Apr 20 – Jun 29 | 60–90 |
| Horehound | — | — | Feb 16 | May 4 – Jun 29 | 75–90 |
| Hyssop | — | — | Feb 16 | Apr 27 – Jun 29 | 70–90 |
| Lavender | — | — | Feb 16 | May 18 – Oct 19 | 90–200 |
| Lemon Balm | — | — | Feb 16 | Apr 20 – Jun 8 | 60–70 |
| Lemon Thyme | — | — | Feb 16 | Apr 27 – Jun 29 | 70–90 |
| Lemon Verbena | Dec 29 | Feb 16 | Feb 16 | Apr 20 – Jun 29 | 60–90 |
| Lemongrass | Dec 29 | Feb 16 | Feb 16 | May 4 – Aug 3 | 75–120 |
| Marjoram | — | — | Feb 16 | Apr 20 – Jun 29 | 60–90 |
| Mint | — | — | Feb 16 | Apr 20 – Jun 29 | 60–90 |
| Oregano | — | — | Feb 16 | Apr 20 – Jun 29 | 60–90 |
| Parsley | Jan 12 | Jan 19 | Feb 2 | Apr 6 – Jun 8 | 60–80 |
| Rosemary | — | — | Feb 16 | May 11 – Sep 28 | 80–180 |
| Rue | — | — | Feb 16 | Apr 27 – Jun 29 | 70–90 |
| Sage | — | — | Feb 16 | May 4 – Jun 29 | 75–90 |
| Savory | — | — | Feb 16 | Apr 13 – Jun 8 | 50–70 |
| Sorrel | Jan 12 | Jan 19 | Feb 2 | Mar 16 – May 18 | 40–60 |
| Stevia | Dec 29 | Feb 16 | Feb 16 | Apr 20 – Jun 29 | 60–90 |
| Tarragon | — | — | Feb 16 | Apr 20 – Jun 29 | 60–90 |
| Thai Basil | Dec 29 | Feb 16 | Feb 16 | Apr 13 – Jun 15 | 50–75 |
| Thyme | — | — | Feb 16 | Apr 27 – Jun 29 | 70–90 |
| Valerian | — | — | Feb 16 | Jun 22 – Sep 28 | 120–180 |
| Yarrow | — | — | Feb 16 | May 18 – Aug 3 | 90–120 |
Monthly Planting Guide for Solano County
Gardening Guides & Resources
Helpful guides from The Ultimate Homestead to improve your garden in Solano County.
Frequently Asked Questions
What planting zone is Solano County, CA?
Solano County is in USDA Hardiness Zone 9a. This zone classification determines which perennial plants survive winter and sets the baseline for frost timing across the county.
When is the last frost in Solano County, CA?
Based on 29 years of NOAA weather station data, the median last spring frost in Solano County falls around February 9. In 8 out of 10 years, last frost lands between January 6 and March 13 — a 67-day window of variability. Use March 13 as your conservative safe-to-plant date for frost-sensitive crops.
When is the first fall frost in Solano County, CA?
The median first fall frost in Solano County arrives around December 3. In cold years it can arrive as early as November 12; in mild years as late as December 19. Harvest or protect frost-sensitive crops — tomatoes, peppers, basil, squash — before this date.
How long is the growing season in Solano County?
Solano County has a frost-free growing season of approximately 298 days. This long season supports multiple succession plantings and warm-season crops that need extended heat, like sweet potatoes and melons. Climate records show the growing season is trending shorter by about 3.54 days per decade.
What is the soil like in Solano County for gardening?
Solano County has predominantly Loam soil with a pH range of 6.8–7.3 and Excessively Drained drainage. Most vegetables and herbs grow well with standard composting and seasonal soil amendment.
What is grown commercially in Solano County?
Solano County has commercial agriculture that includes Almonds, Grapes, Dairy, Tomatoes, Walnuts. These crops reflect the local climate and soil conditions — what succeeds commercially often translates well to home gardens in the same area.
Is Solano County a good location for home gardening?
Solano County scores 52/100 (Moderate) on our Microclimate Index, which combines frost reliability, drought pressure, soil challenge, elevation risk, and long-term climate trend. Conditions here are moderate — most common crops grow well with standard timing and care.
Plan Your Garden with Confidence
Get our free Garden Planner — designed to help Solano County gardeners in Zone 9a organize planting dates, track what's growing, and never miss a planting window.
Get Your Free Garden Planner →Free download. Plan your entire garden season in minutes.
