San Joaquin County, CA — Planting Guide
San Joaquin County is in USDA Zone 9a. The average last spring frost is February 4 and the first fall frost is December 6, giving you a growing season of approximately 306 days.
At an elevation of 220 ft, San Joaquin County receives approximately 15 in of rainfall annually. Summer highs average 93°F with winter lows around 47°F. The predominant soil type is Loam.
Based on 29 years of NOAA climate station data, the last frost date here varies by 61 days year to year — ranging from January 4 in warm years to March 5 in cold years. The growing season is trending shorter by about 12.88 days per decade. San Joaquin County scores 43/100 (Moderate) on the Microclimate Index.
🌡️ Zone
9a (20°F to 25°F min)
❄️ Last Frost
February 4
🍂 First Frost
December 6
📅 Growing Season
306 days
⛰️ Elevation
220 ft
🌧️ Annual Rainfall
15 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 | 2.9 in | 11 days | — | None |
| Feb | 3.1 in | 8 days | 1.2 in | Moderate |
| Mar | 2.6 in | 8 days | 1.7 in | High |
| Apr | 1.2 in | 4 days | 3.1 in | Critical |
| May | 0.4 in | 1 days | 3.9 in | Critical |
| Jun | 0.1 in | 1 days | 4.2 in | Critical |
| Jul | 0 in | 0 days | 4.3 in | Critical |
| Aug | 0 in | 0 days | 4.3 in | Critical |
| Sep | 0.2 in | 1 days | 4.1 in | Critical |
| Oct | 0.7 in | 3 days | 3.6 in | Critical |
| Nov | 1.3 in | 5 days | 3 in | High |
| Dec | 2.6 in | 8 days | — | None |
Annual total: 15.1 in. Gardens typically need ~1 inch of water per week during the growing season. Months marked "None" for extra water are outside the active growing season for your zone — most gardens are dormant and don't need irrigation during those months.
San Joaquin County Soil Profile
Soil Type
Loam
Soil pH
6.4-7.8
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 5 | Dec 19 | 289 days |
| Cautious | Feb 20 | Dec 15 | 298 days |
| Average year | Feb 4 | Dec 6 | 305 days |
| Optimistic | Jan 18 | Nov 29 | 315 days |
| Aggressive (risky) | Jan 4 | Nov 22 | 322 days |
Not very — frost dates can vary by ±61 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 12.9 days per decade). Use the "Conservative" dates and choose fast-maturing varieties.
Gardening Difficulty Score
San Joaquin County presents some gardening challenges. Choose adapted varieties and plan around frost dates.
Local Gardening Help in San Joaquin 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 San Joaquin County's climate and soil.
County Extension Office
San Joaquin 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 San Joaquin County
Finding local nurseries & garden centers in San Joaquin County
Why Buy Local
Local nurseries carry plants that are proven to grow in your area. Staff can give you advice specific to San Joaquin 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 San Joaquin County CA" or "garden center San Joaquin 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 San Joaquin County CA" or check your extension office and local parks department. Facebook groups like "San Joaquin 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
9.4 hours
Winter solstice daylight
Peak Sun Hours
13.4 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 | 5.5 hr | Short day |
| February | 10.6 hr | 6.6 hr | Short day |
| March | 11.7 hr | 7.6 hr | Short day |
| April | 13 hr | 9 hr | Neutral |
| May | 14 hr | 11.6 hr | Long day |
| June | 14.6 hr | 13.2 hr | Long day |
| July | 14.4 hr | 13.4 hr | Long day |
| August | 13.5 hr | 12 hr | Neutral |
| September | 12.2 hr | 10.6 hr | Neutral |
| October | 11 hr | 8 hr | Short day |
| November | 9.9 hr | 5.9 hr | Short day |
| December | 9.4 hr | 5.4 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 Mar 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 | 50°F | 58°F | ♻️ Active | ~14 weeks |
| Feb | 52°F | 56°F | ♻️ Active | ~14 weeks |
| Mar | 60°F | 62°F | ♻️ Active | ~14 weeks |
| Apr | 67°F | 67°F | 🔥 Peak | ~8 weeks |
| May | 77°F | 73°F | 🔥 Peak | ~8 weeks |
| Jun | 84°F | 83°F | 🔥 Peak | ~8 weeks |
| Jul | 93°F | 88°F | 🔥 Peak | ~8 weeks |
| Aug | 95°F | 92°F | 🔥 Peak | ~8 weeks |
| Sep | 91°F | 88°F | 🔥 Peak | ~8 weeks |
| Oct | 80°F | 82°F | 🔥 Peak | ~8 weeks |
| Nov | 66°F | 72°F | 🔥 Peak | ~8 weeks |
| Dec | 57°F | 62°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 San Joaquin 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
Low disease risk — dry conditions reduce fungal problems.
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 | High | Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov |
| Thrips | Moderate | Apr, May, Jun, Jul, Aug |
| Leaf miners | Low | Mar, Apr, May, Jun |
Organic pest management tips
- Use row covers on susceptible crops during peak pest months
- Apply neem oil preventatively every 7-14 days during active pest season
- Interplant with strong-scented herbs (basil, marigold) to confuse pests
- Hand-pick larger pests (beetles, caterpillars) in early morning when they're sluggish
- Practice crop rotation — never plant the same family in the same spot within 3 years
Cover Crops for San Joaquin County
Cover crops protect bare soil, fix nitrogen, suppress weeds, and improve soil structure — with county-specific planting dates.
Fall Cover Crops (4 options) — Plant after harvest to protect soil over winter
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Austrian winter peas | Oct 14 | Jan 21 | ✓ Yes | Fixes nitrogen, good for heavy clay soils |
| Crimson clover | Oct 11 | Jan 14 | ✓ Yes | Fixes nitrogen, attracts pollinators in spring |
| Daikon radish | Oct 10 | Jan 21 | — | Deep taproot breaks compaction, excellent for clay soils |
| Hairy vetch | Sep 25 | Jan 14 | ✓ Yes | Excellent nitrogen fixer, good for depleted soils |
Spring Cover Crops (4 options) — Build soil before the main growing season
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Buckwheat | Feb 6 | Oct 4 | — | Rapid growth, attracts pollinators, suppresses weeds |
| Cowpeas (southern peas) | Feb 13 | Sep 27 | ✓ Yes | Excellent nitrogen fixer for warm climates, edible |
| Sorghum-sudan grass | Feb 8 | Sep 27 | — | Massive biomass, breaks compaction, suppresses nematodes |
| White clover | Jan 10 | Oct 4 | ✓ 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 23 | Nov 15 | — | Deep roots break compaction, attract pollinators and beneficial insects |
Wind & Microclimate
Wind dries soil, stresses plants, and affects frost patterns. Understanding your exposure helps with garden placement.
Seasonal Wind Speed
Spring: 10 mph Summer: 11 mph
Fall: 8 mph Winter: 7 mph
Prevailing wind: W. Moderate wind — consider a temporary windbreak for young seedlings.
Windbreak Benefit
3.3/10
Low need — wind is not a major factor in your garden planning.
Frost Pocket Risk
Moderate
Some terrain variation (824 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
7,525 gal
Per 1,000 sq ft of roof area (at 80% collection efficiency)
Recommended Setup
8 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
May, Jun, Jul, Aug, Sep, Oct
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 15.1 inches of rain per year
- A 1,000 sq ft roof can collect roughly 7,525 gallons annually
- Rainwater harvesting is fully legal in your state
- In your dry climate, every drop counts — consider a larger cistern system
- Position collection tanks in shade to reduce evaporation and algae growth
Soil & Growing Conditions in San Joaquin County
Soil Type
Loam
Soil pH 6.4–7.8 · Well 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
306-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 San Joaquin County
115 vegetables that grow well in Zone 9a with planting dates for San Joaquin County.
Show all 115 vegetables with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Acorn Squash | Jan 7 | Feb 4 | Feb 11 | May 6 – Jun 10 | 80–100 |
| Amaranth | Dec 24 | Feb 4 | Feb 11 | May 13 – Jul 1 | 90–120 |
| Artichoke | — | — | Feb 18 | Jun 24 – Sep 2 | 120–180 |
| Arugula | Jan 7 | Jan 14 | Feb 4 | Mar 11 – May 13 | 30–50 |
| Asparagus | — | — | Feb 18 | — | 730–1095 |
| Beets | — | Jan 14 | — | Mar 11 – Apr 8 | 50–70 |
| Belgian Endive | Jan 7 | Jan 14 | Feb 4 | May 27 – Jul 22 | 110–150 |
| Bitter Melon | Dec 24 | Feb 4 | Feb 11 | Apr 15 – May 27 | 60–90 |
| Black Beans | — | Feb 11 | — | May 13 – Jul 1 | 90–120 |
| Bok Choy | Jan 7 | Jan 14 | Feb 4 | Mar 18 – Apr 22 | 40–60 |
| Broccoli | Jan 7 | Jan 14 | Feb 4 | Apr 8 – May 20 | 60–90 |
| Broccoli Rabe | Jan 7 | Jan 14 | Feb 4 | Mar 18 – Apr 22 | 40–60 |
| Brussels Sprouts | Jan 7 | Jan 14 | Feb 4 | May 6 – Jul 1 | 90–130 |
| Butternut Squash | Jan 7 | Feb 4 | Feb 11 | May 13 – Jun 17 | 85–110 |
| Cabbage | Jan 7 | Jan 14 | Feb 4 | Apr 8 – Jun 3 | 60–100 |
| Calabash | Dec 24 | Feb 4 | Feb 11 | May 6 – Jul 1 | 80–120 |
| Cardoon | — | — | Feb 18 | Jun 24 – Aug 5 | 120–150 |
| Carrots | — | Jan 14 | — | Mar 18 – Apr 22 | 60–80 |
| Cauliflower | Jan 7 | Jan 14 | Feb 4 | Apr 1 – Jun 3 | 55–100 |
| Celeriac | Jan 7 | Jan 14 | Feb 4 | May 20 – Jun 24 | 100–120 |
| Celery | Jan 7 | Jan 14 | Feb 4 | Apr 29 – Jun 24 | 80–120 |
| Celtuce | Jan 7 | Jan 14 | Feb 4 | Apr 8 – May 20 | 60–90 |
| Chard | Jan 7 | Jan 14 | Feb 4 | Apr 1 – May 20 | 50–60 |
| Chayote | Dec 24 | Feb 4 | Feb 11 | Jun 17 – Aug 26 | 120–180 |
| Chickpeas | Jan 7 | Jan 14 | Feb 4 | Apr 29 – Jun 10 | 80–110 |
| Chicory | Jan 7 | Jan 14 | Feb 4 | Apr 8 – May 20 | 60–85 |
| Chinese Cabbage | Jan 7 | Jan 14 | Feb 4 | Apr 1 – Apr 29 | 50–70 |
| Christmas Lima Beans | Dec 24 | Feb 4 | Feb 11 | May 6 – Jun 10 | 80–100 |
| Collard Greens | Jan 7 | Jan 14 | Feb 4 | Apr 1 – Jun 3 | 55–75 |
| Corn | — | Feb 11 | — | Apr 15 – Jun 10 | 60–100 |
| Cowpeas | — | Feb 11 | — | Apr 15 – May 27 | 60–90 |
| Cress | Jan 7 | Jan 14 | Feb 4 | Feb 18 – Mar 11 | 14–21 |
| Crookneck Squash | Jan 7 | Feb 4 | Feb 11 | Apr 1 – Apr 29 | 45–60 |
| Crosne | — | Jan 14 | — | Jun 17 – Aug 19 | 150–200 |
| Cucumber | Jan 7 | Feb 4 | Feb 11 | Apr 8 – Jun 3 | 50–70 |
| Daikon | — | Jan 14 | — | Mar 11 – Apr 8 | 50–70 |
| Delicata Squash | Jan 7 | Feb 4 | Feb 11 | May 6 – Jun 10 | 80–100 |
| Edamame | — | Feb 11 | — | Apr 29 – Jun 10 | 75–100 |
| Eggplant | Dec 24 | Feb 4 | Feb 11 | Apr 22 – Jun 24 | 65–85 |
| Endive | Jan 7 | Jan 14 | Feb 4 | Mar 25 – Apr 29 | 45–65 |
| Escarole | Jan 7 | Jan 14 | Feb 4 | Apr 1 – Apr 29 | 50–70 |
| Fava Beans | Jan 7 | Jan 14 | Feb 4 | Apr 22 – Jun 3 | 75–100 |
| Fennel | Dec 24 | Feb 4 | Feb 11 | Apr 15 – May 27 | 60–90 |
| Garlic | — | — | — | — | 90–240 |
| Ginger | Dec 24 | Feb 4 | Feb 11 | Oct 14 – Dec 9 | 240–300 |
| Green Beans | — | Feb 11 | — | Apr 8 – Jun 3 | 50–65 |
| Horseradish | — | — | Feb 18 | Jun 24 – Sep 2 | 120–180 |
| Hot Peppers | Dec 24 | Feb 4 | Feb 11 | Apr 22 – Jul 29 | 70–120 |
| Hubbard Squash | Jan 7 | Feb 4 | Feb 11 | May 27 – Jul 1 | 100–120 |
| Jicama | Dec 24 | Feb 4 | Feb 11 | Jun 17 – Aug 26 | 120–180 |
| Kabocha | Jan 7 | Feb 4 | Feb 11 | May 13 – Jun 10 | 85–100 |
| Kai Lan | Jan 7 | Jan 14 | Feb 4 | Mar 25 – Apr 22 | 45–60 |
| Kale | Jan 7 | Jan 14 | Feb 4 | Apr 1 – May 27 | 50–70 |
| Kidney Beans | — | Feb 11 | — | May 13 – Jun 17 | 85–110 |
| Kohlrabi | Jan 7 | Jan 14 | Feb 4 | Mar 25 – Apr 29 | 45–65 |
| Komatsuna | Jan 7 | Jan 14 | Feb 4 | Mar 11 – Apr 15 | 35–50 |
| Leeks | Jan 7 | Jan 14 | Feb 4 | May 6 – Jul 22 | 90–150 |
| Lentils | Jan 7 | Jan 14 | Feb 4 | Apr 29 – Jun 10 | 80–110 |
| Lettuce | Jan 7 | Jan 14 | Feb 4 | Mar 11 – May 20 | 30–60 |
| Lima Beans | — | Feb 11 | — | Apr 15 – May 27 | 60–90 |
| Loofah | Dec 24 | Feb 4 | Feb 11 | May 27 – Jul 29 | 100–150 |
| Luffa | Dec 24 | Feb 4 | Feb 11 | May 13 – Jul 29 | 90–150 |
| Mache | Jan 7 | Jan 14 | Feb 4 | Mar 18 – Apr 22 | 40–60 |
| Malabar Spinach | Dec 24 | Feb 4 | Feb 11 | Apr 8 – May 6 | 55–70 |
| Melon | Jan 7 | Feb 4 | Feb 11 | Apr 22 – Jun 10 | 70–100 |
| Microgreens | Jan 7 | Jan 14 | Feb 4 | Feb 11 – Mar 11 | 7–21 |
| Mitsuba | Jan 7 | Jan 14 | Jan 28 | Mar 25 – May 20 | 50–70 |
| Mizuna | Jan 7 | Jan 14 | Feb 4 | Mar 11 – Apr 8 | 30–45 |
| Mustard Greens | Jan 7 | Jan 14 | Feb 4 | Mar 11 – May 13 | 30–50 |
| Napa Cabbage | Jan 7 | Jan 14 | Feb 4 | Apr 1 – May 6 | 55–75 |
| New Zealand Spinach | Dec 24 | Feb 4 | Feb 11 | Apr 8 – May 6 | 55–70 |
| Okra | Dec 24 | Feb 4 | Feb 11 | Apr 8 – Jun 3 | 50–65 |
| Onion | Jan 7 | Jan 14 | Feb 4 | May 6 – Jun 24 | 90–120 |
| Pac Choi | Jan 7 | Jan 14 | Feb 4 | Mar 18 – Apr 15 | 40–55 |
| Parsnip | — | Jan 14 | — | Apr 29 – Jun 10 | 100–130 |
| Patty Pan Squash | Jan 7 | Feb 4 | Feb 11 | Apr 1 – Apr 29 | 45–60 |
| Peas | Jan 7 | Jan 14 | Feb 4 | Apr 1 – May 27 | 55–70 |
| Peppers | Dec 24 | Feb 4 | Feb 11 | Apr 15 – Jun 24 | 60–90 |
| Pole Beans | Dec 24 | Feb 4 | Feb 11 | Apr 8 – Jun 3 | 55–70 |
| Potatoes | Dec 24 | Feb 4 | Feb 11 | Apr 22 – Jul 1 | 70–120 |
| Pumpkin | Jan 7 | Feb 4 | Feb 11 | May 13 – Jul 1 | 85–120 |
| Purslane | Jan 7 | Jan 14 | Feb 4 | Mar 18 – Apr 22 | 40–60 |
| Radicchio | Jan 7 | Jan 14 | Feb 4 | Apr 8 – May 13 | 60–80 |
| Radish | — | Jan 14 | — | Feb 11 – Mar 4 | 22–35 |
| Romanesco | Jan 7 | Jan 14 | Feb 4 | Apr 22 – Jun 3 | 75–100 |
| Rutabaga | — | Jan 14 | — | Apr 8 – May 13 | 80–100 |
| Salsify | — | Jan 14 | — | Apr 29 – Jun 10 | 100–130 |
| Savoy Cabbage | Jan 7 | Jan 14 | Feb 4 | Apr 15 – Jun 10 | 70–110 |
| Scallions | Jan 7 | Jan 14 | Feb 4 | Apr 1 – Apr 29 | 50–70 |
| Scarlet Runner Beans | Dec 24 | Feb 4 | Feb 11 | Apr 15 – May 20 | 60–80 |
| Shallot | Jan 7 | Jan 14 | Feb 4 | May 6 – Jun 24 | 90–120 |
| Shiso | Dec 24 | Feb 11 | Feb 11 | Apr 8 – Jun 3 | 50–70 |
| Snap Peas | Dec 24 | Feb 4 | Feb 11 | Apr 8 – Jun 3 | 55–70 |
| Snow Peas | Jan 7 | Jan 14 | Feb 4 | Apr 1 – May 27 | 50–65 |
| Soybeans | — | Feb 11 | — | May 6 – Jul 1 | 80–120 |
| Spaghetti Squash | Jan 7 | Feb 4 | Feb 11 | May 13 – Jun 10 | 85–100 |
| Spinach | Jan 7 | Jan 14 | Feb 4 | Mar 11 – May 13 | 35–50 |
| Squash (Summer) | Jan 7 | Feb 4 | Feb 11 | Apr 1 – Jun 3 | 45–65 |
| Squash (Winter) | Jan 7 | Feb 4 | Feb 11 | May 6 – Jul 1 | 80–120 |
| Sunchoke | — | — | Feb 18 | Jun 10 – Aug 5 | 110–150 |
| Sunflower | Dec 24 | Feb 4 | Feb 11 | Apr 22 – Jun 10 | 70–100 |
| Sweet Corn | — | Feb 11 | — | Apr 15 – May 27 | 60–90 |
| Sweet Potatoes | Dec 24 | Feb 4 | Feb 11 | May 13 – Jul 1 | 90–120 |
| Tatsoi | Jan 7 | Jan 14 | Feb 4 | Mar 11 – Apr 15 | 35–50 |
| Tomatillo | Dec 24 | Feb 4 | Feb 11 | Apr 15 – Jun 24 | 60–85 |
| Tomatoes | Dec 24 | Feb 4 | Feb 11 | Apr 15 – Jun 24 | 60–85 |
| Turmeric | Dec 24 | Feb 4 | Feb 11 | Oct 14 – Dec 9 | 240–300 |
| Turnip | — | Jan 14 | — | Feb 25 – Apr 1 | 40–60 |
| Watercress | Jan 7 | Jan 14 | Feb 4 | Mar 18 – Apr 22 | 40–60 |
| Watermelon | Jan 7 | Feb 4 | Feb 11 | Apr 22 – Jun 10 | 70–100 |
| Wax Beans | — | Feb 11 | — | Apr 8 – Jun 3 | 50–65 |
| Winter Melon | Dec 24 | Feb 4 | Feb 11 | May 13 – Jul 1 | 90–120 |
| Yam | Dec 24 | Feb 4 | Feb 11 | Aug 12 – Dec 9 | 180–330 |
| Yard Long Beans | Dec 24 | Feb 4 | Feb 11 | Apr 8 – May 20 | 55–80 |
| Zucchini | Jan 7 | Feb 4 | Feb 11 | Apr 1 – May 27 | 45–60 |
🍓 Fruits to Grow in San Joaquin County
24 fruits that grow well in Zone 9a with planting dates for San Joaquin County.
Show all 24 fruits with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Alpine Strawberries | — | — | Feb 18 | May 20 – Sep 2 | 90–180 |
| Blackberries | — | — | Feb 18 | — | 365–730 |
| Boysenberries | — | — | Feb 18 | — | 365–730 |
| Cantaloupe | — | — | Feb 18 | Apr 29 – Jun 3 | 70–90 |
| Che Fruit | — | — | Feb 18 | — | 1095–1825 |
| Dragon Fruit | — | — | Feb 18 | — | 365–730 |
| Elderberries | — | — | Feb 18 | — | 730–1095 |
| Figs | — | — | Feb 18 | — | 730–1825 |
| Goji Berries | — | — | Feb 18 | — | 730–1095 |
| Grapes | — | — | Feb 18 | — | 730–1095 |
| Ground Cherry | — | — | Feb 18 | Apr 29 – Jun 24 | 65–80 |
| Guava | — | — | Feb 18 | — | 365–730 |
| Honeydew | — | — | Feb 18 | May 13 – Jun 24 | 80–110 |
| Kiwi | — | — | Feb 18 | — | 1095–1825 |
| Loquat | — | — | Feb 18 | — | 730–1825 |
| Mulberries | — | — | Feb 18 | — | 730–1825 |
| Passion Fruit | — | — | Feb 18 | — | 365–545 |
| Pawpaw | — | — | Feb 18 | — | 1095–2555 |
| Persimmon | — | — | Feb 18 | — | 1095–2555 |
| Pomegranate | — | — | Feb 18 | — | 730–1095 |
| Quince | — | — | Feb 18 | — | 1095–1825 |
| Raspberries | — | — | Feb 18 | — | 365–730 |
| Serviceberries | — | — | Feb 18 | — | 730–1095 |
| Strawberries | — | — | Feb 18 | May 20 – Dec 16 | 90–365 |
🌿 Herbs to Grow in San Joaquin County
40 herbs that grow well in Zone 9a with planting dates for San Joaquin County.
Show all 40 herbs with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Anise | Jan 7 | Jan 14 | Jan 28 | Apr 29 – Jul 15 | 90–120 |
| Basil | Dec 24 | Feb 11 | Feb 11 | Apr 8 – Jun 10 | 50–75 |
| Bee Balm | — | — | Feb 11 | May 13 – Jul 29 | 90–120 |
| Borage | Jan 7 | Jan 14 | Jan 28 | Mar 25 – May 13 | 50–60 |
| Caraway | Jan 7 | Jan 14 | Jan 28 | — | 365–450 |
| Catnip | — | — | Feb 11 | Apr 15 – Jun 17 | 60–80 |
| Chamomile | Jan 7 | Jan 14 | Jan 28 | Apr 1 – Jun 10 | 60–90 |
| Chervil | Jan 7 | Jan 14 | Jan 28 | Mar 11 – May 13 | 40–60 |
| Chives | — | — | Feb 11 | Apr 15 – Jun 24 | 60–90 |
| Cilantro | Jan 7 | Jan 14 | Jan 28 | Mar 11 – May 13 | 40–60 |
| Comfrey | — | — | Feb 11 | Apr 15 – Jun 24 | 60–90 |
| Cumin | Jan 7 | Jan 14 | Jan 28 | May 13 – Jul 15 | 100–120 |
| Dill | Jan 7 | Jan 14 | Jan 28 | Mar 11 – May 13 | 40–60 |
| Echinacea | — | — | Feb 11 | Jun 17 – Sep 23 | 120–180 |
| Epazote | Dec 24 | Feb 11 | Feb 11 | Apr 1 – May 27 | 45–60 |
| Fennel (herb) | Jan 7 | Jan 14 | Jan 28 | Apr 1 – Jun 10 | 60–90 |
| Feverfew | — | — | Feb 11 | May 13 – Jul 29 | 90–120 |
| Garlic Chives | — | — | Feb 11 | Apr 15 – Jun 24 | 60–90 |
| Horehound | — | — | Feb 11 | Apr 29 – Jun 24 | 75–90 |
| Hyssop | — | — | Feb 11 | Apr 22 – Jun 24 | 70–90 |
| Lavender | — | — | Feb 11 | May 13 – Oct 14 | 90–200 |
| Lemon Balm | — | — | Feb 11 | Apr 15 – Jun 3 | 60–70 |
| Lemon Thyme | — | — | Feb 11 | Apr 22 – Jun 24 | 70–90 |
| Lemon Verbena | Dec 24 | Feb 11 | Feb 11 | Apr 15 – Jun 24 | 60–90 |
| Lemongrass | Dec 24 | Feb 11 | Feb 11 | Apr 29 – Jul 29 | 75–120 |
| Marjoram | — | — | Feb 11 | Apr 15 – Jun 24 | 60–90 |
| Mint | — | — | Feb 11 | Apr 15 – Jun 24 | 60–90 |
| Oregano | — | — | Feb 11 | Apr 15 – Jun 24 | 60–90 |
| Parsley | Jan 7 | Jan 14 | Jan 28 | Apr 1 – Jun 3 | 60–80 |
| Rosemary | — | — | Feb 11 | May 6 – Sep 23 | 80–180 |
| Rue | — | — | Feb 11 | Apr 22 – Jun 24 | 70–90 |
| Sage | — | — | Feb 11 | Apr 29 – Jun 24 | 75–90 |
| Savory | — | — | Feb 11 | Apr 8 – Jun 3 | 50–70 |
| Sorrel | Jan 7 | Jan 14 | Jan 28 | Mar 11 – May 13 | 40–60 |
| Stevia | Dec 24 | Feb 11 | Feb 11 | Apr 15 – Jun 24 | 60–90 |
| Tarragon | — | — | Feb 11 | Apr 15 – Jun 24 | 60–90 |
| Thai Basil | Dec 24 | Feb 11 | Feb 11 | Apr 8 – Jun 10 | 50–75 |
| Thyme | — | — | Feb 11 | Apr 22 – Jun 24 | 70–90 |
| Valerian | — | — | Feb 11 | Jun 17 – Sep 23 | 120–180 |
| Yarrow | — | — | Feb 11 | May 13 – Jul 29 | 90–120 |
Monthly Planting Guide for San Joaquin County
Gardening Guides & Resources
Helpful guides from The Ultimate Homestead to improve your garden in San Joaquin County.
Frequently Asked Questions
What planting zone is San Joaquin County, CA?
San Joaquin 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 San Joaquin County, CA?
Based on 29 years of NOAA weather station data, the median last spring frost in San Joaquin County falls around February 4. In 8 out of 10 years, last frost lands between January 4 and March 5 — a 61-day window of variability. Use March 5 as your conservative safe-to-plant date for frost-sensitive crops.
When is the first fall frost in San Joaquin County, CA?
The median first fall frost in San Joaquin County arrives around December 6. In cold years it can arrive as early as November 22; 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 San Joaquin County?
San Joaquin County has a frost-free growing season of approximately 306 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 12.88 days per decade.
What is the soil like in San Joaquin County for gardening?
San Joaquin County has predominantly Loam soil with a pH range of 6.4–7.8 and Well Drained drainage. Most vegetables and herbs grow well with standard composting and seasonal soil amendment.
What is grown commercially in San Joaquin County?
San Joaquin County has commercial agriculture that includes Grapes, Almonds, Dairy, Rice, Lettuce. These crops reflect the local climate and soil conditions — what succeeds commercially often translates well to home gardens in the same area.
Is San Joaquin County a good location for home gardening?
San Joaquin County scores 43/100 (Moderate) on our Microclimate Index, which combines frost reliability, drought pressure, soil challenge, elevation risk, and long-term climate trend. Gardening here benefits from close attention to frost timing and season extension due to the challenging microclimate factors.
Plan Your Garden with Confidence
Get our free Garden Planner — designed to help San Joaquin 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.
