Mariposa County, CA — Planting Guide
Your May gardening checklist
Welcome to May in Zone 9b. These are the moves that will have the biggest impact on your growing season.
-
Time to transplant alpine strawberries, artichoke, and asparagus
Frost risk is low now in Mariposa County, California. If you've been covering beds overnight, you can stop.
-
Start basil, cucumber, and kale under lights
A seed-starting mix and a sunny window (or a grow light) are all you need. Keep soil warm — around 70°F — for fast germination.
-
Bring in the carrots, lettuce, and radish
This is the payoff month. Bring a basket, bring a friend, and get into the beds.
Before June arrives, get these ready
- First harvests: basil, carrots, and cucumber
Mariposa County is in USDA Zone 9b. The average last spring frost is April 18 and the first fall frost is November 9, giving you a growing season of approximately 205 days.
At an elevation of 192 ft, Mariposa County receives approximately 19.2 in of rainfall annually. Summer highs average 91°F with winter lows around 29°F. The predominant soil type is Loam.
Based on 28 years of NOAA climate station data, the last frost date here varies by 93 days year to year — ranging from February 15 in warm years to May 18 in cold years. The growing season is trending longer by about 5.58 days per decade. Mariposa County scores 45/100 (Moderate) on the Microclimate Index.
🌡️ Zone
9b (°F to °F min)
❄️ Last Frost
April 18
🍂 First Frost
November 9
📅 Growing Season
205 days
⛰️ Elevation
192 ft
🌧️ Annual Rainfall
19.2 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 | 3.7 in | 10 days | — | None |
| Feb | 4.3 in | 9 days | — | None |
| Mar | 3.2 in | 8 days | 1.1 in | Moderate |
| Apr | 1.6 in | 5 days | 2.7 in | High |
| May | 0.5 in | 1 days | 3.8 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 | 0 days | 4.1 in | Critical |
| Oct | 0.9 in | 3 days | 3.4 in | Critical |
| Nov | 1.9 in | 6 days | — | None |
| Dec | 2.8 in | 9 days | — | None |
Annual total: 19.2 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.
Mariposa County Soil Profile
Soil Type
Loam
Soil pH
6.5-7.5
Drainage
Well Drained
Frost Risk Probability
Based on 28 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) | May 18 | Dec 3 | 199 days |
| Cautious | Apr 26 | Nov 22 | 210 days |
| Average year | Apr 18 | Nov 9 | 205 days |
| Optimistic | Mar 24 | Oct 30 | 220 days |
| Aggressive (risky) | Feb 15 | Oct 11 | 238 days |
Not very — frost dates can vary by ±93 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 longer here (about 5.6 days per decade). Spring is arriving earlier than it used to. Good news for gardeners.
Gardening Difficulty Score
Mariposa County presents some gardening challenges. Choose adapted varieties and plan around frost dates.
Local Gardening Help in Mariposa 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 Mariposa County's climate and soil.
County Extension Office
Mariposa 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 Mariposa County
Finding local nurseries & garden centers in Mariposa County
Why Buy Local
Local nurseries carry plants that are proven to grow in your area. Staff can give you advice specific to Mariposa 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 Mariposa County CA" or "garden center Mariposa 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 Mariposa County CA" or check your extension office and local parks department. Facebook groups like "Mariposa 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
13.5 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 | 9.7 hr | 5.6 hr | Short day |
| February | 10.6 hr | 6.4 hr | Short day |
| March | 11.7 hr | 7.8 hr | Short day |
| April | 13 hr | 9.3 hr | Neutral |
| May | 14 hr | 11.5 hr | Long day |
| June | 14.6 hr | 13.1 hr | Long day |
| July | 14.4 hr | 13.5 hr | Long day |
| August | 13.5 hr | 12.3 hr | Neutral |
| September | 12.2 hr | 10.3 hr | Neutral |
| October | 11 hr | 8.2 hr | Short day |
| November | 9.9 hr | 5.9 hr | Short day |
| December | 9.4 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 May through Oct.
Best Month to Compost
May
Microbial activity peaks when soil is warm.
Active Composting
8 months
Nearly year-round composting.
View detailed monthly data
| Month | Soil 4" Deep | Soil 8" Deep | Compost Activity | Time to Finish |
|---|---|---|---|---|
| Jan | 38°F | 46°F | ❄️ Dormant | ~36 weeks |
| Feb | 40°F | 44°F | ❄️ Dormant | ~36 weeks |
| Mar | 47°F | 49°F | 🐢 Slow | ~24 weeks |
| Apr | 58°F | 57°F | ♻️ Active | ~14 weeks |
| May | 68°F | 65°F | 🔥 Peak | ~8 weeks |
| Jun | 77°F | 74°F | 🔥 Peak | ~8 weeks |
| Jul | 86°F | 81°F | 🔥 Peak | ~8 weeks |
| Aug | 87°F | 82°F | 🔥 Peak | ~8 weeks |
| Sep | 82°F | 78°F | 🔥 Peak | ~8 weeks |
| Oct | 70°F | 73°F | 🔥 Peak | ~8 weeks |
| Nov | 57°F | 61°F | ♻️ Active | ~14 weeks |
| Dec | 43°F | 52°F | 🐢 Slow | ~24 weeks |
Highlighted rows = soil 60°F+ (safe for warm-season transplants). Compost finishes fastest during peak activity months.
Pest & Disease Pressure in Mariposa County
Computed from local climate patterns — warmer, humid conditions increase pest generations and fungal disease risk.
Insect Pest Pressure
Moderate — common pests appear but manageable with monitoring.
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 | Mar, Apr, May, Jun, Jul, Aug, Sep, Oct |
| Japanese beetles | Moderate | Jun, Jul, Aug |
| Squash vine borers | High | May, Jun, Jul |
| Stink bugs | High | May, Jun, Jul, Aug, Sep |
| Whiteflies | Moderate | Jun, Jul, Aug, Sep |
| Spider mites | Moderate | Jul, Aug |
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 Mariposa 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 | Apr 26 | Sep 14 | — | Rapid growth, attracts pollinators, suppresses weeds |
| Cowpeas (southern peas) | Apr 26 | Sep 7 | ✓ Yes | Excellent nitrogen fixer for warm climates, edible |
| Sorghum-sudan grass | Apr 25 | Sep 14 | — | Massive biomass, breaks compaction, suppresses nematodes |
| White clover | Mar 18 | Aug 31 | ✓ 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 | May 13 | Oct 19 | — | Deep roots break compaction, attract pollinators and beneficial insects |
Fall Cover Crops (7 options) — Plant after harvest to protect soil over winter
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Austrian winter peas | Aug 29 | Mar 28 | ✓ Yes | Fixes nitrogen, good for heavy clay soils |
| Crimson clover | Aug 31 | Mar 28 | ✓ Yes | Fixes nitrogen, attracts pollinators in spring |
| Daikon radish | Sep 19 | Apr 4 | — | Deep taproot breaks compaction, excellent for clay soils |
| Hairy vetch | Sep 3 | Mar 28 | ✓ Yes | Excellent nitrogen fixer, good for depleted soils |
| Oats | Oct 4 | Apr 4 | — | Quick biomass, winterkills in cold zones — no spring tillage needed |
| Winter rye | Aug 6 | Mar 28 | — | Suppresses weeds, prevents erosion, breaks up compacted soil |
| Winter wheat | Aug 9 | Mar 28 | — | Erosion control, weed suppression, good biomass |
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: 10 mph
Fall: 9 mph Winter: 8 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 (744 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
9,569 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 19.2 inches of rain per year
- A 1,000 sq ft roof can collect roughly 9,569 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 Mariposa County
Soil Type
Loam
Soil pH 6.5–7.5 · 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
205-day frost-free season
Plenty of time for warm-season crops. Start heat-lovers indoors 6–8 weeks before last frost to maximise your harvest window.
Your Free Printable Garden Planner
Plan every bed, every planting, every harvest — in one place. This 24-page printable includes your zone's planting calendar, a month-by-month task list, a seed inventory tracker, a harvest log, and succession-planting charts. Built to print, write in, and actually use all season.
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 Mariposa County
115 vegetables that grow well in Zone 9b with planting dates for Mariposa County.
Show all 115 vegetables with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Acorn Squash | Mar 21 | Apr 18 | Apr 25 | Jul 18 – Aug 22 | 80–100 |
| Amaranth | Mar 7 | Apr 18 | Apr 25 | Jul 25 – Sep 12 | 90–120 |
| Artichoke | — | — | May 2 | Sep 5 – Nov 14 | 120–180 |
| Arugula | Mar 21 | Mar 28 | Apr 18 | May 23 – Jul 25 | 30–50 |
| Asparagus | — | — | May 2 | — | 730–1095 |
| Beets | — | Mar 28 | — | May 23 – Jun 20 | 50–70 |
| Belgian Endive | Mar 21 | Mar 28 | Apr 18 | Aug 8 – Oct 3 | 110–150 |
| Bitter Melon | Mar 7 | Apr 18 | Apr 25 | Jun 27 – Aug 8 | 60–90 |
| Black Beans | — | Apr 25 | — | Jul 25 – Sep 12 | 90–120 |
| Bok Choy | Mar 21 | Mar 28 | Apr 18 | May 30 – Jul 4 | 40–60 |
| Broccoli | Mar 21 | Mar 28 | Apr 18 | Jun 20 – Aug 1 | 60–90 |
| Broccoli Rabe | Mar 21 | Mar 28 | Apr 18 | May 30 – Jul 4 | 40–60 |
| Brussels Sprouts | Mar 21 | Mar 28 | Apr 18 | Jul 18 – Sep 12 | 90–130 |
| Butternut Squash | Mar 21 | Apr 18 | Apr 25 | Jul 25 – Aug 29 | 85–110 |
| Cabbage | Mar 21 | Mar 28 | Apr 18 | Jun 20 – Aug 15 | 60–100 |
| Calabash | Mar 7 | Apr 18 | Apr 25 | Jul 18 – Sep 12 | 80–120 |
| Cardoon | — | — | May 2 | Sep 5 – Oct 17 | 120–150 |
| Carrots | — | Mar 28 | — | May 30 – Jul 4 | 60–80 |
| Cauliflower | Mar 21 | Mar 28 | Apr 18 | Jun 13 – Aug 15 | 55–100 |
| Celeriac | Mar 21 | Mar 28 | Apr 18 | Aug 1 – Sep 5 | 100–120 |
| Celery | Mar 21 | Mar 28 | Apr 18 | Jul 11 – Sep 5 | 80–120 |
| Celtuce | Mar 21 | Mar 28 | Apr 18 | Jun 20 – Aug 1 | 60–90 |
| Chard | Mar 21 | Mar 28 | Apr 18 | Jun 13 – Aug 1 | 50–60 |
| Chayote | Mar 7 | Apr 18 | Apr 25 | Aug 29 – Nov 7 | 120–180 |
| Chickpeas | Mar 21 | Mar 28 | Apr 18 | Jul 11 – Aug 22 | 80–110 |
| Chicory | Mar 21 | Mar 28 | Apr 18 | Jun 20 – Aug 1 | 60–85 |
| Chinese Cabbage | Mar 21 | Mar 28 | Apr 18 | Jun 13 – Jul 11 | 50–70 |
| Christmas Lima Beans | Mar 7 | Apr 18 | Apr 25 | Jul 18 – Aug 22 | 80–100 |
| Collard Greens | Mar 21 | Mar 28 | Apr 18 | Jun 13 – Aug 15 | 55–75 |
| Corn | — | Apr 25 | — | Jun 27 – Aug 22 | 60–100 |
| Cowpeas | — | Apr 25 | — | Jun 27 – Aug 8 | 60–90 |
| Cress | Mar 21 | Mar 28 | Apr 18 | May 2 – May 23 | 14–21 |
| Crookneck Squash | Mar 21 | Apr 18 | Apr 25 | Jun 13 – Jul 11 | 45–60 |
| Crosne | — | Mar 28 | — | Aug 29 – Oct 31 | 150–200 |
| Cucumber | Mar 21 | Apr 18 | Apr 25 | Jun 20 – Aug 15 | 50–70 |
| Daikon | — | Mar 28 | — | May 23 – Jun 20 | 50–70 |
| Delicata Squash | Mar 21 | Apr 18 | Apr 25 | Jul 18 – Aug 22 | 80–100 |
| Edamame | — | Apr 25 | — | Jul 11 – Aug 22 | 75–100 |
| Eggplant | Mar 7 | Apr 18 | Apr 25 | Jul 4 – Sep 5 | 65–85 |
| Endive | Mar 21 | Mar 28 | Apr 18 | Jun 6 – Jul 11 | 45–65 |
| Escarole | Mar 21 | Mar 28 | Apr 18 | Jun 13 – Jul 11 | 50–70 |
| Fava Beans | Mar 21 | Mar 28 | Apr 18 | Jul 4 – Aug 15 | 75–100 |
| Fennel | Mar 7 | Apr 18 | Apr 25 | Jun 27 – Aug 8 | 60–90 |
| Garlic | — | — | — | — | 90–240 |
| Ginger | Mar 7 | Apr 18 | Apr 25 | Dec 26 – Feb 20 | 240–300 |
| Green Beans | — | Apr 25 | — | Jun 20 – Aug 15 | 50–65 |
| Horseradish | — | — | May 2 | Sep 5 – Nov 14 | 120–180 |
| Hot Peppers | Mar 7 | Apr 18 | Apr 25 | Jul 4 – Oct 10 | 70–120 |
| Hubbard Squash | Mar 21 | Apr 18 | Apr 25 | Aug 8 – Sep 12 | 100–120 |
| Jicama | Mar 7 | Apr 18 | Apr 25 | Aug 29 – Nov 7 | 120–180 |
| Kabocha | Mar 21 | Apr 18 | Apr 25 | Jul 25 – Aug 22 | 85–100 |
| Kai Lan | Mar 21 | Mar 28 | Apr 18 | Jun 6 – Jul 4 | 45–60 |
| Kale | Mar 21 | Mar 28 | Apr 18 | Jun 13 – Aug 8 | 50–70 |
| Kidney Beans | — | Apr 25 | — | Jul 25 – Aug 29 | 85–110 |
| Kohlrabi | Mar 21 | Mar 28 | Apr 18 | Jun 6 – Jul 11 | 45–65 |
| Komatsuna | Mar 21 | Mar 28 | Apr 18 | May 23 – Jun 27 | 35–50 |
| Leeks | Mar 21 | Mar 28 | Apr 18 | Jul 18 – Oct 3 | 90–150 |
| Lentils | Mar 21 | Mar 28 | Apr 18 | Jul 11 – Aug 22 | 80–110 |
| Lettuce | Mar 21 | Mar 28 | Apr 18 | May 23 – Aug 1 | 30–60 |
| Lima Beans | — | Apr 25 | — | Jun 27 – Aug 8 | 60–90 |
| Loofah | Mar 7 | Apr 18 | Apr 25 | Aug 8 – Oct 10 | 100–150 |
| Luffa | Mar 7 | Apr 18 | Apr 25 | Jul 25 – Oct 10 | 90–150 |
| Mache | Mar 21 | Mar 28 | Apr 18 | May 30 – Jul 4 | 40–60 |
| Malabar Spinach | Mar 7 | Apr 18 | Apr 25 | Jun 20 – Jul 18 | 55–70 |
| Melon | Mar 21 | Apr 18 | Apr 25 | Jul 4 – Aug 22 | 70–100 |
| Microgreens | Mar 21 | Mar 28 | Apr 18 | Apr 25 – May 23 | 7–21 |
| Mitsuba | Mar 21 | Mar 28 | Apr 11 | Jun 6 – Aug 1 | 50–70 |
| Mizuna | Mar 21 | Mar 28 | Apr 18 | May 23 – Jun 20 | 30–45 |
| Mustard Greens | Mar 21 | Mar 28 | Apr 18 | May 23 – Jul 25 | 30–50 |
| Napa Cabbage | Mar 21 | Mar 28 | Apr 18 | Jun 13 – Jul 18 | 55–75 |
| New Zealand Spinach | Mar 7 | Apr 18 | Apr 25 | Jun 20 – Jul 18 | 55–70 |
| Okra | Mar 7 | Apr 18 | Apr 25 | Jun 20 – Aug 15 | 50–65 |
| Onion | Mar 21 | Mar 28 | Apr 18 | Jul 18 – Sep 5 | 90–120 |
| Pac Choi | Mar 21 | Mar 28 | Apr 18 | May 30 – Jun 27 | 40–55 |
| Parsnip | — | Mar 28 | — | Jul 11 – Aug 22 | 100–130 |
| Patty Pan Squash | Mar 21 | Apr 18 | Apr 25 | Jun 13 – Jul 11 | 45–60 |
| Peas | Mar 21 | Mar 28 | Apr 18 | Jun 13 – Aug 8 | 55–70 |
| Peppers | Mar 7 | Apr 18 | Apr 25 | Jun 27 – Sep 5 | 60–90 |
| Pole Beans | Mar 7 | Apr 18 | Apr 25 | Jun 20 – Aug 15 | 55–70 |
| Potatoes | Mar 7 | Apr 18 | Apr 25 | Jul 4 – Sep 12 | 70–120 |
| Pumpkin | Mar 21 | Apr 18 | Apr 25 | Jul 25 – Sep 12 | 85–120 |
| Purslane | Mar 21 | Mar 28 | Apr 18 | May 30 – Jul 4 | 40–60 |
| Radicchio | Mar 21 | Mar 28 | Apr 18 | Jun 20 – Jul 25 | 60–80 |
| Radish | — | Mar 28 | — | Apr 25 – May 16 | 22–35 |
| Romanesco | Mar 21 | Mar 28 | Apr 18 | Jul 4 – Aug 15 | 75–100 |
| Rutabaga | — | Mar 28 | — | Jun 20 – Jul 25 | 80–100 |
| Salsify | — | Mar 28 | — | Jul 11 – Aug 22 | 100–130 |
| Savoy Cabbage | Mar 21 | Mar 28 | Apr 18 | Jun 27 – Aug 22 | 70–110 |
| Scallions | Mar 21 | Mar 28 | Apr 18 | Jun 13 – Jul 11 | 50–70 |
| Scarlet Runner Beans | Mar 7 | Apr 18 | Apr 25 | Jun 27 – Aug 1 | 60–80 |
| Shallot | Mar 21 | Mar 28 | Apr 18 | Jul 18 – Sep 5 | 90–120 |
| Shiso | Mar 7 | Apr 25 | Apr 25 | Jun 20 – Aug 15 | 50–70 |
| Snap Peas | Mar 7 | Apr 18 | Apr 25 | Jun 20 – Aug 15 | 55–70 |
| Snow Peas | Mar 21 | Mar 28 | Apr 18 | Jun 13 – Aug 8 | 50–65 |
| Soybeans | — | Apr 25 | — | Jul 18 – Sep 12 | 80–120 |
| Spaghetti Squash | Mar 21 | Apr 18 | Apr 25 | Jul 25 – Aug 22 | 85–100 |
| Spinach | Mar 21 | Mar 28 | Apr 18 | May 23 – Jul 25 | 35–50 |
| Squash (Summer) | Mar 21 | Apr 18 | Apr 25 | Jun 13 – Aug 15 | 45–65 |
| Squash (Winter) | Mar 21 | Apr 18 | Apr 25 | Jul 18 – Sep 12 | 80–120 |
| Sunchoke | — | — | May 2 | Aug 22 – Oct 17 | 110–150 |
| Sunflower | Mar 7 | Apr 18 | Apr 25 | Jul 4 – Aug 22 | 70–100 |
| Sweet Corn | — | Apr 25 | — | Jun 27 – Aug 8 | 60–90 |
| Sweet Potatoes | Mar 7 | Apr 18 | Apr 25 | Jul 25 – Sep 12 | 90–120 |
| Tatsoi | Mar 21 | Mar 28 | Apr 18 | May 23 – Jun 27 | 35–50 |
| Tomatillo | Mar 7 | Apr 18 | Apr 25 | Jun 27 – Sep 5 | 60–85 |
| Tomatoes | Mar 7 | Apr 18 | Apr 25 | Jun 27 – Sep 5 | 60–85 |
| Turmeric | Mar 7 | Apr 18 | Apr 25 | Dec 26 – Feb 20 | 240–300 |
| Turnip | — | Mar 28 | — | May 9 – Jun 13 | 40–60 |
| Watercress | Mar 21 | Mar 28 | Apr 18 | May 30 – Jul 4 | 40–60 |
| Watermelon | Mar 21 | Apr 18 | Apr 25 | Jul 4 – Aug 22 | 70–100 |
| Wax Beans | — | Apr 25 | — | Jun 20 – Aug 15 | 50–65 |
| Winter Melon | Mar 7 | Apr 18 | Apr 25 | Jul 25 – Sep 12 | 90–120 |
| Yam | Mar 7 | Apr 18 | Apr 25 | Oct 24 – Feb 20 | 180–330 |
| Yard Long Beans | Mar 7 | Apr 18 | Apr 25 | Jun 20 – Aug 1 | 55–80 |
| Zucchini | Mar 21 | Apr 18 | Apr 25 | Jun 13 – Aug 8 | 45–60 |
🍓 Fruits to Grow in Mariposa County
24 fruits that grow well in Zone 9b with planting dates for Mariposa County.
Show all 24 fruits with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Alpine Strawberries | — | — | May 2 | Aug 1 – Nov 14 | 90–180 |
| Blackberries | — | — | May 2 | — | 365–730 |
| Boysenberries | — | — | May 2 | — | 365–730 |
| Cantaloupe | — | — | May 2 | Jul 11 – Aug 15 | 70–90 |
| Che Fruit | — | — | May 2 | — | 1095–1825 |
| Dragon Fruit | — | — | May 2 | — | 365–730 |
| Elderberries | — | — | May 2 | — | 730–1095 |
| Figs | — | — | May 2 | — | 730–1825 |
| Goji Berries | — | — | May 2 | — | 730–1095 |
| Grapes | — | — | May 2 | — | 730–1095 |
| Ground Cherry | — | — | May 2 | Jul 11 – Sep 5 | 65–80 |
| Guava | — | — | May 2 | — | 365–730 |
| Honeydew | — | — | May 2 | Jul 25 – Sep 5 | 80–110 |
| Kiwi | — | — | May 2 | — | 1095–1825 |
| Loquat | — | — | May 2 | — | 730–1825 |
| Mulberries | — | — | May 2 | — | 730–1825 |
| Passion Fruit | — | — | May 2 | — | 365–545 |
| Pawpaw | — | — | May 2 | — | 1095–2555 |
| Persimmon | — | — | May 2 | — | 1095–2555 |
| Pomegranate | — | — | May 2 | — | 730–1095 |
| Quince | — | — | May 2 | — | 1095–1825 |
| Raspberries | — | — | May 2 | — | 365–730 |
| Serviceberries | — | — | May 2 | — | 730–1095 |
| Strawberries | — | — | May 2 | Aug 1 – Feb 27 | 90–365 |
🌿 Herbs to Grow in Mariposa County
40 herbs that grow well in Zone 9b with planting dates for Mariposa County.
Show all 40 herbs with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Anise | Mar 21 | Mar 28 | Apr 11 | Jul 11 – Sep 26 | 90–120 |
| Basil | Mar 7 | Apr 25 | Apr 25 | Jun 20 – Aug 22 | 50–75 |
| Bee Balm | — | — | Apr 25 | Jul 25 – Oct 10 | 90–120 |
| Borage | Mar 21 | Mar 28 | Apr 11 | Jun 6 – Jul 25 | 50–60 |
| Caraway | Mar 21 | Mar 28 | Apr 11 | — | 365–450 |
| Catnip | — | — | Apr 25 | Jun 27 – Aug 29 | 60–80 |
| Chamomile | Mar 21 | Mar 28 | Apr 11 | Jun 13 – Aug 22 | 60–90 |
| Chervil | Mar 21 | Mar 28 | Apr 11 | May 23 – Jul 25 | 40–60 |
| Chives | — | — | Apr 25 | Jun 27 – Sep 5 | 60–90 |
| Cilantro | Mar 21 | Mar 28 | Apr 11 | May 23 – Jul 25 | 40–60 |
| Comfrey | — | — | Apr 25 | Jun 27 – Sep 5 | 60–90 |
| Cumin | Mar 21 | Mar 28 | Apr 11 | Jul 25 – Sep 26 | 100–120 |
| Dill | Mar 21 | Mar 28 | Apr 11 | May 23 – Jul 25 | 40–60 |
| Echinacea | — | — | Apr 25 | Aug 29 – Dec 5 | 120–180 |
| Epazote | Mar 7 | Apr 25 | Apr 25 | Jun 13 – Aug 8 | 45–60 |
| Fennel (herb) | Mar 21 | Mar 28 | Apr 11 | Jun 13 – Aug 22 | 60–90 |
| Feverfew | — | — | Apr 25 | Jul 25 – Oct 10 | 90–120 |
| Garlic Chives | — | — | Apr 25 | Jun 27 – Sep 5 | 60–90 |
| Horehound | — | — | Apr 25 | Jul 11 – Sep 5 | 75–90 |
| Hyssop | — | — | Apr 25 | Jul 4 – Sep 5 | 70–90 |
| Lavender | — | — | Apr 25 | Jul 25 – Dec 26 | 90–200 |
| Lemon Balm | — | — | Apr 25 | Jun 27 – Aug 15 | 60–70 |
| Lemon Thyme | — | — | Apr 25 | Jul 4 – Sep 5 | 70–90 |
| Lemon Verbena | Mar 7 | Apr 25 | Apr 25 | Jun 27 – Sep 5 | 60–90 |
| Lemongrass | Mar 7 | Apr 25 | Apr 25 | Jul 11 – Oct 10 | 75–120 |
| Marjoram | — | — | Apr 25 | Jun 27 – Sep 5 | 60–90 |
| Mint | — | — | Apr 25 | Jun 27 – Sep 5 | 60–90 |
| Oregano | — | — | Apr 25 | Jun 27 – Sep 5 | 60–90 |
| Parsley | Mar 21 | Mar 28 | Apr 11 | Jun 13 – Aug 15 | 60–80 |
| Rosemary | — | — | Apr 25 | Jul 18 – Dec 5 | 80–180 |
| Rue | — | — | Apr 25 | Jul 4 – Sep 5 | 70–90 |
| Sage | — | — | Apr 25 | Jul 11 – Sep 5 | 75–90 |
| Savory | — | — | Apr 25 | Jun 20 – Aug 15 | 50–70 |
| Sorrel | Mar 21 | Mar 28 | Apr 11 | May 23 – Jul 25 | 40–60 |
| Stevia | Mar 7 | Apr 25 | Apr 25 | Jun 27 – Sep 5 | 60–90 |
| Tarragon | — | — | Apr 25 | Jun 27 – Sep 5 | 60–90 |
| Thai Basil | Mar 7 | Apr 25 | Apr 25 | Jun 20 – Aug 22 | 50–75 |
| Thyme | — | — | Apr 25 | Jul 4 – Sep 5 | 70–90 |
| Valerian | — | — | Apr 25 | Aug 29 – Dec 5 | 120–180 |
| Yarrow | — | — | Apr 25 | Jul 25 – Oct 10 | 90–120 |
Monthly Planting Guide for Mariposa County
Gardening Guides & Resources
Helpful guides from The Ultimate Homestead to improve your garden in Mariposa County.
Frequently Asked Questions
What planting zone is Mariposa County, CA?
Mariposa County is in USDA Hardiness Zone 9b. 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 Mariposa County, CA?
Based on 28 years of NOAA weather station data, the median last spring frost in Mariposa County falls around April 18. In 8 out of 10 years, last frost lands between February 15 and May 18 — a 93-day window of variability. Use May 18 as your conservative safe-to-plant date for frost-sensitive crops.
When is the first fall frost in Mariposa County, CA?
The median first fall frost in Mariposa County arrives around November 9. In cold years it can arrive as early as October 11; in mild years as late as December 3. Harvest or protect frost-sensitive crops — tomatoes, peppers, basil, squash — before this date.
How long is the growing season in Mariposa County?
Mariposa County has a frost-free growing season of approximately 205 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 longer by about 5.58 days per decade.
What is the soil like in Mariposa County for gardening?
Mariposa County has predominantly Loam soil with a pH range of 6.5–7.5 and Well Drained drainage. Most vegetables and herbs grow well with standard composting and seasonal soil amendment.
What is grown commercially in Mariposa County?
Mariposa County has commercial agriculture that includes Almonds, Grapes, Dairy, Lettuce, Tomatoes. These crops reflect the local climate and soil conditions — what succeeds commercially often translates well to home gardens in the same area.
Is Mariposa County a good location for home gardening?
Mariposa County scores 45/100 (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.
Your Mariposa County Garden Planner — Free
A 24-page printable planner built for Mariposa County (Zone 9b). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.
The Gardener's Encyclopedia to Companion Planting
The pairings that make vegetables, herbs, and flowers grow better — and the ones that quietly wreck a bed.
- Proven pairings for 200+ vegetables, herbs, flowers, and fruits
- Full seed-starting + planting schedule with timing and spacing
- Bonus: square-foot gardening guide + printable seasonal planners
Seed Saving & Storage Guide
Most saved seeds go bad before next season. This shows exactly when to pick, how to dry, and where to store seeds from 200 plants so yours don't.
- 200 plants, step-by-step: life cycle, pollination type, isolation
- Exact temperature + humidity ranges that keep seeds viable
- Bonus: searchable Google Sheets tracker + custom GPT assistant
Composting Guide for Homesteaders
Turn kitchen scraps and yard waste into compost that actually feeds the garden — instead of a pile that smells, attracts pests, and never breaks down.
- 14 sections on composting methods, soil science, and troubleshooting
- The 7-step hot-compost system from start to finish
- Bonus tools: troubleshooting chart, safety guide, monitoring log