Siskiyou County, CA — Planting Guide
Top priorities for Siskiyou County, California gardeners in May
Your Siskiyou County, California garden is entering a new phase. Here's what's on the schedule for May and why each task matters now.
-
Plant out basil, cucumber, and kale
Your last frost (May 15) has passed. These warm-season crops can handle outdoor soil now.
-
Plant basil, carrots, and cucumber from seed, right in the garden
Succession planting is the secret here. Put in a row now, another in 2 weeks, a third in 4.
-
It's harvest week for radish, cress, and microgreens
Don't tug. Use scissors or pruners for clean cuts — torn stems invite disease.
Get ahead of June
- Transplants going out: alpine strawberries, aronia, and blackberries
- Starting indoors: cucumber, kale, and lettuce
- First harvests: lettuce, radish, and arugula
Siskiyou County is in USDA Zone 8a. The average last spring frost is May 15 and the first fall frost is October 1, giving you a growing season of approximately 139 days.
At an elevation of 251 ft, Siskiyou County receives approximately 36 in of rainfall annually. Summer highs average 84°F with winter lows around 38°F. The predominant soil type is Sandy Loam.
Based on 31 years of NOAA climate station data, the last frost date here varies by 55 days year to year — ranging from April 23 in warm years to June 18 in cold years. The growing season is trending longer by about 6.36 days per decade. Siskiyou County scores 62/100 (Good) on the Microclimate Index.
🌡️ Zone
8a (°F to °F min)
❄️ Last Frost
May 15
🍂 First Frost
October 1
📅 Growing Season
139 days
⛰️ Elevation
251 ft
🌧️ Annual Rainfall
36 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 | 7.3 in | 9 days | — | None |
| Feb | 7.1 in | 9 days | — | None |
| Mar | 5.3 in | 9 days | — | Low |
| Apr | 3.3 in | 4 days | 1 in | Moderate |
| May | 1 in | 1 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 | 0 days | 3.9 in | Critical |
| Oct | 1.6 in | 3 days | 2.7 in | High |
| Nov | 3.1 in | 6 days | — | None |
| Dec | 6.7 in | 8 days | — | None |
Annual total: 36 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.
Siskiyou County Soil Profile
Soil Type
Sandy Loam
Soil pH
6-6.9
Drainage
Well Drained
Frost Risk Probability
Based on 31 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) | Jun 18 | Oct 24 | 128 days |
| Cautious | May 31 | Oct 11 | 133 days |
| Average year | May 15 | Oct 1 | 139 days |
| Optimistic | May 6 | Sep 21 | 138 days |
| Aggressive (risky) | Apr 23 | Aug 31 | 130 days |
Not very — frost dates can vary by ±55 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 6.4 days per decade). Spring is arriving earlier than it used to. Good news for gardeners.
Gardening Difficulty Score
Siskiyou County offers good growing conditions. A little planning around frost dates goes a long way.
Local Gardening Help in Siskiyou 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 Siskiyou County's climate and soil.
County Extension Office
Siskiyou 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 Siskiyou County
Finding local nurseries & garden centers in Siskiyou County
Why Buy Local
Local nurseries carry plants that are proven to grow in your area. Staff can give you advice specific to Siskiyou 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 Siskiyou County CA" or "garden center Siskiyou 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 Siskiyou County CA" or check your extension office and local parks department. Facebook groups like "Siskiyou 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
15 hours
Summer solstice daylight
Shortest Day
9 hours
Winter solstice daylight
Peak Sun Hours
14 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 | 9.3 hr | 5.4 hr | Short day |
| February | 10.4 hr | 6.2 hr | Short day |
| March | 11.7 hr | 7.4 hr | Short day |
| April | 13.1 hr | 9.4 hr | Neutral |
| May | 14.3 hr | 11.1 hr | Long day |
| June | 15 hr | 13.8 hr | Long day |
| July | 14.7 hr | 14 hr | Long day |
| August | 13.7 hr | 12.3 hr | Neutral |
| September | 12.3 hr | 10.4 hr | Neutral |
| October | 10.8 hr | 8 hr | Short day |
| November | 9.6 hr | 6.2 hr | Short day |
| December | 9 hr | 5 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 | 37°F | 44°F | ❄️ Dormant | ~36 weeks |
| Feb | 37°F | 44°F | ❄️ Dormant | ~36 weeks |
| Mar | 44°F | 49°F | 🐢 Slow | ~24 weeks |
| Apr | 58°F | 56°F | ♻️ Active | ~14 weeks |
| May | 67°F | 64°F | 🔥 Peak | ~8 weeks |
| Jun | 79°F | 73°F | 🔥 Peak | ~8 weeks |
| Jul | 83°F | 81°F | 🔥 Peak | ~8 weeks |
| Aug | 84°F | 81°F | 🔥 Peak | ~8 weeks |
| Sep | 82°F | 78°F | 🔥 Peak | ~8 weeks |
| Oct | 69°F | 71°F | 🔥 Peak | ~8 weeks |
| Nov | 53°F | 60°F | ♻️ Active | ~14 weeks |
| Dec | 44°F | 50°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 Siskiyou 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
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 | Moderate | Mar, Apr, May, Jun, Jul, Aug, Sep, Oct |
| Japanese beetles | Moderate | Jun, Jul, Aug |
| Squash vine borers | Moderate | 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
- Watch for powdery mildew, downy mildew, blight — common in your climate
Cover Crops for Siskiyou 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 | May 19 | Jul 23 | — | Rapid growth, attracts pollinators, suppresses weeds |
| Cowpeas (southern peas) | May 19 | Jul 30 | ✓ Yes | Excellent nitrogen fixer for warm climates, edible |
| Sorghum-sudan grass | May 24 | Aug 6 | — | Massive biomass, breaks compaction, suppresses nematodes |
| White clover | Apr 17 | Jul 23 | ✓ 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 26 | Sep 10 | — | 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 6 | May 1 | ✓ Yes | Fixes nitrogen, good for heavy clay soils |
| Crimson clover | Jul 23 | Apr 24 | ✓ Yes | Fixes nitrogen, attracts pollinators in spring |
| Daikon radish | Aug 10 | May 1 | — | Deep taproot breaks compaction, excellent for clay soils |
| Hairy vetch | Jul 25 | Apr 24 | ✓ Yes | Excellent nitrogen fixer, good for depleted soils |
| Oats | Aug 31 | May 1 | — | Quick biomass, winterkills in cold zones — no spring tillage needed |
| Winter rye | Jun 23 | Apr 24 | — | Suppresses weeds, prevents erosion, breaks up compacted soil |
| Winter wheat | Jul 5 | Apr 24 | — | 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: 12 mph Summer: 11 mph
Fall: 7 mph Winter: 10 mph
Prevailing wind: W. Moderate wind — consider a temporary windbreak for young seedlings.
Windbreak Benefit
4.7/10
Moderately beneficial — a simple fence or trellis can protect delicate crops from wind stress.
Frost Pocket Risk
Moderate
Some terrain variation (965 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
17,942 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 36.0 inches of rain per year
- A 1,000 sq ft roof can collect roughly 17,942 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 Siskiyou County
Soil Type
Sandy Loam
Soil pH 6–6.9 · Moderately Well Drained drainage
Good candidate for raised beds to maximise drainage and extend the season.
Watering Needs
Drought stress: 1.5/10
Siskiyou County has very low drought pressure. Natural rainfall usually meets garden needs — water only during extended dry spells.
Season Tips
139-day frost-free season
Start warm-season crops indoors and focus on short-season varieties. Cold frames extend your season by 3–4 weeks in fall.
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
Retain moisture and nutrients in sandy soils with expanded vermiculite.
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 Siskiyou County
115 vegetables that grow well in Zone 8a with planting dates for Siskiyou County.
Show all 115 vegetables with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Acorn Squash | Apr 17 | May 22 | May 29 | Aug 21 – Sep 25 | 80–100 |
| Amaranth | Mar 27 | May 22 | May 29 | Aug 28 – Oct 16 | 90–120 |
| Artichoke | — | — | May 29 | Oct 2 – Dec 11 | 120–180 |
| Arugula | Apr 10 | May 1 | May 15 | Jun 19 – Aug 21 | 30–50 |
| Asparagus | — | — | May 29 | — | 730–1095 |
| Beets | — | May 1 | — | Jun 26 – Jul 24 | 50–70 |
| Belgian Endive | Apr 10 | May 1 | May 15 | Sep 4 – Oct 30 | 110–150 |
| Bitter Melon | Mar 27 | May 22 | May 29 | Jul 31 – Sep 11 | 60–90 |
| Black Beans | — | May 22 | — | Aug 21 – Oct 9 | 90–120 |
| Bok Choy | Apr 10 | May 1 | May 15 | Jun 26 – Jul 31 | 40–60 |
| Broccoli | Apr 10 | May 1 | May 15 | Jul 17 – Aug 28 | 60–90 |
| Broccoli Rabe | Apr 10 | May 1 | May 15 | Jun 26 – Jul 31 | 40–60 |
| Brussels Sprouts | Apr 10 | May 1 | May 15 | Aug 14 – Oct 9 | 90–130 |
| Butternut Squash | Apr 17 | May 22 | May 29 | Aug 28 – Oct 2 | 85–110 |
| Cabbage | Apr 10 | May 1 | May 15 | Jul 17 – Sep 11 | 60–100 |
| Calabash | Mar 27 | May 22 | May 29 | Aug 21 – Oct 16 | 80–120 |
| Cardoon | — | — | May 29 | Oct 2 – Nov 13 | 120–150 |
| Carrots | — | May 1 | — | Jul 3 – Aug 7 | 60–80 |
| Cauliflower | Apr 10 | May 1 | May 15 | Jul 10 – Sep 11 | 55–100 |
| Celeriac | Apr 10 | May 1 | May 15 | Aug 28 – Oct 2 | 100–120 |
| Celery | Apr 10 | May 1 | May 15 | Aug 7 – Oct 2 | 80–120 |
| Celtuce | Apr 10 | May 1 | May 15 | Jul 17 – Aug 28 | 60–90 |
| Chard | Apr 10 | May 1 | May 15 | Jul 10 – Aug 28 | 50–60 |
| Chayote | Mar 27 | May 22 | May 29 | Oct 2 – Dec 11 | 120–180 |
| Chickpeas | Apr 10 | May 1 | May 15 | Aug 7 – Sep 18 | 80–110 |
| Chicory | Apr 10 | May 1 | May 15 | Jul 17 – Aug 28 | 60–85 |
| Chinese Cabbage | Apr 10 | May 1 | May 15 | Jul 10 – Aug 7 | 50–70 |
| Christmas Lima Beans | Mar 27 | May 22 | May 29 | Aug 21 – Sep 25 | 80–100 |
| Collard Greens | Apr 10 | May 1 | May 15 | Jul 10 – Sep 11 | 55–75 |
| Corn | — | May 22 | — | Jul 24 – Sep 18 | 60–100 |
| Cowpeas | — | May 22 | — | Jul 24 – Sep 4 | 60–90 |
| Cress | Apr 10 | May 1 | May 15 | May 29 – Jun 19 | 14–21 |
| Crookneck Squash | Apr 17 | May 22 | May 29 | Jul 17 – Aug 14 | 45–60 |
| Crosne | — | May 1 | — | Oct 2 – Dec 4 | 150–200 |
| Cucumber | Apr 17 | May 22 | May 29 | Jul 24 – Sep 18 | 50–70 |
| Daikon | — | May 1 | — | Jun 26 – Jul 24 | 50–70 |
| Delicata Squash | Apr 17 | May 22 | May 29 | Aug 21 – Sep 25 | 80–100 |
| Edamame | — | May 22 | — | Aug 7 – Sep 18 | 75–100 |
| Eggplant | Mar 13 | May 22 | May 29 | Aug 7 – Oct 9 | 65–85 |
| Endive | Apr 10 | May 1 | May 15 | Jul 3 – Aug 7 | 45–65 |
| Escarole | Apr 10 | May 1 | May 15 | Jul 10 – Aug 7 | 50–70 |
| Fava Beans | Apr 10 | May 1 | May 15 | Jul 31 – Sep 11 | 75–100 |
| Fennel | Mar 27 | May 22 | May 29 | Jul 31 – Sep 11 | 60–90 |
| Garlic | — | — | — | — | 90–240 |
| Ginger | Mar 27 | May 22 | May 29 | Jan 29 – Feb 12 | 240–300 |
| Green Beans | — | May 22 | — | Jul 17 – Sep 11 | 50–65 |
| Horseradish | — | — | May 29 | Oct 2 – Dec 11 | 120–180 |
| Hot Peppers | Mar 13 | May 22 | May 29 | Aug 7 – Nov 13 | 70–120 |
| Hubbard Squash | Apr 17 | May 22 | May 29 | Sep 11 – Oct 16 | 100–120 |
| Jicama | Mar 27 | May 22 | May 29 | Oct 2 – Dec 11 | 120–180 |
| Kabocha | Apr 17 | May 22 | May 29 | Aug 28 – Sep 25 | 85–100 |
| Kai Lan | Apr 10 | May 1 | May 15 | Jul 3 – Jul 31 | 45–60 |
| Kale | Apr 10 | May 1 | May 15 | Jul 10 – Sep 4 | 50–70 |
| Kidney Beans | — | May 22 | — | Aug 21 – Sep 25 | 85–110 |
| Kohlrabi | Apr 10 | May 1 | May 15 | Jul 3 – Aug 7 | 45–65 |
| Komatsuna | Apr 10 | May 1 | May 15 | Jun 19 – Jul 24 | 35–50 |
| Leeks | Apr 10 | May 1 | May 15 | Aug 14 – Oct 30 | 90–150 |
| Lentils | Apr 10 | May 1 | May 15 | Aug 7 – Sep 18 | 80–110 |
| Lettuce | Apr 10 | May 1 | May 15 | Jun 19 – Aug 28 | 30–60 |
| Lima Beans | — | May 22 | — | Jul 24 – Sep 4 | 60–90 |
| Loofah | Mar 27 | May 22 | May 29 | Sep 11 – Nov 13 | 100–150 |
| Luffa | Mar 27 | May 22 | May 29 | Aug 28 – Nov 13 | 90–150 |
| Mache | Apr 10 | May 1 | May 15 | Jun 26 – Jul 31 | 40–60 |
| Malabar Spinach | Mar 27 | May 22 | May 29 | Jul 24 – Aug 21 | 55–70 |
| Melon | Apr 17 | May 22 | May 29 | Aug 7 – Sep 25 | 70–100 |
| Microgreens | Apr 10 | May 1 | May 15 | May 22 – Jun 19 | 7–21 |
| Mitsuba | Apr 10 | May 1 | May 8 | Jul 3 – Aug 28 | 50–70 |
| Mizuna | Apr 10 | May 1 | May 15 | Jun 19 – Jul 17 | 30–45 |
| Mustard Greens | Apr 10 | May 1 | May 15 | Jun 19 – Aug 21 | 30–50 |
| Napa Cabbage | Apr 10 | May 1 | May 15 | Jul 10 – Aug 14 | 55–75 |
| New Zealand Spinach | Mar 27 | May 22 | May 29 | Jul 24 – Aug 21 | 55–70 |
| Okra | Mar 27 | May 22 | May 29 | Jul 24 – Sep 18 | 50–65 |
| Onion | Apr 10 | May 1 | May 15 | Aug 14 – Oct 2 | 90–120 |
| Pac Choi | Apr 10 | May 1 | May 15 | Jun 26 – Jul 24 | 40–55 |
| Parsnip | — | May 1 | — | Aug 14 – Sep 25 | 100–130 |
| Patty Pan Squash | Apr 17 | May 22 | May 29 | Jul 17 – Aug 14 | 45–60 |
| Peas | Apr 10 | May 1 | May 15 | Jul 10 – Sep 4 | 55–70 |
| Peppers | Mar 13 | May 22 | May 29 | Jul 31 – Oct 9 | 60–90 |
| Pole Beans | Mar 27 | May 22 | May 29 | Jul 24 – Sep 18 | 55–70 |
| Potatoes | Mar 27 | May 22 | May 29 | Aug 7 – Oct 16 | 70–120 |
| Pumpkin | Apr 17 | May 22 | May 29 | Aug 28 – Oct 16 | 85–120 |
| Purslane | Apr 10 | May 1 | May 15 | Jun 26 – Jul 31 | 40–60 |
| Radicchio | Apr 10 | May 1 | May 15 | Jul 17 – Aug 21 | 60–80 |
| Radish | — | May 1 | — | May 29 – Jun 19 | 22–35 |
| Rhubarb | — | — | Jun 5 | — | 365–730 |
| Romanesco | Apr 10 | May 1 | May 15 | Jul 31 – Sep 11 | 75–100 |
| Rutabaga | — | May 1 | — | Jul 24 – Aug 28 | 80–100 |
| Salsify | — | May 1 | — | Aug 14 – Sep 25 | 100–130 |
| Savoy Cabbage | Apr 10 | May 1 | May 15 | Jul 24 – Sep 18 | 70–110 |
| Scallions | Apr 10 | May 1 | May 15 | Jul 10 – Aug 7 | 50–70 |
| Scarlet Runner Beans | Mar 27 | May 22 | May 29 | Jul 31 – Sep 4 | 60–80 |
| Shallot | Apr 10 | May 1 | May 15 | Aug 14 – Oct 2 | 90–120 |
| Shiso | Mar 27 | May 22 | May 29 | Jul 24 – Sep 18 | 50–70 |
| Snap Peas | Mar 27 | May 22 | May 29 | Jul 24 – Sep 18 | 55–70 |
| Snow Peas | Apr 10 | May 1 | May 15 | Jul 10 – Sep 4 | 50–65 |
| Soybeans | — | May 22 | — | Aug 14 – Oct 9 | 80–120 |
| Spaghetti Squash | Apr 17 | May 22 | May 29 | Aug 28 – Sep 25 | 85–100 |
| Spinach | Apr 10 | May 1 | May 15 | Jun 19 – Aug 21 | 35–50 |
| Squash (Summer) | Apr 17 | May 22 | May 29 | Jul 17 – Sep 18 | 45–65 |
| Squash (Winter) | Apr 17 | May 22 | May 29 | Aug 21 – Oct 16 | 80–120 |
| Sunchoke | — | — | May 29 | Sep 18 – Nov 13 | 110–150 |
| Sunflower | Mar 27 | May 22 | May 29 | Aug 7 – Sep 25 | 70–100 |
| Sweet Corn | — | May 22 | — | Jul 24 – Sep 4 | 60–90 |
| Sweet Potatoes | Mar 27 | May 22 | May 29 | Aug 28 – Oct 16 | 90–120 |
| Tatsoi | Apr 10 | May 1 | May 15 | Jun 19 – Jul 24 | 35–50 |
| Tomatillo | Mar 27 | May 22 | May 29 | Jul 31 – Oct 9 | 60–85 |
| Tomatoes | Mar 27 | May 22 | May 29 | Jul 31 – Oct 9 | 60–85 |
| Turmeric | Mar 27 | May 22 | May 29 | Jan 29 – Feb 12 | 240–300 |
| Turnip | — | May 1 | — | Jun 12 – Jul 17 | 40–60 |
| Watercress | Apr 10 | May 1 | May 15 | Jun 26 – Jul 31 | 40–60 |
| Watermelon | Apr 17 | May 22 | May 29 | Aug 7 – Sep 25 | 70–100 |
| Wax Beans | — | May 22 | — | Jul 17 – Sep 11 | 50–65 |
| Winter Melon | Mar 27 | May 22 | May 29 | Aug 28 – Oct 16 | 90–120 |
| Yard Long Beans | Mar 27 | May 22 | May 29 | Jul 24 – Sep 4 | 55–80 |
| Zucchini | Apr 17 | May 22 | May 29 | Jul 17 – Sep 11 | 45–60 |
🍓 Fruits to Grow in Siskiyou County
27 fruits that grow well in Zone 8a with planting dates for Siskiyou County.
Show all 27 fruits with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Alpine Strawberries | — | — | Jun 5 | Sep 4 – Dec 18 | 90–180 |
| Aronia | — | — | Jun 5 | — | 730–1095 |
| Blackberries | — | — | Jun 5 | — | 365–730 |
| Blueberries | — | — | Jun 5 | — | 730–1095 |
| Boysenberries | — | — | Jun 5 | — | 365–730 |
| Cantaloupe | — | — | Jun 5 | Aug 14 – Sep 18 | 70–90 |
| Che Fruit | — | — | Jun 5 | — | 1095–1825 |
| Elderberries | — | — | Jun 5 | — | 730–1095 |
| Figs | — | — | Jun 5 | — | 730–1825 |
| Goji Berries | — | — | Jun 5 | — | 730–1095 |
| Gooseberries | — | — | Jun 5 | — | 730–1095 |
| Grapes | — | — | Jun 5 | — | 730–1095 |
| Ground Cherry | — | — | Jun 5 | Aug 14 – Oct 9 | 65–80 |
| Hardy Kiwi | — | — | Jun 5 | — | 1095–1825 |
| Honeydew | — | — | Jun 5 | Aug 28 – Oct 9 | 80–110 |
| Jostaberry | — | — | Jun 5 | — | 730–1095 |
| Kiwi | — | — | Jun 5 | — | 1095–1825 |
| Loquat | — | — | Jun 5 | — | 730–1825 |
| Medlar | — | — | Jun 5 | — | 1095–1825 |
| Mulberries | — | — | Jun 5 | — | 730–1825 |
| Pawpaw | — | — | Jun 5 | — | 1095–2555 |
| Persimmon | — | — | Jun 5 | — | 1095–2555 |
| Pomegranate | — | — | Jun 5 | — | 730–1095 |
| Quince | — | — | Jun 5 | — | 1095–1825 |
| Raspberries | — | — | Jun 5 | — | 365–730 |
| Serviceberries | — | — | Jun 5 | — | 730–1095 |
| Strawberries | — | — | Jun 5 | Sep 4 – Feb 19 | 90–365 |
🌿 Herbs to Grow in Siskiyou County
42 herbs that grow well in Zone 8a with planting dates for Siskiyou County.
Show all 42 herbs with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Angelica | Apr 10 | May 1 | May 8 | — | 365–730 |
| Anise | Apr 10 | May 1 | May 8 | Aug 7 – Oct 23 | 90–120 |
| Basil | Mar 27 | May 22 | May 29 | Jul 24 – Sep 25 | 50–75 |
| Bee Balm | — | — | May 22 | Aug 21 – Nov 6 | 90–120 |
| Borage | Apr 10 | May 1 | May 8 | Jul 3 – Aug 21 | 50–60 |
| Caraway | Apr 10 | May 1 | May 8 | — | 365–450 |
| Catnip | — | — | May 22 | Jul 24 – Sep 25 | 60–80 |
| Chamomile | Apr 10 | May 1 | May 8 | Jul 10 – Sep 18 | 60–90 |
| Chervil | Apr 10 | May 1 | May 8 | Jun 19 – Aug 21 | 40–60 |
| Chives | — | — | May 22 | Jul 24 – Oct 2 | 60–90 |
| Cilantro | Apr 10 | May 1 | May 8 | Jun 19 – Aug 21 | 40–60 |
| Comfrey | — | — | May 22 | Jul 24 – Oct 2 | 60–90 |
| Cumin | Apr 10 | May 1 | May 8 | Aug 21 – Oct 23 | 100–120 |
| Dill | Apr 10 | May 1 | May 8 | Jun 19 – Aug 21 | 40–60 |
| Echinacea | — | — | May 22 | Sep 25 – Jan 1 | 120–180 |
| Epazote | Mar 27 | May 22 | May 29 | Jul 17 – Sep 11 | 45–60 |
| Fennel (herb) | Apr 10 | May 1 | May 8 | Jul 10 – Sep 18 | 60–90 |
| Feverfew | — | — | May 22 | Aug 21 – Nov 6 | 90–120 |
| Garlic Chives | — | — | May 22 | Jul 24 – Oct 2 | 60–90 |
| Horehound | — | — | May 22 | Aug 7 – Oct 2 | 75–90 |
| Hyssop | — | — | May 22 | Jul 31 – Oct 2 | 70–90 |
| Lavender | — | — | May 22 | Aug 21 – Jan 22 | 90–200 |
| Lemon Balm | — | — | May 22 | Jul 24 – Sep 11 | 60–70 |
| Lemon Thyme | — | — | May 22 | Jul 31 – Oct 2 | 70–90 |
| Lemon Verbena | Mar 27 | May 22 | May 29 | Jul 31 – Oct 9 | 60–90 |
| Lemongrass | Mar 27 | May 22 | May 29 | Aug 14 – Nov 13 | 75–120 |
| Lovage | — | — | May 22 | Jul 31 – Oct 2 | 70–90 |
| Marjoram | — | — | May 22 | Jul 24 – Oct 2 | 60–90 |
| Mint | — | — | May 22 | Jul 24 – Oct 2 | 60–90 |
| Oregano | — | — | May 22 | Jul 24 – Oct 2 | 60–90 |
| Parsley | Apr 10 | May 1 | May 8 | Jul 10 – Sep 11 | 60–80 |
| Rosemary | — | — | May 22 | Aug 14 – Jan 1 | 80–180 |
| Rue | — | — | May 22 | Jul 31 – Oct 2 | 70–90 |
| Sage | — | — | May 22 | Aug 7 – Oct 2 | 75–90 |
| Savory | — | — | May 22 | Jul 17 – Sep 11 | 50–70 |
| Sorrel | Apr 10 | May 1 | May 8 | Jun 19 – Aug 21 | 40–60 |
| Stevia | Mar 27 | May 22 | May 29 | Jul 31 – Oct 9 | 60–90 |
| Tarragon | — | — | May 22 | Jul 24 – Oct 2 | 60–90 |
| Thai Basil | Mar 27 | May 22 | May 29 | Jul 24 – Sep 25 | 50–75 |
| Thyme | — | — | May 22 | Jul 31 – Oct 2 | 70–90 |
| Valerian | — | — | May 22 | Sep 25 – Jan 1 | 120–180 |
| Yarrow | — | — | May 22 | Aug 21 – Nov 6 | 90–120 |
Monthly Planting Guide for Siskiyou County
Gardening Guides & Resources
Helpful guides from The Ultimate Homestead to improve your garden in Siskiyou County.
Frequently Asked Questions
What planting zone is Siskiyou County, CA?
Siskiyou County is in USDA Hardiness Zone 8a. 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 Siskiyou County, CA?
Based on 31 years of NOAA weather station data, the median last spring frost in Siskiyou County falls around May 15. In 8 out of 10 years, last frost lands between April 23 and June 18 — a 55-day window of variability. Use June 18 as your conservative safe-to-plant date for frost-sensitive crops.
When is the first fall frost in Siskiyou County, CA?
The median first fall frost in Siskiyou County arrives around October 1. In cold years it can arrive as early as August 31; in mild years as late as October 24. Harvest or protect frost-sensitive crops — tomatoes, peppers, basil, squash — before this date.
How long is the growing season in Siskiyou County?
Siskiyou County has a frost-free growing season of approximately 139 days. Focus on short-season varieties and start warm-season crops indoors 6–8 weeks before last frost. Climate records show the growing season is trending longer by about 6.36 days per decade.
What is the soil like in Siskiyou County for gardening?
Siskiyou County has predominantly Sandy Loam soil with a pH range of 6–6.9 and Moderately Well Drained drainage. Most vegetables and herbs grow well with standard composting and seasonal soil amendment.
What is grown commercially in Siskiyou County?
Siskiyou County has commercial agriculture that includes Almonds, Grapes, Hay, Cattle. These crops reflect the local climate and soil conditions — what succeeds commercially often translates well to home gardens in the same area.
Is Siskiyou County a good location for home gardening?
Siskiyou County scores 62/100 (Good) 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.
Your Siskiyou County Garden Planner — Free
A 24-page printable planner built for Siskiyou County (Zone 8a). 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