Douglas County, WA — Planting Guide
Douglas County is in USDA Zone 6b. The average last spring frost is May 8 and the first fall frost is October 4, giving you a growing season of approximately 149 days.
At an elevation of 2,920 ft, Douglas County receives approximately 15.8 in of rainfall annually. Summer highs average 90°F with winter lows around 25°F. The predominant soil type is Silt Loam.
Based on 31 years of NOAA climate station data, the last frost date here varies by 77 days year to year — ranging from March 24 in warm years to June 10 in cold years. The growing season is trending shorter by about 5.39 days per decade. Douglas County scores 42/100 (Moderate) on the Microclimate Index.
🌡️ Zone
6b (-5°F to 0°F min)
❄️ Last Frost
May 8
🍂 First Frost
October 4
📅 Growing Season
149 days
⛰️ Elevation
2,920 ft
🌧️ Annual Rainfall
15.8 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 | 2.2 in | 15 days | — | None |
| Feb | 1.8 in | 16 days | — | None |
| Mar | 1.5 in | 16 days | 2.8 in | High |
| Apr | 1.2 in | 13 days | 3.1 in | Critical |
| May | 0.8 in | 9 days | 3.5 in | Critical |
| Jun | 0.6 in | 6 days | 3.7 in | Critical |
| Jul | 0.2 in | 3 days | 4.1 in | Critical |
| Aug | 0.3 in | 3 days | 4 in | Critical |
| Sep | 0.7 in | 4 days | 3.6 in | Critical |
| Oct | 1.2 in | 12 days | 3.1 in | Critical |
| Nov | 2.5 in | 17 days | — | None |
| Dec | 2.7 in | 19 days | — | None |
Annual total: 15.7 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.
Douglas County Soil Profile
Soil Type
Silt Loam
Soil pH
5.5-6.2
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 10 | Nov 3 | 146 days |
| Cautious | May 19 | Oct 22 | 156 days |
| Average year | May 8 | Oct 4 | 149 days |
| Optimistic | Apr 19 | Sep 26 | 160 days |
| Aggressive (risky) | Mar 24 | Sep 12 | 172 days |
Not very — frost dates can vary by ±77 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 5.4 days per decade). Use the "Conservative" dates and choose fast-maturing varieties.
Gardening Difficulty Score
Douglas County presents some gardening challenges. Choose adapted varieties and plan around frost dates.
Local Gardening Help in Douglas 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 Douglas County's climate and soil.
County Extension Office
Douglas County Washington State University Extension Extension Office
Phone: 509-335-2811
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 Douglas County
Finding local nurseries & garden centers in Douglas County
Why Buy Local
Local nurseries carry plants that are proven to grow in your area. Staff can give you advice specific to Douglas 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 Douglas County WA" or "garden center Douglas 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 Douglas County WA" or check your extension office and local parks department. Facebook groups like "Douglas County Gardeners" or "Washington 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
15.8 hours
Summer solstice daylight
Shortest Day
8.2 hours
Winter solstice daylight
Peak Sun Hours
10.9 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 | 8.6 hr | 2.1 hr | Short day |
| February | 10 hr | 2.9 hr | Short day |
| March | 11.6 hr | 4.1 hr | Short day |
| April | 13.4 hr | 5.8 hr | Neutral |
| May | 14.9 hr | 7.4 hr | Long day |
| June | 15.8 hr | 8.7 hr | Long day |
| July | 15.4 hr | 10.9 hr | Long day |
| August | 14.1 hr | 9.7 hr | Long day |
| September | 12.3 hr | 7 hr | Neutral |
| October | 10.6 hr | 3.9 hr | Short day |
| November | 9 hr | 2.3 hr | Short day |
| December | 8.2 hr | 1.8 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 Jun through Sep.
Best Month to Compost
Jun
Microbial activity peaks when soil is warm.
Active Composting
6 months
Solid season. Piles go dormant in winter.
View detailed monthly data
| Month | Soil 4" Deep | Soil 8" Deep | Compost Activity | Time to Finish |
|---|---|---|---|---|
| Jan | 23°F | 30°F | ❄️ Dormant | ~36 weeks |
| Feb | 24°F | 31°F | ❄️ Dormant | ~36 weeks |
| Mar | 32°F | 34°F | ❄️ Dormant | ~36 weeks |
| Apr | 44°F | 43°F | 🐢 Slow | ~24 weeks |
| May | 55°F | 51°F | ♻️ Active | ~14 weeks |
| Jun | 66°F | 60°F | 🔥 Peak | ~8 weeks |
| Jul | 73°F | 68°F | 🔥 Peak | ~8 weeks |
| Aug | 75°F | 70°F | 🔥 Peak | ~8 weeks |
| Sep | 69°F | 65°F | 🔥 Peak | ~8 weeks |
| Oct | 55°F | 59°F | ♻️ Active | ~14 weeks |
| Nov | 42°F | 47°F | 🐢 Slow | ~24 weeks |
| Dec | 31°F | 38°F | ❄️ Dormant | ~36 weeks |
Highlighted rows = soil 60°F+ (safe for warm-season transplants). Compost finishes fastest during peak activity months.
Pest & Disease Pressure in Douglas 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 | Apr, May, Jun, Jul, Aug, Sep |
| Japanese beetles | High | Jun, Jul, Aug |
| Squash vine borers | Moderate | Jun, Jul |
| Tomato hornworms | Moderate | Jun, Jul, Aug |
| Cucumber beetles | Moderate | May, Jun, Jul |
| Stink bugs | Moderate | Jun, Jul, Aug, Sep |
Organic pest management tips
- Maintain healthy soil with regular compost additions to build natural pest resistance
- Practice crop rotation annually to break pest cycles
- Encourage beneficial insects with flowering herbs like dill, fennel, and yarrow
Cover Crops for Douglas County
Cover crops protect bare soil, fix nitrogen, suppress weeds, and improve soil structure — with county-specific planting dates.
Spring Cover Crops (3 options) — Build soil before the main growing season
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Buckwheat | May 16 | Jul 26 | — | Rapid growth, attracts pollinators, suppresses weeds |
| Sorghum-sudan grass | May 18 | Aug 9 | — | Massive biomass, breaks compaction, suppresses nematodes |
| White clover | Apr 7 | Jul 26 | ✓ 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 31 | Sep 13 | — | 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 10 | Apr 24 | ✓ Yes | Fixes nitrogen, good for heavy clay soils |
| Crimson clover | Aug 2 | Apr 24 | ✓ Yes | Fixes nitrogen, attracts pollinators in spring |
| Daikon radish | Aug 24 | Apr 17 | — | Deep taproot breaks compaction, excellent for clay soils |
| Hairy vetch | Jul 15 | Apr 17 | ✓ Yes | Excellent nitrogen fixer, good for depleted soils |
| Oats | Aug 30 | Apr 24 | — | Quick biomass, winterkills in cold zones — no spring tillage needed |
| Winter rye | Jun 29 | Apr 17 | — | Suppresses weeds, prevents erosion, breaks up compacted soil |
| Winter wheat | Jul 6 | Apr 17 | — | 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: 7 mph
Fall: 9 mph Winter: 12 mph
Prevailing wind: SW. Moderate wind — consider a temporary windbreak for young seedlings.
Windbreak Benefit
5/10
Moderately beneficial — a simple fence or trellis can protect delicate crops from wind stress.
Frost Pocket Risk
Moderate
Some terrain variation (635 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
7,824 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 2,250 gal tank.
Legal Status
Unrestricted
Rainwater harvesting is fully legal in your state with no restrictions.
Best Collection Months
Jan, Feb, Nov, Dec
Highest rainfall months — your barrels will fill up quickly during these months.
Months to Draw From Storage
May, 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 15.7 inches of rain per year
- A 1,000 sq ft roof can collect roughly 7,824 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 Douglas County
Soil Type
Silt Loam
Soil pH 5.5–6.2 · Well Drained drainage
Native soil is well-suited to most vegetables and herbs with regular compost additions.
Watering Needs
Drought stress: 5.5/10
Moderate drought pressure. Drip irrigation and mulching are highly recommended to maintain soil moisture through summer.
Season Tips
149-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.
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
Test your soil pH, nitrogen, phosphorus, and potassium levels before planting.
Get instant, accurate soil pH readings to fine-tune your amendments.
Boost soil fertility and structure with rich, well-aged organic compost.
🥬 Vegetables to Grow in Douglas County
108 vegetables that grow well in Zone 6b with planting dates for Douglas County.
Show all 108 vegetables with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Acorn Squash | Apr 3 | May 15 | May 22 | Aug 14 – Sep 18 | 80–100 |
| Amaranth | Mar 13 | May 15 | May 22 | Aug 21 – Oct 9 | 90–120 |
| Arugula | Apr 3 | Apr 24 | May 8 | Jun 12 – Aug 14 | 30–50 |
| Asparagus | — | — | May 22 | — | 730–1095 |
| Beets | — | Apr 24 | — | Jun 19 – Jul 17 | 50–70 |
| Belgian Endive | Apr 3 | Apr 24 | May 8 | Aug 28 – Oct 23 | 110–150 |
| Bitter Melon | Mar 13 | May 15 | May 22 | Jul 24 – Sep 4 | 60–90 |
| Black Beans | — | May 15 | — | Aug 14 – Oct 2 | 90–120 |
| Bok Choy | Apr 3 | Apr 24 | May 8 | Jun 19 – Jul 24 | 40–60 |
| Broccoli | Apr 3 | Apr 24 | May 8 | Jul 10 – Aug 21 | 60–90 |
| Broccoli Rabe | Apr 3 | Apr 24 | May 8 | Jun 19 – Jul 24 | 40–60 |
| Brussels Sprouts | Apr 3 | Apr 24 | May 8 | Aug 7 – Oct 2 | 90–130 |
| Butternut Squash | Apr 3 | May 15 | May 22 | Aug 21 – Sep 25 | 85–110 |
| Cabbage | Apr 3 | Apr 24 | May 8 | Jul 10 – Sep 4 | 60–100 |
| Calabash | Mar 13 | May 15 | May 22 | Aug 14 – Oct 9 | 80–120 |
| Carrots | — | Apr 24 | — | Jun 26 – Jul 31 | 60–80 |
| Cauliflower | Apr 3 | Apr 24 | May 8 | Jul 3 – Sep 4 | 55–100 |
| Celeriac | Apr 3 | Apr 24 | May 8 | Aug 21 – Sep 25 | 100–120 |
| Celery | Apr 3 | Apr 24 | May 8 | Jul 31 – Sep 25 | 80–120 |
| Celtuce | Apr 3 | Apr 24 | May 8 | Jul 10 – Aug 21 | 60–90 |
| Chard | Apr 3 | Apr 24 | May 8 | Jul 3 – Aug 21 | 50–60 |
| Chickpeas | Apr 3 | Apr 24 | May 8 | Jul 31 – Sep 11 | 80–110 |
| Chicory | Apr 3 | Apr 24 | May 8 | Jul 10 – Aug 21 | 60–85 |
| Chinese Cabbage | Apr 3 | Apr 24 | May 8 | Jul 3 – Jul 31 | 50–70 |
| Christmas Lima Beans | Mar 13 | May 15 | May 22 | Aug 14 – Sep 18 | 80–100 |
| Collard Greens | Apr 3 | Apr 24 | May 8 | Jul 3 – Sep 4 | 55–75 |
| Corn | — | May 15 | — | Jul 17 – Sep 11 | 60–100 |
| Cowpeas | — | May 15 | — | Jul 17 – Aug 28 | 60–90 |
| Cress | Apr 3 | Apr 24 | May 8 | May 22 – Jun 12 | 14–21 |
| Crookneck Squash | Apr 3 | May 15 | May 22 | Jul 10 – Aug 7 | 45–60 |
| Crosne | — | Apr 24 | — | Sep 25 – Nov 6 | 150–200 |
| Cucumber | Apr 3 | May 15 | May 22 | Jul 17 – Sep 11 | 50–70 |
| Daikon | — | Apr 24 | — | Jun 19 – Jul 17 | 50–70 |
| Delicata Squash | Apr 3 | May 15 | May 22 | Aug 14 – Sep 18 | 80–100 |
| Edamame | — | May 15 | — | Jul 31 – Sep 11 | 75–100 |
| Eggplant | Feb 27 | May 15 | May 22 | Jul 31 – Oct 2 | 65–85 |
| Endive | Apr 3 | Apr 24 | May 8 | Jun 26 – Jul 31 | 45–65 |
| Escarole | Apr 3 | Apr 24 | May 8 | Jul 3 – Jul 31 | 50–70 |
| Fava Beans | Apr 3 | Apr 24 | May 8 | Jul 24 – Sep 4 | 75–100 |
| Fennel | Mar 13 | May 15 | May 22 | Jul 24 – Sep 4 | 60–90 |
| Garlic | — | — | — | — | 90–240 |
| Green Beans | — | May 15 | — | Jul 10 – Sep 4 | 50–65 |
| Horseradish | — | — | May 22 | Sep 25 – Dec 4 | 120–180 |
| Hot Peppers | Feb 27 | May 15 | May 22 | Jul 31 – Nov 6 | 70–120 |
| Hubbard Squash | Apr 3 | May 15 | May 22 | Sep 4 – Oct 9 | 100–120 |
| Kabocha | Apr 3 | May 15 | May 22 | Aug 21 – Sep 18 | 85–100 |
| Kai Lan | Apr 3 | Apr 24 | May 8 | Jun 26 – Jul 24 | 45–60 |
| Kale | Apr 3 | Apr 24 | May 8 | Jul 3 – Aug 28 | 50–70 |
| Kidney Beans | — | May 15 | — | Aug 14 – Sep 18 | 85–110 |
| Kohlrabi | Apr 3 | Apr 24 | May 8 | Jun 26 – Jul 31 | 45–65 |
| Komatsuna | Apr 3 | Apr 24 | May 8 | Jun 12 – Jul 17 | 35–50 |
| Leeks | Apr 3 | Apr 24 | May 8 | Aug 7 – Oct 23 | 90–150 |
| Lentils | Apr 3 | Apr 24 | May 8 | Jul 31 – Sep 11 | 80–110 |
| Lettuce | Apr 3 | Apr 24 | May 8 | Jun 12 – Aug 21 | 30–60 |
| Lima Beans | — | May 15 | — | Jul 17 – Aug 28 | 60–90 |
| Loofah | Mar 13 | May 15 | May 22 | Sep 4 – Nov 6 | 100–150 |
| Luffa | Mar 13 | May 15 | May 22 | Aug 21 – Nov 6 | 90–150 |
| Mache | Apr 3 | Apr 24 | May 8 | Jun 19 – Jul 24 | 40–60 |
| Melon | Apr 3 | May 15 | May 22 | Jul 31 – Sep 18 | 70–100 |
| Microgreens | Apr 3 | Apr 24 | May 8 | May 15 – Jun 12 | 7–21 |
| Mitsuba | Apr 3 | Apr 24 | May 1 | Jun 26 – Aug 21 | 50–70 |
| Mizuna | Apr 3 | Apr 24 | May 8 | Jun 12 – Jul 10 | 30–45 |
| Mustard Greens | Apr 3 | Apr 24 | May 8 | Jun 12 – Aug 14 | 30–50 |
| Napa Cabbage | Apr 3 | Apr 24 | May 8 | Jul 3 – Aug 7 | 55–75 |
| New Zealand Spinach | Mar 13 | May 15 | May 22 | Jul 17 – Aug 14 | 55–70 |
| Okra | Mar 13 | May 15 | May 22 | Jul 17 – Sep 11 | 50–65 |
| Onion | Apr 3 | Apr 24 | May 8 | Aug 7 – Sep 25 | 90–120 |
| Pac Choi | Apr 3 | Apr 24 | May 8 | Jun 19 – Jul 17 | 40–55 |
| Parsnip | — | Apr 24 | — | Aug 7 – Sep 18 | 100–130 |
| Patty Pan Squash | Apr 3 | May 15 | May 22 | Jul 10 – Aug 7 | 45–60 |
| Peas | Apr 3 | Apr 24 | May 8 | Jul 3 – Aug 28 | 55–70 |
| Peppers | Feb 27 | May 15 | May 22 | Jul 24 – Oct 2 | 60–90 |
| Pole Beans | Mar 13 | May 15 | May 22 | Jul 17 – Sep 11 | 55–70 |
| Potatoes | Mar 13 | May 15 | May 22 | Jul 31 – Oct 9 | 70–120 |
| Pumpkin | Apr 3 | May 15 | May 22 | Aug 21 – Oct 9 | 85–120 |
| Purslane | Apr 3 | Apr 24 | May 8 | Jun 19 – Jul 24 | 40–60 |
| Radicchio | Apr 3 | Apr 24 | May 8 | Jul 10 – Aug 14 | 60–80 |
| Radish | — | Apr 24 | — | May 22 – Jun 12 | 22–35 |
| Rhubarb | — | — | May 29 | — | 365–730 |
| Romanesco | Apr 3 | Apr 24 | May 8 | Jul 24 – Sep 4 | 75–100 |
| Rutabaga | — | Apr 24 | — | Jul 17 – Aug 21 | 80–100 |
| Salsify | — | Apr 24 | — | Aug 7 – Sep 18 | 100–130 |
| Savoy Cabbage | Apr 3 | Apr 24 | May 8 | Jul 17 – Sep 11 | 70–110 |
| Scallions | Apr 3 | Apr 24 | May 8 | Jul 3 – Jul 31 | 50–70 |
| Scarlet Runner Beans | Mar 13 | May 15 | May 22 | Jul 24 – Aug 28 | 60–80 |
| Shallot | Apr 3 | Apr 24 | May 8 | Aug 7 – Sep 25 | 90–120 |
| Shiso | Mar 20 | May 15 | May 22 | Jul 17 – Sep 11 | 50–70 |
| Snap Peas | Mar 13 | May 15 | May 22 | Jul 17 – Sep 11 | 55–70 |
| Snow Peas | Apr 3 | Apr 24 | May 8 | Jul 3 – Aug 28 | 50–65 |
| Soybeans | — | May 15 | — | Aug 7 – Oct 2 | 80–120 |
| Spaghetti Squash | Apr 3 | May 15 | May 22 | Aug 21 – Sep 18 | 85–100 |
| Spinach | Apr 3 | Apr 24 | May 8 | Jun 12 – Aug 14 | 35–50 |
| Squash (Summer) | Apr 3 | May 15 | May 22 | Jul 10 – Sep 11 | 45–65 |
| Squash (Winter) | Apr 3 | May 15 | May 22 | Aug 14 – Oct 9 | 80–120 |
| Sunchoke | — | — | May 22 | Sep 11 – Nov 6 | 110–150 |
| Sunflower | Mar 13 | May 15 | May 22 | Jul 31 – Sep 18 | 70–100 |
| Sweet Corn | — | May 15 | — | Jul 17 – Aug 28 | 60–90 |
| Sweet Potatoes | Mar 13 | May 15 | May 22 | Aug 21 – Oct 9 | 90–120 |
| Tatsoi | Apr 3 | Apr 24 | May 8 | Jun 12 – Jul 17 | 35–50 |
| Tomatillo | Mar 13 | May 15 | May 22 | Jul 24 – Oct 2 | 60–85 |
| Tomatoes | Mar 13 | May 15 | May 22 | Jul 24 – Oct 2 | 60–85 |
| Turnip | — | Apr 24 | — | Jun 5 – Jul 10 | 40–60 |
| Watercress | Apr 3 | Apr 24 | May 8 | Jun 19 – Jul 24 | 40–60 |
| Watermelon | Apr 3 | May 15 | May 22 | Jul 31 – Sep 18 | 70–100 |
| Wax Beans | — | May 15 | — | Jul 10 – Sep 4 | 50–65 |
| Winter Melon | Mar 13 | May 15 | May 22 | Aug 21 – Oct 9 | 90–120 |
| Yard Long Beans | Mar 13 | May 15 | May 22 | Jul 17 – Aug 28 | 55–80 |
| Zucchini | Apr 3 | May 15 | May 22 | Jul 10 – Sep 4 | 45–60 |
🍓 Fruits to Grow in Douglas County
27 fruits that grow well in Zone 6b with planting dates for Douglas County.
Show all 27 fruits with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Alpine Strawberries | — | — | May 29 | Aug 28 – Dec 11 | 90–180 |
| Aronia | — | — | May 29 | — | 730–1095 |
| Blackberries | — | — | May 29 | — | 365–730 |
| Blueberries | — | — | May 29 | — | 730–1095 |
| Boysenberries | — | — | May 29 | — | 365–730 |
| Cantaloupe | — | — | May 29 | Aug 7 – Sep 11 | 70–90 |
| Che Fruit | — | — | May 29 | — | 1095–1825 |
| Cranberries | — | — | May 29 | — | 730–1095 |
| Currants | — | — | May 29 | — | 730–1095 |
| Elderberries | — | — | May 29 | — | 730–1095 |
| Goji Berries | — | — | May 29 | — | 730–1095 |
| Gooseberries | — | — | May 29 | — | 730–1095 |
| Grapes | — | — | May 29 | — | 730–1095 |
| Ground Cherry | — | — | May 29 | Aug 7 – Oct 2 | 65–80 |
| Hardy Kiwi | — | — | May 29 | — | 1095–1825 |
| Haskaps | — | — | May 29 | — | 730–1095 |
| Honeydew | — | — | May 29 | Aug 21 – Oct 2 | 80–110 |
| Jostaberry | — | — | May 29 | — | 730–1095 |
| Lingonberries | — | — | May 29 | — | 730–1095 |
| Medlar | — | — | May 29 | — | 1095–1825 |
| Mulberries | — | — | May 29 | — | 730–1825 |
| Pawpaw | — | — | May 29 | — | 1095–2555 |
| Persimmon | — | — | May 29 | — | 1095–2555 |
| Quince | — | — | May 29 | — | 1095–1825 |
| Raspberries | — | — | May 29 | — | 365–730 |
| Serviceberries | — | — | May 29 | — | 730–1095 |
| Strawberries | — | — | May 29 | Aug 28 – Dec 11 | 90–365 |
🌿 Herbs to Grow in Douglas County
38 herbs that grow well in Zone 6b with planting dates for Douglas County.
Show all 38 herbs with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Angelica | Apr 3 | Apr 24 | May 1 | — | 365–730 |
| Anise | Apr 3 | Apr 24 | May 1 | Jul 31 – Oct 16 | 90–120 |
| Basil | Mar 20 | May 15 | May 22 | Jul 17 – Sep 18 | 50–75 |
| Bee Balm | — | — | May 15 | Aug 14 – Oct 30 | 90–120 |
| Borage | Apr 3 | Apr 24 | May 1 | Jun 26 – Aug 14 | 50–60 |
| Caraway | Apr 3 | Apr 24 | May 1 | — | 365–450 |
| Catnip | — | — | May 15 | Jul 17 – Sep 18 | 60–80 |
| Chamomile | Apr 3 | Apr 24 | May 1 | Jul 3 – Sep 11 | 60–90 |
| Chervil | Apr 3 | Apr 24 | May 1 | Jun 12 – Aug 14 | 40–60 |
| Chives | — | — | May 15 | Jul 17 – Sep 25 | 60–90 |
| Cilantro | Apr 3 | Apr 24 | May 1 | Jun 12 – Aug 14 | 40–60 |
| Comfrey | — | — | May 15 | Jul 17 – Sep 25 | 60–90 |
| Cumin | Apr 3 | Apr 24 | May 1 | Aug 14 – Oct 16 | 100–120 |
| Dill | Apr 3 | Apr 24 | May 1 | Jun 12 – Aug 14 | 40–60 |
| Echinacea | — | — | May 15 | Sep 18 – Nov 27 | 120–180 |
| Epazote | Mar 20 | May 15 | May 22 | Jul 10 – Sep 4 | 45–60 |
| Fennel (herb) | Apr 3 | Apr 24 | May 1 | Jul 3 – Sep 11 | 60–90 |
| Feverfew | — | — | May 15 | Aug 14 – Oct 30 | 90–120 |
| Garlic Chives | — | — | May 15 | Jul 17 – Sep 25 | 60–90 |
| Horehound | — | — | May 15 | Jul 31 – Sep 25 | 75–90 |
| Hyssop | — | — | May 15 | Jul 24 – Sep 25 | 70–90 |
| Lavender | — | — | May 15 | Aug 14 – Nov 27 | 90–200 |
| Lemon Balm | — | — | May 15 | Jul 17 – Sep 4 | 60–70 |
| Lemon Thyme | — | — | May 15 | Jul 24 – Sep 25 | 70–90 |
| Lovage | — | — | May 15 | Jul 24 – Sep 25 | 70–90 |
| Marjoram | — | — | May 15 | Jul 17 – Sep 25 | 60–90 |
| Mint | — | — | May 15 | Jul 17 – Sep 25 | 60–90 |
| Oregano | — | — | May 15 | Jul 17 – Sep 25 | 60–90 |
| Parsley | Apr 3 | Apr 24 | May 1 | Jul 3 – Sep 4 | 60–80 |
| Rue | — | — | May 15 | Jul 24 – Sep 25 | 70–90 |
| Sage | — | — | May 15 | Jul 31 – Sep 25 | 75–90 |
| Savory | — | — | May 15 | Jul 10 – Sep 4 | 50–70 |
| Sorrel | Apr 3 | Apr 24 | May 1 | Jun 12 – Aug 14 | 40–60 |
| Tarragon | — | — | May 15 | Jul 17 – Sep 25 | 60–90 |
| Thai Basil | Mar 20 | May 15 | May 22 | Jul 17 – Sep 18 | 50–75 |
| Thyme | — | — | May 15 | Jul 24 – Sep 25 | 70–90 |
| Valerian | — | — | May 15 | Sep 18 – Nov 27 | 120–180 |
| Yarrow | — | — | May 15 | Aug 14 – Oct 30 | 90–120 |
Monthly Planting Guide for Douglas County
Gardening Guides & Resources
Helpful guides from The Ultimate Homestead to improve your garden in Douglas County.
Frequently Asked Questions
What planting zone is Douglas County, WA?
Douglas County is in USDA Hardiness Zone 6b. 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 Douglas County, WA?
Based on 31 years of NOAA weather station data, the median last spring frost in Douglas County falls around May 8. In 8 out of 10 years, last frost lands between March 24 and June 10 — a 77-day window of variability. Use June 10 as your conservative safe-to-plant date for frost-sensitive crops.
When is the first fall frost in Douglas County, WA?
The median first fall frost in Douglas County arrives around October 4. In cold years it can arrive as early as September 12; in mild years as late as November 3. Harvest or protect frost-sensitive crops — tomatoes, peppers, basil, squash — before this date.
How long is the growing season in Douglas County?
Douglas County has a frost-free growing season of approximately 149 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 shorter by about 5.39 days per decade.
What is the soil like in Douglas County for gardening?
Douglas County has predominantly Silt Loam soil with a pH range of 5.5–6.2 and Well Drained drainage. Most vegetables and herbs grow well with standard composting and seasonal soil amendment.
What is grown commercially in Douglas County?
Douglas County has commercial agriculture that includes Wheat, Hay, Potatoes, Apples, Berries. These crops reflect the local climate and soil conditions — what succeeds commercially often translates well to home gardens in the same area.
Is Douglas County a good location for home gardening?
Douglas County scores 42/100 (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 Douglas County gardeners in Zone 6b 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.
