Okanogan County, WA — Planting Guide
Okanogan County is in USDA Zone 5b. The average last spring frost is May 13 and the first fall frost is September 26, giving you a growing season of approximately 136 days.
At an elevation of 3,788 ft, Okanogan County receives approximately 21.3 in of rainfall annually. Summer highs average 83°F with winter lows around 19°F. The predominant soil type is Silt Loam.
Based on 31 years of NOAA climate station data, the last frost date here varies by 49 days year to year — ranging from April 17 in warm years to June 6 in cold years. The growing season is trending shorter by about 1.56 days per decade. Okanogan County scores 55/100 (Moderate) on the Microclimate Index.
🌡️ Zone
5b (-15°F to -10°F min)
❄️ Last Frost
May 13
🍂 First Frost
September 26
📅 Growing Season
136 days
⛰️ Elevation
3,788 ft
🌧️ Annual Rainfall
21.3 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 | 18 days | — | None |
| Feb | 2.4 in | 16 days | — | None |
| Mar | 2.3 in | 17 days | — | None |
| Apr | 1.4 in | 11 days | 2.9 in | High |
| May | 1.3 in | 10 days | 3 in | High |
| Jun | 0.7 in | 7 days | 3.6 in | Critical |
| Jul | 0.3 in | 3 days | 4 in | Critical |
| Aug | 0.4 in | 3 days | 3.9 in | Critical |
| Sep | 0.7 in | 4 days | 3.6 in | Critical |
| Oct | 1.7 in | 10 days | 2.6 in | High |
| Nov | 3.6 in | 18 days | — | None |
| Dec | 3.7 in | 15 days | — | None |
Annual total: 21.4 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.
Okanogan County Soil Profile
Soil Type
Silt Loam
Soil pH
5.4-6.5
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 6 | Oct 16 | 132 days |
| Cautious | May 23 | Oct 3 | 133 days |
| Average year | May 13 | Sep 26 | 136 days |
| Optimistic | May 8 | Sep 16 | 131 days |
| Aggressive (risky) | Apr 17 | Sep 7 | 143 days |
Not very — frost dates can vary by ±49 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 1.6 days per decade). Use the "Conservative" dates and choose fast-maturing varieties.
Gardening Difficulty Score
Okanogan County presents some gardening challenges. Choose adapted varieties and plan around frost dates.
Local Gardening Help in Okanogan 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 Okanogan County's climate and soil.
County Extension Office
Okanogan 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 Okanogan County
Finding local nurseries & garden centers in Okanogan County
Why Buy Local
Local nurseries carry plants that are proven to grow in your area. Staff can give you advice specific to Okanogan 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 Okanogan County WA" or "garden center Okanogan 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 Okanogan County WA" or check your extension office and local parks department. Facebook groups like "Okanogan 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
15.9 hours
Summer solstice daylight
Shortest Day
8.1 hours
Winter solstice daylight
Peak Sun Hours
10.5 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 | 8.5 hr | 2.1 hr | Short day |
| February | 9.9 hr | 3 hr | Short day |
| March | 11.6 hr | 4.1 hr | Short day |
| April | 13.4 hr | 5.9 hr | Neutral |
| May | 15 hr | 7.8 hr | Long day |
| June | 15.9 hr | 9 hr | Long day |
| July | 15.5 hr | 10.5 hr | Long day |
| August | 14.1 hr | 9.2 hr | Long day |
| September | 12.3 hr | 7.3 hr | Neutral |
| October | 10.5 hr | 4.1 hr | Short day |
| November | 8.9 hr | 2.1 hr | Short day |
| December | 8.1 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 Jul through Aug.
Best Month to Compost
Jul
Microbial activity peaks when soil is warm.
Active Composting
4 months
Short season — insulate pile or use indoor vermicomposting.
View detailed monthly data
| Month | Soil 4" Deep | Soil 8" Deep | Compost Activity | Time to Finish |
|---|---|---|---|---|
| Jan | 12°F | 21°F | ❄️ Dormant | ~36 weeks |
| Feb | 13°F | 20°F | ❄️ Dormant | ~36 weeks |
| Mar | 23°F | 25°F | ❄️ Dormant | ~36 weeks |
| Apr | 33°F | 32°F | ❄️ Dormant | ~36 weeks |
| May | 49°F | 45°F | 🐢 Slow | ~24 weeks |
| Jun | 57°F | 54°F | ♻️ Active | ~14 weeks |
| Jul | 65°F | 61°F | 🔥 Peak | ~8 weeks |
| Aug | 67°F | 64°F | 🔥 Peak | ~8 weeks |
| Sep | 59°F | 57°F | ♻️ Active | ~14 weeks |
| Oct | 46°F | 49°F | 🐢 Slow | ~24 weeks |
| Nov | 34°F | 39°F | ❄️ Dormant | ~36 weeks |
| Dec | 21°F | 26°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 Okanogan 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 5 common pests in your area
| Pest | Risk Level | Peak Months |
|---|---|---|
| Aphids | Moderate | May, Jun, Jul, Aug |
| Japanese beetles | Moderate | Jun, Jul, Aug |
| Squash bugs | Moderate | Jun, Jul, Aug |
| Tomato hornworms | Moderate | Jul, Aug |
| Cabbage loopers | Low | May, Jun, Jul, Aug |
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 Okanogan County
Cover crops protect bare soil, fix nitrogen, suppress weeds, and improve soil structure — with county-specific planting dates.
Fall Cover Crops (6 options) — Plant after harvest to protect soil over winter
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Austrian winter peas | Jul 16 | Apr 22 | ✓ Yes | Fixes nitrogen, good for heavy clay soils |
| Daikon radish | Jul 31 | Apr 22 | — | Deep taproot breaks compaction, excellent for clay soils |
| Hairy vetch | Jul 14 | Apr 29 | ✓ Yes | Excellent nitrogen fixer, good for depleted soils |
| Oats | Aug 14 | Apr 29 | — | Quick biomass, winterkills in cold zones — no spring tillage needed |
| Winter rye | Jun 19 | Apr 29 | — | Suppresses weeds, prevents erosion, breaks up compacted soil |
| Winter wheat | Jul 4 | Apr 29 | — | Erosion control, weed suppression, good biomass |
Spring Cover Crops (3 options) — Build soil before the main growing season
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Buckwheat | May 15 | Jul 25 | — | Rapid growth, attracts pollinators, suppresses weeds |
| Sorghum-sudan grass | May 17 | Jul 18 | — | Massive biomass, breaks compaction, suppresses nematodes |
| White clover | Apr 15 | Jul 25 | ✓ 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 | Jun 2 | Sep 12 | — | 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: 12 mph Summer: 9 mph
Fall: 10 mph Winter: 14 mph
Prevailing wind: SW. Moderate wind — consider a temporary windbreak for young seedlings.
Windbreak Benefit
7.4/10
Strongly recommended — a windbreak (fence, hedge, or row of tall crops like corn or sunflowers) will significantly improve garden yields.
Frost Pocket Risk
Moderate
Some terrain variation (850 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
10,665 gal
Per 1,000 sq ft of roof area (at 80% collection efficiency)
Recommended Setup
7 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
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 21.4 inches of rain per year
- A 1,000 sq ft roof can collect roughly 10,665 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 Okanogan County
Soil Type
Silt Loam
Soil pH 5.4–6.5 · Excessively Drained drainage
Native soil is well-suited to most vegetables and herbs with regular compost additions.
Watering Needs
Drought stress: 1.5/10
Okanogan County has very low drought pressure. Natural rainfall usually meets garden needs — water only during extended dry spells.
Season Tips
136-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 Okanogan County
106 vegetables that grow well in Zone 5b with planting dates for Okanogan County.
Show all 106 vegetables with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Acorn Squash | Apr 8 | May 20 | May 27 | Aug 19 – Sep 23 | 80–100 |
| Amaranth | Mar 18 | May 20 | May 27 | Aug 26 – Oct 14 | 90–120 |
| Arugula | Apr 8 | Apr 29 | May 13 | Jun 17 – Aug 19 | 30–50 |
| Asparagus | — | — | May 27 | — | 730–1095 |
| Beets | — | Apr 29 | — | Jun 24 – Jul 22 | 50–70 |
| Belgian Endive | Apr 8 | Apr 29 | May 13 | Sep 2 – Oct 28 | 110–150 |
| Bitter Melon | Mar 18 | May 20 | May 27 | Jul 29 – Sep 9 | 60–90 |
| Black Beans | — | May 20 | — | Aug 19 – Oct 7 | 90–120 |
| Bok Choy | Apr 8 | Apr 29 | May 13 | Jun 24 – Jul 29 | 40–60 |
| Broccoli | Apr 8 | Apr 29 | May 13 | Jul 15 – Aug 26 | 60–90 |
| Broccoli Rabe | Apr 8 | Apr 29 | May 13 | Jun 24 – Jul 29 | 40–60 |
| Brussels Sprouts | Apr 8 | Apr 29 | May 13 | Aug 12 – Oct 7 | 90–130 |
| Butternut Squash | Apr 8 | May 20 | May 27 | Aug 26 – Sep 30 | 85–110 |
| Cabbage | Apr 8 | Apr 29 | May 13 | Jul 15 – Sep 9 | 60–100 |
| Calabash | Mar 18 | May 20 | May 27 | Aug 19 – Oct 14 | 80–120 |
| Carrots | — | Apr 29 | — | Jul 1 – Aug 5 | 60–80 |
| Cauliflower | Apr 8 | Apr 29 | May 13 | Jul 8 – Sep 9 | 55–100 |
| Celeriac | Apr 8 | Apr 29 | May 13 | Aug 26 – Sep 30 | 100–120 |
| Celery | Apr 8 | Apr 29 | May 13 | Aug 5 – Sep 30 | 80–120 |
| Celtuce | Apr 8 | Apr 29 | May 13 | Jul 15 – Aug 26 | 60–90 |
| Chard | Apr 8 | Apr 29 | May 13 | Jul 8 – Aug 26 | 50–60 |
| Chickpeas | Apr 8 | Apr 29 | May 13 | Aug 5 – Sep 16 | 80–110 |
| Chicory | Apr 8 | Apr 29 | May 13 | Jul 15 – Aug 26 | 60–85 |
| Chinese Cabbage | Apr 8 | Apr 29 | May 13 | Jul 8 – Aug 5 | 50–70 |
| Christmas Lima Beans | Mar 18 | May 20 | May 27 | Aug 19 – Sep 23 | 80–100 |
| Collard Greens | Apr 8 | Apr 29 | May 13 | Jul 8 – Sep 9 | 55–75 |
| Corn | — | May 20 | — | Jul 22 – Sep 16 | 60–100 |
| Cowpeas | — | May 20 | — | Jul 22 – Sep 2 | 60–90 |
| Cress | Apr 8 | Apr 29 | May 13 | May 27 – Jun 17 | 14–21 |
| Crookneck Squash | Apr 8 | May 20 | May 27 | Jul 15 – Aug 12 | 45–60 |
| Crosne | — | Apr 29 | — | Sep 30 – Oct 14 | 150–200 |
| Cucumber | Apr 8 | May 20 | May 27 | Jul 22 – Sep 16 | 50–70 |
| Daikon | — | Apr 29 | — | Jun 24 – Jul 22 | 50–70 |
| Delicata Squash | Apr 8 | May 20 | May 27 | Aug 19 – Sep 23 | 80–100 |
| Edamame | — | May 20 | — | Aug 5 – Sep 16 | 75–100 |
| Eggplant | Mar 4 | May 20 | May 27 | Aug 5 – Oct 7 | 65–85 |
| Endive | Apr 8 | Apr 29 | May 13 | Jul 1 – Aug 5 | 45–65 |
| Escarole | Apr 8 | Apr 29 | May 13 | Jul 8 – Aug 5 | 50–70 |
| Fava Beans | Apr 8 | Apr 29 | May 13 | Jul 29 – Sep 9 | 75–100 |
| Fennel | Mar 18 | May 20 | May 27 | Jul 29 – Sep 9 | 60–90 |
| Garlic | — | — | — | — | 90–240 |
| Green Beans | — | May 20 | — | Jul 15 – Sep 9 | 50–65 |
| Horseradish | — | — | May 27 | Sep 30 – Nov 11 | 120–180 |
| Hot Peppers | Mar 4 | May 20 | May 27 | Aug 5 – Nov 11 | 70–120 |
| Hubbard Squash | Apr 8 | May 20 | May 27 | Sep 9 – Oct 14 | 100–120 |
| Kabocha | Apr 8 | May 20 | May 27 | Aug 26 – Sep 23 | 85–100 |
| Kai Lan | Apr 8 | Apr 29 | May 13 | Jul 1 – Jul 29 | 45–60 |
| Kale | Apr 8 | Apr 29 | May 13 | Jul 8 – Sep 2 | 50–70 |
| Kidney Beans | — | May 20 | — | Aug 19 – Sep 23 | 85–110 |
| Kohlrabi | Apr 8 | Apr 29 | May 13 | Jul 1 – Aug 5 | 45–65 |
| Komatsuna | Apr 8 | Apr 29 | May 13 | Jun 17 – Jul 22 | 35–50 |
| Leeks | Apr 8 | Apr 29 | May 13 | Aug 12 – Oct 28 | 90–150 |
| Lentils | Apr 8 | Apr 29 | May 13 | Aug 5 – Sep 16 | 80–110 |
| Lettuce | Apr 8 | Apr 29 | May 13 | Jun 17 – Aug 26 | 30–60 |
| Lima Beans | — | May 20 | — | Jul 22 – Sep 2 | 60–90 |
| Mache | Apr 8 | Apr 29 | May 13 | Jun 24 – Jul 29 | 40–60 |
| Melon | Apr 8 | May 20 | May 27 | Aug 5 – Sep 23 | 70–100 |
| Microgreens | Apr 8 | Apr 29 | May 13 | May 20 – Jun 17 | 7–21 |
| Mitsuba | Apr 8 | Apr 29 | May 6 | Jul 1 – Aug 26 | 50–70 |
| Mizuna | Apr 8 | Apr 29 | May 13 | Jun 17 – Jul 15 | 30–45 |
| Mustard Greens | Apr 8 | Apr 29 | May 13 | Jun 17 – Aug 19 | 30–50 |
| Napa Cabbage | Apr 8 | Apr 29 | May 13 | Jul 8 – Aug 12 | 55–75 |
| New Zealand Spinach | Mar 18 | May 20 | May 27 | Jul 22 – Aug 19 | 55–70 |
| Okra | Mar 18 | May 20 | May 27 | Jul 22 – Sep 16 | 50–65 |
| Onion | Apr 8 | Apr 29 | May 13 | Aug 12 – Sep 30 | 90–120 |
| Pac Choi | Apr 8 | Apr 29 | May 13 | Jun 24 – Jul 22 | 40–55 |
| Parsnip | — | Apr 29 | — | Aug 12 – Sep 23 | 100–130 |
| Patty Pan Squash | Apr 8 | May 20 | May 27 | Jul 15 – Aug 12 | 45–60 |
| Peas | Apr 8 | Apr 29 | May 13 | Jul 8 – Sep 2 | 55–70 |
| Peppers | Mar 4 | May 20 | May 27 | Jul 29 – Oct 7 | 60–90 |
| Pole Beans | Mar 18 | May 20 | May 27 | Jul 22 – Sep 16 | 55–70 |
| Potatoes | Mar 18 | May 20 | May 27 | Aug 5 – Oct 14 | 70–120 |
| Pumpkin | Apr 8 | May 20 | May 27 | Aug 26 – Oct 14 | 85–120 |
| Purslane | Apr 8 | Apr 29 | May 13 | Jun 24 – Jul 29 | 40–60 |
| Radicchio | Apr 8 | Apr 29 | May 13 | Jul 15 – Aug 19 | 60–80 |
| Radish | — | Apr 29 | — | May 27 – Jun 17 | 22–35 |
| Rhubarb | — | — | Jun 3 | — | 365–730 |
| Romanesco | Apr 8 | Apr 29 | May 13 | Jul 29 – Sep 9 | 75–100 |
| Rutabaga | — | Apr 29 | — | Jul 22 – Aug 26 | 80–100 |
| Salsify | — | Apr 29 | — | Aug 12 – Sep 23 | 100–130 |
| Savoy Cabbage | Apr 8 | Apr 29 | May 13 | Jul 22 – Sep 16 | 70–110 |
| Scallions | Apr 8 | Apr 29 | May 13 | Jul 8 – Aug 5 | 50–70 |
| Scarlet Runner Beans | Mar 18 | May 20 | May 27 | Jul 29 – Sep 2 | 60–80 |
| Shallot | Apr 8 | Apr 29 | May 13 | Aug 12 – Sep 30 | 90–120 |
| Shiso | Mar 25 | May 20 | May 27 | Jul 22 – Sep 16 | 50–70 |
| Snap Peas | Mar 18 | May 20 | May 27 | Jul 22 – Sep 16 | 55–70 |
| Snow Peas | Apr 8 | Apr 29 | May 13 | Jul 8 – Sep 2 | 50–65 |
| Soybeans | — | May 20 | — | Aug 12 – Oct 7 | 80–120 |
| Spaghetti Squash | Apr 8 | May 20 | May 27 | Aug 26 – Sep 23 | 85–100 |
| Spinach | Apr 8 | Apr 29 | May 13 | Jun 17 – Aug 19 | 35–50 |
| Squash (Summer) | Apr 8 | May 20 | May 27 | Jul 15 – Sep 16 | 45–65 |
| Squash (Winter) | Apr 8 | May 20 | May 27 | Aug 19 – Oct 14 | 80–120 |
| Sunchoke | — | — | May 27 | Sep 16 – Nov 11 | 110–150 |
| Sunflower | Mar 18 | May 20 | May 27 | Aug 5 – Sep 23 | 70–100 |
| Sweet Corn | — | May 20 | — | Jul 22 – Sep 2 | 60–90 |
| Sweet Potatoes | Mar 18 | May 20 | May 27 | Aug 26 – Oct 14 | 90–120 |
| Tatsoi | Apr 8 | Apr 29 | May 13 | Jun 17 – Jul 22 | 35–50 |
| Tomatillo | Mar 18 | May 20 | May 27 | Jul 29 – Oct 7 | 60–85 |
| Tomatoes | Mar 18 | May 20 | May 27 | Jul 29 – Oct 7 | 60–85 |
| Turnip | — | Apr 29 | — | Jun 10 – Jul 15 | 40–60 |
| Watercress | Apr 8 | Apr 29 | May 13 | Jun 24 – Jul 29 | 40–60 |
| Watermelon | Apr 8 | May 20 | May 27 | Aug 5 – Sep 23 | 70–100 |
| Wax Beans | — | May 20 | — | Jul 15 – Sep 9 | 50–65 |
| Winter Melon | Mar 18 | May 20 | May 27 | Aug 26 – Oct 14 | 90–120 |
| Yard Long Beans | Mar 18 | May 20 | May 27 | Jul 22 – Sep 2 | 55–80 |
| Zucchini | Apr 8 | May 20 | May 27 | Jul 15 – Sep 9 | 45–60 |
🍓 Fruits to Grow in Okanogan County
27 fruits that grow well in Zone 5b with planting dates for Okanogan County.
Show all 27 fruits with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Alpine Strawberries | — | — | Jun 3 | Sep 2 – Nov 18 | 90–180 |
| Aronia | — | — | Jun 3 | — | 730–1095 |
| Blackberries | — | — | Jun 3 | — | 365–730 |
| Blueberries | — | — | Jun 3 | — | 730–1095 |
| Boysenberries | — | — | Jun 3 | — | 365–730 |
| Cantaloupe | — | — | Jun 3 | Aug 12 – Sep 16 | 70–90 |
| Che Fruit | — | — | Jun 3 | — | 1095–1825 |
| Cranberries | — | — | Jun 3 | — | 730–1095 |
| Currants | — | — | Jun 3 | — | 730–1095 |
| Elderberries | — | — | Jun 3 | — | 730–1095 |
| Goji Berries | — | — | Jun 3 | — | 730–1095 |
| Gooseberries | — | — | Jun 3 | — | 730–1095 |
| Grapes | — | — | Jun 3 | — | 730–1095 |
| Ground Cherry | — | — | Jun 3 | Aug 12 – Oct 7 | 65–80 |
| Hardy Kiwi | — | — | Jun 3 | — | 1095–1825 |
| Haskaps | — | — | Jun 3 | — | 730–1095 |
| Honeydew | — | — | Jun 3 | Aug 26 – Oct 7 | 80–110 |
| Jostaberry | — | — | Jun 3 | — | 730–1095 |
| Lingonberries | — | — | Jun 3 | — | 730–1095 |
| Medlar | — | — | Jun 3 | — | 1095–1825 |
| Mulberries | — | — | Jun 3 | — | 730–1825 |
| Pawpaw | — | — | Jun 3 | — | 1095–2555 |
| Persimmon | — | — | Jun 3 | — | 1095–2555 |
| Quince | — | — | Jun 3 | — | 1095–1825 |
| Raspberries | — | — | Jun 3 | — | 365–730 |
| Serviceberries | — | — | Jun 3 | — | 730–1095 |
| Strawberries | — | — | Jun 3 | Sep 2 – Nov 18 | 90–365 |
🌿 Herbs to Grow in Okanogan County
37 herbs that grow well in Zone 5b with planting dates for Okanogan County.
Show all 37 herbs with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Angelica | Apr 8 | Apr 29 | May 6 | — | 365–730 |
| Anise | Apr 8 | Apr 29 | May 6 | Aug 5 – Oct 21 | 90–120 |
| Basil | Mar 25 | May 20 | May 27 | Jul 22 – Sep 23 | 50–75 |
| Bee Balm | — | — | May 20 | Aug 19 – Nov 4 | 90–120 |
| Borage | Apr 8 | Apr 29 | May 6 | Jul 1 – Aug 19 | 50–60 |
| Caraway | Apr 8 | Apr 29 | May 6 | — | 365–450 |
| Catnip | — | — | May 20 | Jul 22 – Sep 23 | 60–80 |
| Chamomile | Apr 8 | Apr 29 | May 6 | Jul 8 – Sep 16 | 60–90 |
| Chervil | Apr 8 | Apr 29 | May 6 | Jun 17 – Aug 19 | 40–60 |
| Chives | — | — | May 20 | Jul 22 – Sep 30 | 60–90 |
| Cilantro | Apr 8 | Apr 29 | May 6 | Jun 17 – Aug 19 | 40–60 |
| Comfrey | — | — | May 20 | Jul 22 – Sep 30 | 60–90 |
| Cumin | Apr 8 | Apr 29 | May 6 | Aug 19 – Oct 21 | 100–120 |
| Dill | Apr 8 | Apr 29 | May 6 | Jun 17 – Aug 19 | 40–60 |
| Echinacea | — | — | May 20 | Sep 23 – Nov 4 | 120–180 |
| Epazote | Mar 25 | May 20 | May 27 | Jul 15 – Sep 9 | 45–60 |
| Fennel (herb) | Apr 8 | Apr 29 | May 6 | Jul 8 – Sep 16 | 60–90 |
| Feverfew | — | — | May 20 | Aug 19 – Nov 4 | 90–120 |
| Garlic Chives | — | — | May 20 | Jul 22 – Sep 30 | 60–90 |
| Horehound | — | — | May 20 | Aug 5 – Sep 30 | 75–90 |
| Hyssop | — | — | May 20 | Jul 29 – Sep 30 | 70–90 |
| Lavender | — | — | May 20 | Aug 19 – Nov 4 | 90–200 |
| Lemon Balm | — | — | May 20 | Jul 22 – Sep 9 | 60–70 |
| Lemon Thyme | — | — | May 20 | Jul 29 – Sep 30 | 70–90 |
| Lovage | — | — | May 20 | Jul 29 – Sep 30 | 70–90 |
| Mint | — | — | May 20 | Jul 22 – Sep 30 | 60–90 |
| Oregano | — | — | May 20 | Jul 22 – Sep 30 | 60–90 |
| Parsley | Apr 8 | Apr 29 | May 6 | Jul 8 – Sep 9 | 60–80 |
| Rue | — | — | May 20 | Jul 29 – Sep 30 | 70–90 |
| Sage | — | — | May 20 | Aug 5 – Sep 30 | 75–90 |
| Savory | — | — | May 20 | Jul 15 – Sep 9 | 50–70 |
| Sorrel | Apr 8 | Apr 29 | May 6 | Jun 17 – Aug 19 | 40–60 |
| Tarragon | — | — | May 20 | Jul 22 – Sep 30 | 60–90 |
| Thai Basil | Mar 25 | May 20 | May 27 | Jul 22 – Sep 23 | 50–75 |
| Thyme | — | — | May 20 | Jul 29 – Sep 30 | 70–90 |
| Valerian | — | — | May 20 | Sep 23 – Nov 4 | 120–180 |
| Yarrow | — | — | May 20 | Aug 19 – Nov 4 | 90–120 |
Monthly Planting Guide for Okanogan County
Gardening Guides & Resources
Helpful guides from The Ultimate Homestead to improve your garden in Okanogan County.
Frequently Asked Questions
What planting zone is Okanogan County, WA?
Okanogan County is in USDA Hardiness Zone 5b. 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 Okanogan County, WA?
Based on 31 years of NOAA weather station data, the median last spring frost in Okanogan County falls around May 13. In 8 out of 10 years, last frost lands between April 17 and June 6 — a 49-day window of variability. Use June 6 as your conservative safe-to-plant date for frost-sensitive crops.
When is the first fall frost in Okanogan County, WA?
The median first fall frost in Okanogan County arrives around September 26. In cold years it can arrive as early as September 7; in mild years as late as October 16. Harvest or protect frost-sensitive crops — tomatoes, peppers, basil, squash — before this date.
How long is the growing season in Okanogan County?
Okanogan County has a frost-free growing season of approximately 136 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 1.56 days per decade.
What is the soil like in Okanogan County for gardening?
Okanogan County has predominantly Silt Loam soil with a pH range of 5.4–6.5 and Excessively Drained drainage. Most vegetables and herbs grow well with standard composting and seasonal soil amendment.
What is grown commercially in Okanogan County?
Okanogan County has commercial agriculture that includes Wheat, Apples, Hay, Potatoes, Berries. These crops reflect the local climate and soil conditions — what succeeds commercially often translates well to home gardens in the same area.
Is Okanogan County a good location for home gardening?
Okanogan County scores 55/100 (Moderate) on our Microclimate Index, which combines frost reliability, drought pressure, soil challenge, elevation risk, and long-term climate trend. Conditions here are moderate — most common crops grow well with standard timing and care.
Plan Your Garden with Confidence
Get our free Garden Planner — designed to help Okanogan County gardeners in Zone 5b organize planting dates, track what's growing, and never miss a planting window.
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