Lewis County, WA — Planting Guide
Lewis County is in USDA Zone 7b. The average last spring frost is April 25 and the first fall frost is October 24, giving you a growing season of approximately 182 days.
At an elevation of 327 ft, Lewis County receives approximately 37.3 in of rainfall annually. Summer highs average 86°F with winter lows around 37°F. The predominant soil type is Silt Loam.
Based on 31 years of NOAA climate station data, the last frost date here varies by 91 days year to year — ranging from March 24 in warm years to June 24 in cold years. The growing season is trending shorter by about 6.71 days per decade. Lewis County scores 64/100 (Good) on the Microclimate Index.
🌡️ Zone
7b (5°F to 10°F min)
❄️ Last Frost
April 25
🍂 First Frost
October 24
📅 Growing Season
182 days
⛰️ Elevation
327 ft
🌧️ Annual Rainfall
37.3 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 | 5.6 in | 15 days | — | None |
| Feb | 3.6 in | 15 days | — | None |
| Mar | 4.1 in | 14 days | 0.2 in | Low |
| Apr | 2.8 in | 13 days | 1.5 in | Moderate |
| May | 2 in | 10 days | 2.3 in | High |
| Jun | 1.3 in | 6 days | 3 in | High |
| Jul | 0.6 in | 2 days | 3.7 in | Critical |
| Aug | 0.6 in | 3 days | 3.7 in | Critical |
| Sep | 1.4 in | 5 days | 2.9 in | High |
| Oct | 3.4 in | 10 days | 0.9 in | Moderate |
| Nov | 6.3 in | 14 days | — | None |
| Dec | 5.7 in | 16 days | — | None |
Annual total: 37.4 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.
Lewis County Soil Profile
Soil Type
Silt Loam
Soil pH
5.6-6.2
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 24 | Nov 21 | 150 days |
| Cautious | Jun 8 | Nov 3 | 148 days |
| Average year | Apr 25 | Oct 24 | 182 days |
| Optimistic | Apr 13 | Sep 30 | 170 days |
| Aggressive (risky) | Mar 24 | Aug 26 | 155 days |
Not very — frost dates can vary by ±91 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 6.7 days per decade). Use the "Conservative" dates and choose fast-maturing varieties.
Gardening Difficulty Score
Lewis County offers good growing conditions. A little planning around frost dates goes a long way.
Local Gardening Help in Lewis 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 Lewis County's climate and soil.
County Extension Office
Lewis 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 Lewis County
Finding local nurseries & garden centers in Lewis County
Why Buy Local
Local nurseries carry plants that are proven to grow in your area. Staff can give you advice specific to Lewis 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 Lewis County WA" or "garden center Lewis 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 Lewis County WA" or check your extension office and local parks department. Facebook groups like "Lewis 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
15.6 hours
Summer solstice daylight
Shortest Day
8.4 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 | 8.8 hr | 2.3 hr | Short day |
| February | 10.1 hr | 2.9 hr | Short day |
| March | 11.6 hr | 3.9 hr | Short day |
| April | 13.3 hr | 5.7 hr | Neutral |
| May | 14.8 hr | 7.8 hr | Long day |
| June | 15.6 hr | 8.3 hr | Long day |
| July | 15.3 hr | 10.9 hr | Long day |
| August | 14 hr | 9.6 hr | Long day |
| September | 12.3 hr | 7 hr | Neutral |
| October | 10.6 hr | 4.1 hr | Short day |
| November | 9.1 hr | 2.2 hr | Short day |
| December | 8.4 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 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 | 43°F | ❄️ Dormant | ~36 weeks |
| Feb | 36°F | 44°F | ❄️ Dormant | ~36 weeks |
| Mar | 47°F | 46°F | 🐢 Slow | ~24 weeks |
| Apr | 56°F | 55°F | ♻️ Active | ~14 weeks |
| May | 66°F | 65°F | 🔥 Peak | ~8 weeks |
| Jun | 75°F | 72°F | 🔥 Peak | ~8 weeks |
| Jul | 86°F | 78°F | 🔥 Peak | ~8 weeks |
| Aug | 85°F | 81°F | 🔥 Peak | ~8 weeks |
| Sep | 79°F | 79°F | 🔥 Peak | ~8 weeks |
| Oct | 69°F | 70°F | 🔥 Peak | ~8 weeks |
| Nov | 56°F | 58°F | ♻️ Active | ~14 weeks |
| Dec | 43°F | 49°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 Lewis 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 | High | May, Jun, Jul |
| Stink bugs | Moderate | 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 Lewis 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 1 | Aug 15 | — | Rapid growth, attracts pollinators, suppresses weeds |
| Cowpeas (southern peas) | Apr 26 | Aug 22 | ✓ Yes | Excellent nitrogen fixer for warm climates, edible |
| Sorghum-sudan grass | Apr 30 | Aug 29 | — | Massive biomass, breaks compaction, suppresses nematodes |
| White clover | Mar 30 | Aug 22 | ✓ 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 17 | Oct 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 28 | Apr 11 | ✓ Yes | Fixes nitrogen, good for heavy clay soils |
| Crimson clover | Aug 31 | Apr 11 | ✓ Yes | Fixes nitrogen, attracts pollinators in spring |
| Daikon radish | Sep 2 | Apr 11 | — | Deep taproot breaks compaction, excellent for clay soils |
| Hairy vetch | Aug 14 | Apr 4 | ✓ Yes | Excellent nitrogen fixer, good for depleted soils |
| Oats | Sep 22 | Apr 4 | — | Quick biomass, winterkills in cold zones — no spring tillage needed |
| Winter rye | Jul 20 | Apr 4 | — | Suppresses weeds, prevents erosion, breaks up compacted soil |
| Winter wheat | Jul 20 | Apr 11 | — | 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: 13 mph Summer: 8 mph
Fall: 8 mph Winter: 14 mph
Prevailing wind: SW. Moderate wind — consider a temporary windbreak for young seedlings.
Windbreak Benefit
5.5/10
Moderately beneficial — a simple fence or trellis can protect delicate crops from wind stress.
Frost Pocket Risk
Moderate
Some terrain variation (416 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
18,640 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 2,250 gal tank.
Legal Status
Unrestricted
Rainwater harvesting is fully legal in your state with no restrictions.
Best Collection Months
Jan, Mar, Nov, Dec
Highest rainfall months — your barrels will fill up quickly during these months.
Months to Draw From Storage
Jul, Aug
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 37.4 inches of rain per year
- A 1,000 sq ft roof can collect roughly 18,640 gallons annually
- Rainwater harvesting is fully legal in your state
- Use a first-flush diverter to keep roof debris out of your collection
Soil & Growing Conditions in Lewis County
Soil Type
Silt Loam
Soil pH 5.6–6.2 · Well Drained drainage
Native soil is well-suited to most vegetables and herbs with regular compost additions.
Watering Needs
Drought stress: 1.5/10
Lewis County has very low drought pressure. Natural rainfall usually meets garden needs — water only during extended dry spells.
Season Tips
182-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.
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 Lewis County
113 vegetables that grow well in Zone 7b with planting dates for Lewis County.
Show all 113 vegetables with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Acorn Squash | Mar 28 | May 2 | May 9 | Aug 1 – Sep 5 | 80–100 |
| Amaranth | Mar 7 | May 2 | May 9 | Aug 8 – Sep 26 | 90–120 |
| Artichoke | — | — | May 9 | Sep 12 – Nov 21 | 120–180 |
| Arugula | Mar 21 | Apr 11 | Apr 25 | May 30 – Aug 1 | 30–50 |
| Asparagus | — | — | May 9 | — | 730–1095 |
| Beets | — | Apr 11 | — | Jun 6 – Jul 4 | 50–70 |
| Belgian Endive | Mar 21 | Apr 11 | Apr 25 | Aug 15 – Oct 10 | 110–150 |
| Bitter Melon | Mar 7 | May 2 | May 9 | Jul 11 – Aug 22 | 60–90 |
| Black Beans | — | May 2 | — | Aug 1 – Sep 19 | 90–120 |
| Bok Choy | Mar 21 | Apr 11 | Apr 25 | Jun 6 – Jul 11 | 40–60 |
| Broccoli | Mar 21 | Apr 11 | Apr 25 | Jun 27 – Aug 8 | 60–90 |
| Broccoli Rabe | Mar 21 | Apr 11 | Apr 25 | Jun 6 – Jul 11 | 40–60 |
| Brussels Sprouts | Mar 21 | Apr 11 | Apr 25 | Jul 25 – Sep 19 | 90–130 |
| Butternut Squash | Mar 28 | May 2 | May 9 | Aug 8 – Sep 12 | 85–110 |
| Cabbage | Mar 21 | Apr 11 | Apr 25 | Jun 27 – Aug 22 | 60–100 |
| Calabash | Mar 7 | May 2 | May 9 | Aug 1 – Sep 26 | 80–120 |
| Cardoon | — | — | May 9 | Sep 12 – Oct 24 | 120–150 |
| Carrots | — | Apr 11 | — | Jun 13 – Jul 18 | 60–80 |
| Cauliflower | Mar 21 | Apr 11 | Apr 25 | Jun 20 – Aug 22 | 55–100 |
| Celeriac | Mar 21 | Apr 11 | Apr 25 | Aug 8 – Sep 12 | 100–120 |
| Celery | Mar 21 | Apr 11 | Apr 25 | Jul 18 – Sep 12 | 80–120 |
| Celtuce | Mar 21 | Apr 11 | Apr 25 | Jun 27 – Aug 8 | 60–90 |
| Chard | Mar 21 | Apr 11 | Apr 25 | Jun 20 – Aug 8 | 50–60 |
| Chayote | Mar 7 | May 2 | May 9 | Sep 12 – Nov 21 | 120–180 |
| Chickpeas | Mar 21 | Apr 11 | Apr 25 | Jul 18 – Aug 29 | 80–110 |
| Chicory | Mar 21 | Apr 11 | Apr 25 | Jun 27 – Aug 8 | 60–85 |
| Chinese Cabbage | Mar 21 | Apr 11 | Apr 25 | Jun 20 – Jul 18 | 50–70 |
| Christmas Lima Beans | Mar 7 | May 2 | May 9 | Aug 1 – Sep 5 | 80–100 |
| Collard Greens | Mar 21 | Apr 11 | Apr 25 | Jun 20 – Aug 22 | 55–75 |
| Corn | — | May 2 | — | Jul 4 – Aug 29 | 60–100 |
| Cowpeas | — | May 2 | — | Jul 4 – Aug 15 | 60–90 |
| Cress | Mar 21 | Apr 11 | Apr 25 | May 9 – May 30 | 14–21 |
| Crookneck Squash | Mar 28 | May 2 | May 9 | Jun 27 – Jul 25 | 45–60 |
| Crosne | — | Apr 11 | — | Sep 12 – Nov 14 | 150–200 |
| Cucumber | Mar 28 | May 2 | May 9 | Jul 4 – Aug 29 | 50–70 |
| Daikon | — | Apr 11 | — | Jun 6 – Jul 4 | 50–70 |
| Delicata Squash | Mar 28 | May 2 | May 9 | Aug 1 – Sep 5 | 80–100 |
| Edamame | — | May 2 | — | Jul 18 – Aug 29 | 75–100 |
| Eggplant | Feb 21 | May 2 | May 9 | Jul 18 – Sep 19 | 65–85 |
| Endive | Mar 21 | Apr 11 | Apr 25 | Jun 13 – Jul 18 | 45–65 |
| Escarole | Mar 21 | Apr 11 | Apr 25 | Jun 20 – Jul 18 | 50–70 |
| Fava Beans | Mar 21 | Apr 11 | Apr 25 | Jul 11 – Aug 22 | 75–100 |
| Fennel | Mar 7 | May 2 | May 9 | Jul 11 – Aug 22 | 60–90 |
| Garlic | — | — | — | — | 90–240 |
| Green Beans | — | May 2 | — | Jun 27 – Aug 22 | 50–65 |
| Horseradish | — | — | May 9 | Sep 12 – Nov 21 | 120–180 |
| Hot Peppers | Feb 21 | May 2 | May 9 | Jul 18 – Oct 24 | 70–120 |
| Hubbard Squash | Mar 28 | May 2 | May 9 | Aug 22 – Sep 26 | 100–120 |
| Jicama | Mar 7 | May 2 | May 9 | Sep 12 – Nov 21 | 120–180 |
| Kabocha | Mar 28 | May 2 | May 9 | Aug 8 – Sep 5 | 85–100 |
| Kai Lan | Mar 21 | Apr 11 | Apr 25 | Jun 13 – Jul 11 | 45–60 |
| Kale | Mar 21 | Apr 11 | Apr 25 | Jun 20 – Aug 15 | 50–70 |
| Kidney Beans | — | May 2 | — | Aug 1 – Sep 5 | 85–110 |
| Kohlrabi | Mar 21 | Apr 11 | Apr 25 | Jun 13 – Jul 18 | 45–65 |
| Komatsuna | Mar 21 | Apr 11 | Apr 25 | May 30 – Jul 4 | 35–50 |
| Leeks | Mar 21 | Apr 11 | Apr 25 | Jul 25 – Oct 10 | 90–150 |
| Lentils | Mar 21 | Apr 11 | Apr 25 | Jul 18 – Aug 29 | 80–110 |
| Lettuce | Mar 21 | Apr 11 | Apr 25 | May 30 – Aug 8 | 30–60 |
| Lima Beans | — | May 2 | — | Jul 4 – Aug 15 | 60–90 |
| Loofah | Mar 7 | May 2 | May 9 | Aug 22 – Oct 24 | 100–150 |
| Luffa | Mar 7 | May 2 | May 9 | Aug 8 – Oct 24 | 90–150 |
| Mache | Mar 21 | Apr 11 | Apr 25 | Jun 6 – Jul 11 | 40–60 |
| Malabar Spinach | Mar 7 | May 2 | May 9 | Jul 4 – Aug 1 | 55–70 |
| Melon | Mar 28 | May 2 | May 9 | Jul 18 – Sep 5 | 70–100 |
| Microgreens | Mar 21 | Apr 11 | Apr 25 | May 2 – May 30 | 7–21 |
| Mitsuba | Mar 21 | Apr 11 | Apr 18 | Jun 13 – Aug 8 | 50–70 |
| Mizuna | Mar 21 | Apr 11 | Apr 25 | May 30 – Jun 27 | 30–45 |
| Mustard Greens | Mar 21 | Apr 11 | Apr 25 | May 30 – Aug 1 | 30–50 |
| Napa Cabbage | Mar 21 | Apr 11 | Apr 25 | Jun 20 – Jul 25 | 55–75 |
| New Zealand Spinach | Mar 7 | May 2 | May 9 | Jul 4 – Aug 1 | 55–70 |
| Okra | Mar 7 | May 2 | May 9 | Jul 4 – Aug 29 | 50–65 |
| Onion | Mar 21 | Apr 11 | Apr 25 | Jul 25 – Sep 12 | 90–120 |
| Pac Choi | Mar 21 | Apr 11 | Apr 25 | Jun 6 – Jul 4 | 40–55 |
| Parsnip | — | Apr 11 | — | Jul 25 – Sep 5 | 100–130 |
| Patty Pan Squash | Mar 28 | May 2 | May 9 | Jun 27 – Jul 25 | 45–60 |
| Peas | Mar 21 | Apr 11 | Apr 25 | Jun 20 – Aug 15 | 55–70 |
| Peppers | Feb 21 | May 2 | May 9 | Jul 11 – Sep 19 | 60–90 |
| Pole Beans | Mar 7 | May 2 | May 9 | Jul 4 – Aug 29 | 55–70 |
| Potatoes | Mar 7 | May 2 | May 9 | Jul 18 – Sep 26 | 70–120 |
| Pumpkin | Mar 28 | May 2 | May 9 | Aug 8 – Sep 26 | 85–120 |
| Purslane | Mar 21 | Apr 11 | Apr 25 | Jun 6 – Jul 11 | 40–60 |
| Radicchio | Mar 21 | Apr 11 | Apr 25 | Jun 27 – Aug 1 | 60–80 |
| Radish | — | Apr 11 | — | May 9 – May 30 | 22–35 |
| Rhubarb | — | — | May 16 | — | 365–730 |
| Romanesco | Mar 21 | Apr 11 | Apr 25 | Jul 11 – Aug 22 | 75–100 |
| Rutabaga | — | Apr 11 | — | Jul 4 – Aug 8 | 80–100 |
| Salsify | — | Apr 11 | — | Jul 25 – Sep 5 | 100–130 |
| Savoy Cabbage | Mar 21 | Apr 11 | Apr 25 | Jul 4 – Aug 29 | 70–110 |
| Scallions | Mar 21 | Apr 11 | Apr 25 | Jun 20 – Jul 18 | 50–70 |
| Scarlet Runner Beans | Mar 7 | May 2 | May 9 | Jul 11 – Aug 15 | 60–80 |
| Shallot | Mar 21 | Apr 11 | Apr 25 | Jul 25 – Sep 12 | 90–120 |
| Shiso | Mar 7 | May 2 | May 9 | Jul 4 – Aug 29 | 50–70 |
| Snap Peas | Mar 7 | May 2 | May 9 | Jul 4 – Aug 29 | 55–70 |
| Snow Peas | Mar 21 | Apr 11 | Apr 25 | Jun 20 – Aug 15 | 50–65 |
| Soybeans | — | May 2 | — | Jul 25 – Sep 19 | 80–120 |
| Spaghetti Squash | Mar 28 | May 2 | May 9 | Aug 8 – Sep 5 | 85–100 |
| Spinach | Mar 21 | Apr 11 | Apr 25 | May 30 – Aug 1 | 35–50 |
| Squash (Summer) | Mar 28 | May 2 | May 9 | Jun 27 – Aug 29 | 45–65 |
| Squash (Winter) | Mar 28 | May 2 | May 9 | Aug 1 – Sep 26 | 80–120 |
| Sunchoke | — | — | May 9 | Aug 29 – Oct 24 | 110–150 |
| Sunflower | Mar 7 | May 2 | May 9 | Jul 18 – Sep 5 | 70–100 |
| Sweet Corn | — | May 2 | — | Jul 4 – Aug 15 | 60–90 |
| Sweet Potatoes | Mar 7 | May 2 | May 9 | Aug 8 – Sep 26 | 90–120 |
| Tatsoi | Mar 21 | Apr 11 | Apr 25 | May 30 – Jul 4 | 35–50 |
| Tomatillo | Mar 7 | May 2 | May 9 | Jul 11 – Sep 19 | 60–85 |
| Tomatoes | Mar 7 | May 2 | May 9 | Jul 11 – Sep 19 | 60–85 |
| Turnip | — | Apr 11 | — | May 23 – Jun 27 | 40–60 |
| Watercress | Mar 21 | Apr 11 | Apr 25 | Jun 6 – Jul 11 | 40–60 |
| Watermelon | Mar 28 | May 2 | May 9 | Jul 18 – Sep 5 | 70–100 |
| Wax Beans | — | May 2 | — | Jun 27 – Aug 22 | 50–65 |
| Winter Melon | Mar 7 | May 2 | May 9 | Aug 8 – Sep 26 | 90–120 |
| Yard Long Beans | Mar 7 | May 2 | May 9 | Jul 4 – Aug 15 | 55–80 |
| Zucchini | Mar 28 | May 2 | May 9 | Jun 27 – Aug 22 | 45–60 |
🍓 Fruits to Grow in Lewis County
31 fruits that grow well in Zone 7b with planting dates for Lewis County.
Show all 31 fruits with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Alpine Strawberries | — | — | May 16 | Aug 15 – Nov 28 | 90–180 |
| Aronia | — | — | May 16 | — | 730–1095 |
| Blackberries | — | — | May 16 | — | 365–730 |
| Blueberries | — | — | May 16 | — | 730–1095 |
| Boysenberries | — | — | May 16 | — | 365–730 |
| Cantaloupe | — | — | May 16 | Jul 25 – Aug 29 | 70–90 |
| Che Fruit | — | — | May 16 | — | 1095–1825 |
| Cranberries | — | — | May 16 | — | 730–1095 |
| Currants | — | — | May 16 | — | 730–1095 |
| Elderberries | — | — | May 16 | — | 730–1095 |
| Figs | — | — | May 16 | — | 730–1825 |
| Goji Berries | — | — | May 16 | — | 730–1095 |
| Gooseberries | — | — | May 16 | — | 730–1095 |
| Grapes | — | — | May 16 | — | 730–1095 |
| Ground Cherry | — | — | May 16 | Jul 25 – Sep 19 | 65–80 |
| Hardy Kiwi | — | — | May 16 | — | 1095–1825 |
| Haskaps | — | — | May 16 | — | 730–1095 |
| Honeydew | — | — | May 16 | Aug 8 – Sep 19 | 80–110 |
| Jostaberry | — | — | May 16 | — | 730–1095 |
| Kiwi | — | — | May 16 | — | 1095–1825 |
| Lingonberries | — | — | May 16 | — | 730–1095 |
| Loquat | — | — | May 16 | — | 730–1825 |
| Medlar | — | — | May 16 | — | 1095–1825 |
| Mulberries | — | — | May 16 | — | 730–1825 |
| Pawpaw | — | — | May 16 | — | 1095–2555 |
| Persimmon | — | — | May 16 | — | 1095–2555 |
| Pomegranate | — | — | May 16 | — | 730–1095 |
| Quince | — | — | May 16 | — | 1095–1825 |
| Raspberries | — | — | May 16 | — | 365–730 |
| Serviceberries | — | — | May 16 | — | 730–1095 |
| Strawberries | — | — | May 16 | Aug 15 – Dec 26 | 90–365 |
🌿 Herbs to Grow in Lewis County
39 herbs that grow well in Zone 7b with planting dates for Lewis County.
Show all 39 herbs with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Angelica | Mar 21 | Apr 11 | Apr 18 | — | 365–730 |
| Anise | Mar 21 | Apr 11 | Apr 18 | Jul 18 – Oct 3 | 90–120 |
| Basil | Mar 7 | May 2 | May 9 | Jul 4 – Sep 5 | 50–75 |
| Bee Balm | — | — | May 2 | Aug 1 – Oct 17 | 90–120 |
| Borage | Mar 21 | Apr 11 | Apr 18 | Jun 13 – Aug 1 | 50–60 |
| Caraway | Mar 21 | Apr 11 | Apr 18 | — | 365–450 |
| Catnip | — | — | May 2 | Jul 4 – Sep 5 | 60–80 |
| Chamomile | Mar 21 | Apr 11 | Apr 18 | Jun 20 – Aug 29 | 60–90 |
| Chervil | Mar 21 | Apr 11 | Apr 18 | May 30 – Aug 1 | 40–60 |
| Chives | — | — | May 2 | Jul 4 – Sep 12 | 60–90 |
| Cilantro | Mar 21 | Apr 11 | Apr 18 | May 30 – Aug 1 | 40–60 |
| Comfrey | — | — | May 2 | Jul 4 – Sep 12 | 60–90 |
| Cumin | Mar 21 | Apr 11 | Apr 18 | Aug 1 – Oct 3 | 100–120 |
| Dill | Mar 21 | Apr 11 | Apr 18 | May 30 – Aug 1 | 40–60 |
| Echinacea | — | — | May 2 | Sep 5 – Dec 12 | 120–180 |
| Epazote | Mar 7 | May 2 | May 9 | Jun 27 – Aug 22 | 45–60 |
| Fennel (herb) | Mar 21 | Apr 11 | Apr 18 | Jun 20 – Aug 29 | 60–90 |
| Feverfew | — | — | May 2 | Aug 1 – Oct 17 | 90–120 |
| Garlic Chives | — | — | May 2 | Jul 4 – Sep 12 | 60–90 |
| Horehound | — | — | May 2 | Jul 18 – Sep 12 | 75–90 |
| Hyssop | — | — | May 2 | Jul 11 – Sep 12 | 70–90 |
| Lavender | — | — | May 2 | Aug 1 – Dec 12 | 90–200 |
| Lemon Balm | — | — | May 2 | Jul 4 – Aug 22 | 60–70 |
| Lemon Thyme | — | — | May 2 | Jul 11 – Sep 12 | 70–90 |
| Lovage | — | — | May 2 | Jul 11 – Sep 12 | 70–90 |
| Marjoram | — | — | May 2 | Jul 4 – Sep 12 | 60–90 |
| Mint | — | — | May 2 | Jul 4 – Sep 12 | 60–90 |
| Oregano | — | — | May 2 | Jul 4 – Sep 12 | 60–90 |
| Parsley | Mar 21 | Apr 11 | Apr 18 | Jun 20 – Aug 22 | 60–80 |
| Rosemary | — | — | May 2 | Jul 25 – Dec 12 | 80–180 |
| Rue | — | — | May 2 | Jul 11 – Sep 12 | 70–90 |
| Sage | — | — | May 2 | Jul 18 – Sep 12 | 75–90 |
| Savory | — | — | May 2 | Jun 27 – Aug 22 | 50–70 |
| Sorrel | Mar 21 | Apr 11 | Apr 18 | May 30 – Aug 1 | 40–60 |
| Tarragon | — | — | May 2 | Jul 4 – Sep 12 | 60–90 |
| Thai Basil | Mar 7 | May 2 | May 9 | Jul 4 – Sep 5 | 50–75 |
| Thyme | — | — | May 2 | Jul 11 – Sep 12 | 70–90 |
| Valerian | — | — | May 2 | Sep 5 – Dec 12 | 120–180 |
| Yarrow | — | — | May 2 | Aug 1 – Oct 17 | 90–120 |
Monthly Planting Guide for Lewis County
Gardening Guides & Resources
Helpful guides from The Ultimate Homestead to improve your garden in Lewis County.
Frequently Asked Questions
What planting zone is Lewis County, WA?
Lewis County is in USDA Hardiness Zone 7b. 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 Lewis County, WA?
Based on 31 years of NOAA weather station data, the median last spring frost in Lewis County falls around April 25. In 8 out of 10 years, last frost lands between March 24 and June 24 — a 91-day window of variability. Use June 24 as your conservative safe-to-plant date for frost-sensitive crops.
When is the first fall frost in Lewis County, WA?
The median first fall frost in Lewis County arrives around October 24. In cold years it can arrive as early as August 26; in mild years as late as November 21. Harvest or protect frost-sensitive crops — tomatoes, peppers, basil, squash — before this date.
How long is the growing season in Lewis County?
Lewis County has a frost-free growing season of approximately 182 days. This is enough time for most warm-season crops including tomatoes, peppers, and squash with proper timing. Climate records show the growing season is trending shorter by about 6.71 days per decade.
What is the soil like in Lewis County for gardening?
Lewis County has predominantly Silt Loam soil with a pH range of 5.6–6.2 and Well Drained drainage. Most vegetables and herbs grow well with standard composting and seasonal soil amendment.
What is grown commercially in Lewis County?
Lewis County has commercial agriculture that includes Wheat, Apples, Potatoes. These crops reflect the local climate and soil conditions — what succeeds commercially often translates well to home gardens in the same area.
Is Lewis County a good location for home gardening?
Lewis County scores 64/100 (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.
Plan Your Garden with Confidence
Get our free Garden Planner — designed to help Lewis County gardeners in Zone 7b 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.
