Washington County, OR — Planting Guide
Washington County, Oregon gardeners: here's your June plan
Each item below is timed to Washington County, Oregon's frost dates and soil temperatures. Skip nothing, stress about nothing.
-
Begin indoor sowing: basil, peppers, and pole beans
You're about 18 weeks out from your last frost — the perfect window to get these germinating indoors.
-
Pick basil, carrots, and cucumber
Check every 1–2 days. Many of these get tough or go to seed if you wait too long.
July prep starts now
- First harvests: basil, carrots, and cucumber
Washington County is in USDA Zone 8b. The average last spring frost is April 15 and the first fall frost is October 27, giving you a growing season of approximately 195 days.
At an elevation of 352 ft, Washington County receives approximately 47.1 in of rainfall annually. Summer highs average 85°F with winter lows around 42°F. The predominant soil type is Silt Loam.
Based on 31 years of NOAA climate station data, the last frost date here varies by 46 days year to year — ranging from March 23 in warm years to May 8 in cold years. The growing season is trending longer by about 1.46 days per decade. Washington County scores 66/100 (Good) on the Microclimate Index.
🌡️ Zone
8b (15°F to 20°F min)
❄️ Last Frost
April 15
🍂 First Frost
October 27
📅 Growing Season
195 days
⛰️ Elevation
352 ft
🌧️ Annual Rainfall
47.1 in
Monthly Watering Calendar for Washington County
When you'll need to water your garden — based on average monthly rainfall vs. the ~1 inch/week most gardens need.
For new gardeners: Most vegetables want about 1 inch of water per week. Washington County gets 47" a year — months that hit that 1"/week need zero supplemental watering; months that fall short, the table tells you how much to add. Saves you from drowning roots and from drought-stressing plants into bolting.
View detailed monthly data
| Month | Avg Rainfall | Rainy Days | Extra Water Needed | Watering Effort |
|---|---|---|---|---|
| Jan | 7.4 in | 16 days | — | None |
| Feb | 5.7 in | 16 days | — | Low |
| Mar | 4.2 in | 13 days | 0.1 in | Low |
| Apr | 3 in | 13 days | 1.3 in | Moderate |
| May | 2.8 in | 10 days | 1.5 in | Moderate |
| Jun | 1.7 in | 6 days | 2.6 in | High |
| Jul | 0.6 in | 2 days | 3.7 in | Critical |
| Aug | 0.9 in | 3 days | 3.4 in | Critical |
| Sep | 1.9 in | 5 days | 2.4 in | High |
| Oct | 3.5 in | 11 days | 0.8 in | Moderate |
| Nov | 7.3 in | 14 days | — | Low |
| Dec | 8 in | 16 days | — | None |
Annual total: 47 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.
Washington County Soil Profile
Soil Type
Silt Loam
Soil pH
5.8-6.4
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) | May 8 | Nov 20 | 196 days |
| Cautious | Apr 23 | Nov 6 | 197 days |
| Average year | Apr 15 | Oct 27 | 195 days |
| Optimistic | Apr 8 | Oct 18 | 193 days |
| Aggressive (risky) | Mar 23 | Oct 9 | 200 days |
Not very — frost dates can vary by ±46 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 1.5 days per decade). Spring is arriving earlier than it used to. Good news for gardeners.
Gardening Difficulty Score
Washington County offers good growing conditions. A little planning around frost dates goes a long way.
Local Gardening Help in Washington 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 Washington County's climate and soil.
County Extension Office
Washington County Oregon State University Extension Extension Office
Phone: 541-737-2713
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 Washington County
Finding local nurseries & garden centers in Washington County
Why Buy Local
Local nurseries carry plants that are proven to grow in your area. Staff can give you advice specific to Washington 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 Washington County OR" or "garden center Washington 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 Washington County OR" or check your extension office and local parks department. Facebook groups like "Washington County Gardeners" or "Oregon 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 in Washington County
Monthly daylight hours and peak sun — critical for onion varieties, photoperiod-sensitive plants, and solar garden planning.
Why this matters: Plants use day length as their seasonal clock. Some crops flower when days lengthen (most flowers), some when days shorten (chrysanthemums, soybeans). Washington County's curve is the timing layer beneath everything you grow.
Longest Day
15.5 hours
Summer solstice daylight
Shortest Day
8.5 hours
Winter solstice daylight
Peak Sun Hours
10.3 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 | 8.9 hr | 2.3 hr | Short day |
| February | 10.1 hr | 3 hr | Short day |
| March | 11.6 hr | 4.3 hr | Short day |
| April | 13.3 hr | 5.8 hr | Neutral |
| May | 14.7 hr | 7.2 hr | Long day |
| June | 15.5 hr | 8.1 hr | Long day |
| July | 15.2 hr | 10.3 hr | Long day |
| August | 13.9 hr | 9.6 hr | Neutral |
| September | 12.3 hr | 7.3 hr | Neutral |
| October | 10.7 hr | 4.2 hr | Short day |
| November | 9.2 hr | 2.3 hr | Short day |
| December | 8.5 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 in Washington County
Monthly soil temps tell you when to plant warm-season crops, and when your compost pile is actively working.
Quick context: Soil heats slower than air in spring and cools slower in fall. That's why "warm" April air doesn't mean "plant tomatoes" — soil still trails by weeks. Washington County's monthly soil curve makes the lag visible.
Plant Warm Crops When
Soil reaches 60°F+
Soil warm enough from May through Nov.
Best Month to Compost
May
Microbial activity peaks when soil is warm.
Active Composting
10 months
Nearly year-round composting.
View detailed monthly data
| Month | Soil 4" Deep | Soil 8" Deep | Compost Activity | Time to Finish |
|---|---|---|---|---|
| Jan | 45°F | 50°F | 🐢 Slow | ~24 weeks |
| Feb | 47°F | 51°F | 🐢 Slow | ~24 weeks |
| Mar | 50°F | 52°F | ♻️ Active | ~14 weeks |
| Apr | 60°F | 61°F | ♻️ Active | ~14 weeks |
| May | 72°F | 69°F | 🔥 Peak | ~8 weeks |
| Jun | 81°F | 76°F | 🔥 Peak | ~8 weeks |
| Jul | 87°F | 83°F | 🔥 Peak | ~8 weeks |
| Aug | 91°F | 86°F | 🔥 Peak | ~8 weeks |
| Sep | 85°F | 83°F | 🔥 Peak | ~8 weeks |
| Oct | 72°F | 76°F | 🔥 Peak | ~8 weeks |
| Nov | 60°F | 63°F | ♻️ Active | ~14 weeks |
| Dec | 51°F | 55°F | ♻️ Active | ~14 weeks |
Highlighted rows = soil 60°F+ (safe for warm-season transplants). Compost finishes fastest during peak activity months.
Pest & Disease Pressure in Washington County
Computed from local climate patterns — warmer, humid conditions increase pest generations and fungal disease risk.
Why this matters: In Washington County's climate, pest pressure shapes which crops are easy and which are heartbreak. Tomatoes are easy in dry mountain air, hard in humid coast — same plant, completely different gardening experience.
Insect Pest Pressure
High — expect multiple pest generations. Preventative measures essential.
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 | High | Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov |
| Squash vine borers | High | May, Jun, Jul |
| Stink bugs | High | Apr, May, Jun, Jul, Aug, Sep, Oct |
| Whiteflies | Moderate | May, Jun, Jul, Aug, Sep, Oct |
| Spider mites | Moderate | Jun, Jul, Aug, Sep |
| Fire ants | Moderate | Mar, Apr, May, Jun, Jul, Aug, Sep, Oct |
Organic pest management tips
- Install physical barriers: floating row covers, copper tape for slugs, mesh netting
- Apply Bt (Bacillus thuringiensis) for caterpillar control — safe for beneficial insects
- Use kaolin clay spray to deter a wide range of insects on fruiting crops
- Release beneficial insects: ladybugs for aphids, parasitic wasps for caterpillars
- Apply neem oil weekly during high-pressure months
- Mulch heavily (3-4 inches) to reduce soil-borne disease splash
Cover Crops for Washington County
Cover crops protect bare soil, fix nitrogen, suppress weeds, and improve soil structure — with planting dates calibrated for your area.
Quick context: Cover crops do four things at once: fix nitrogen (legumes), suppress weeds (any), prevent erosion, and add organic matter when chopped down. Washington County's seasonal pattern determines which species fit which gap.
Spring Cover Crops (4 options) — Build soil before the main growing season
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Buckwheat | Apr 21 | Aug 18 | — | Rapid growth, attracts pollinators, suppresses weeds |
| Cowpeas (southern peas) | Apr 19 | Sep 1 | ✓ Yes | Excellent nitrogen fixer for warm climates, edible |
| Sorghum-sudan grass | Apr 23 | Aug 18 | — | Massive biomass, breaks compaction, suppresses nematodes |
| White clover | Mar 21 | Sep 1 | ✓ 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 | Apr 30 | Sep 29 | — | 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 21 | Mar 25 | ✓ Yes | Fixes nitrogen, good for heavy clay soils |
| Crimson clover | Aug 27 | Mar 25 | ✓ Yes | Fixes nitrogen, attracts pollinators in spring |
| Daikon radish | Sep 9 | Apr 1 | — | Deep taproot breaks compaction, excellent for clay soils |
| Hairy vetch | Aug 15 | Mar 25 | ✓ Yes | Excellent nitrogen fixer, good for depleted soils |
| Oats | Sep 14 | Mar 25 | — | Quick biomass, winterkills in cold zones — no spring tillage needed |
| Winter rye | Aug 2 | Mar 25 | — | Suppresses weeds, prevents erosion, breaks up compacted soil |
| Winter wheat | Jul 19 | Apr 1 | — | Erosion control, weed suppression, good biomass |
Wind & Microclimate in Washington County
For new gardeners: Wind dries soil, knocks over young transplants, and disrupts pollination for bees and butterflies. Washington County averages 8.6 mph — above 10 mph means windbreaks (shrubs, fences, taller crops to windward), staked tomatoes from day one, and an extra round of watering during dry windy spells. Lower wind = lower water bills and fewer broken stems.
Wind dries soil, stresses plants, and affects frost patterns. Understanding your exposure helps with garden placement.
Seasonal Wind Speed
Spring: 13 mph Summer: 9 mph
Fall: 11 mph Winter: 14 mph
Prevailing wind: SW. Moderate wind — consider a temporary windbreak for young seedlings.
Windbreak Benefit
6.8/10
Moderately beneficial — a simple fence or trellis can protect delicate crops from wind stress.
Frost Pocket Risk
Low
Relatively flat terrain (290 ft range). Frost pocket risk is minimal — garden placement is flexible.
Rainwater Harvesting in Washington County
How much water you can collect, when to collect it, and what size system you need for your garden.
Quick context: The first inch of rain washes the roof clean — a first-flush diverter sends it to waste before the barrel fills. Worth the extra $20 for cleaner garden water. Washington County gets 47" annually, so you'll fill and flush many times per year.
Annual Collection
23,424 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 2,000 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
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 47.0 inches of rain per year
- A 1,000 sq ft roof can collect roughly 23,424 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 Washington County
Soil Type
Silt Loam
Soil pH 5.8–6.4 · Well Drained drainage
Good candidate for raised beds to maximise drainage and extend the season.
Watering Needs
Drought stress: 3.5/10
Low-to-moderate drought stress. Plan to water 1–2 times per week during peak summer. (47.1 in. annual rainfall)
Season Tips
195-day frost-free season
Plenty of time for warm-season crops. Start heat-lovers indoors 6–8 weeks before last frost to maximise your harvest window.
Your Free Printable Garden Planner
Plan every bed, every planting, every harvest — in one place. This 22-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
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 Washington County
114 vegetables that grow well in Zone 8b with planting dates for Washington County.
Show all 114 vegetables with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Harvest | Days to Maturity |
|---|---|---|---|---|---|---|
| Acorn Squash | Mar 18 | Apr 22 | Apr 29 | — | Jul 22 – Aug 26 | 80–100 |
| Amaranth | Feb 25 | Apr 22 | Apr 29 | — | Jul 29 – Sep 16 | 90–120 |
| Artichoke | — | — | Apr 29 | — | Sep 2 – Nov 11 | 120–180 |
| Arugula | Mar 11 | Apr 1 | Apr 15 | Aug 18 | May 20 – Jul 22 | 30–50 |
| Asparagus | — | — | Apr 29 | — | — | 730–1095 |
| Beets | — | Apr 1 | — | Aug 18 | May 27 – Jun 24 | 50–70 |
| Belgian Endive | Mar 11 | Apr 1 | Apr 15 | Aug 18 | Aug 5 – Sep 30 | 110–150 |
| Bitter Melon | Feb 25 | Apr 22 | Apr 29 | — | Jul 1 – Aug 12 | 60–90 |
| Black Beans | — | Apr 22 | — | — | Jul 22 – Sep 9 | 90–120 |
| Bok Choy | Mar 11 | Apr 1 | Apr 15 | Aug 18 | May 27 – Jul 1 | 40–60 |
| Broccoli | Mar 11 | Apr 1 | Apr 15 | Aug 18 | Jun 17 – Jul 29 | 60–90 |
| Broccoli Rabe | Mar 11 | Apr 1 | Apr 15 | Aug 18 | May 27 – Jul 1 | 40–60 |
| Brussels Sprouts | Mar 11 | Apr 1 | Apr 15 | Aug 18 | Jul 15 – Sep 9 | 90–130 |
| Butternut Squash | Mar 18 | Apr 22 | Apr 29 | — | Jul 29 – Sep 2 | 85–110 |
| Cabbage | Mar 11 | Apr 1 | Apr 15 | Aug 18 | Jun 17 – Aug 12 | 60–100 |
| Calabash | Feb 25 | Apr 22 | Apr 29 | — | Jul 22 – Sep 16 | 80–120 |
| Cardoon | — | — | Apr 29 | — | Sep 2 – Oct 14 | 120–150 |
| Carrots | — | Apr 1 | — | Aug 18 | Jun 3 – Jul 8 | 60–80 |
| Cauliflower | Mar 11 | Apr 1 | Apr 15 | Aug 18 | Jun 10 – Aug 12 | 55–100 |
| Celeriac | Mar 11 | Apr 1 | Apr 15 | Aug 18 | Jul 29 – Sep 2 | 100–120 |
| Celery | Mar 11 | Apr 1 | Apr 15 | Aug 18 | Jul 8 – Sep 2 | 80–120 |
| Celtuce | Mar 11 | Apr 1 | Apr 15 | Aug 18 | Jun 17 – Jul 29 | 60–90 |
| Chard | Mar 11 | Apr 1 | Apr 15 | Aug 18 | Jun 10 – Jul 29 | 50–60 |
| Chayote | Feb 25 | Apr 22 | Apr 29 | — | Sep 2 – Nov 11 | 120–180 |
| Chickpeas | Mar 11 | Apr 1 | Apr 15 | Aug 18 | Jul 8 – Aug 19 | 80–110 |
| Chicory | Mar 11 | Apr 1 | Apr 15 | Aug 18 | Jun 17 – Jul 29 | 60–85 |
| Chinese Cabbage | Mar 11 | Apr 1 | Apr 15 | Aug 18 | Jun 10 – Jul 8 | 50–70 |
| Christmas Lima Beans | Feb 25 | Apr 22 | Apr 29 | — | Jul 22 – Aug 26 | 80–100 |
| Collard Greens | Mar 11 | Apr 1 | Apr 15 | Aug 18 | Jun 10 – Aug 12 | 55–75 |
| Corn | — | Apr 22 | — | — | Jun 24 – Aug 19 | 60–100 |
| Cowpeas | — | Apr 22 | — | — | Jun 24 – Aug 5 | 60–90 |
| Cress | Mar 11 | Apr 1 | Apr 15 | Aug 18 | Apr 29 – May 20 | 14–21 |
| Crookneck Squash | Mar 18 | Apr 22 | Apr 29 | — | Jun 17 – Jul 15 | 45–60 |
| Crosne | — | Apr 1 | — | Aug 18 | Sep 2 – Nov 4 | 150–200 |
| Cucumber | Mar 18 | Apr 22 | Apr 29 | — | Jun 24 – Aug 19 | 50–70 |
| Daikon | — | Apr 1 | — | Aug 18 | May 27 – Jun 24 | 50–70 |
| Delicata Squash | Mar 18 | Apr 22 | Apr 29 | — | Jul 22 – Aug 26 | 80–100 |
| Edamame | — | Apr 22 | — | — | Jul 8 – Aug 19 | 75–100 |
| Eggplant | Feb 11 | Apr 22 | Apr 29 | — | Jul 8 – Sep 9 | 65–85 |
| Endive | Mar 11 | Apr 1 | Apr 15 | Aug 18 | Jun 3 – Jul 8 | 45–65 |
| Escarole | Mar 11 | Apr 1 | Apr 15 | Aug 18 | Jun 10 – Jul 8 | 50–70 |
| Fava Beans | Mar 11 | Apr 1 | Apr 15 | Aug 18 | Jul 1 – Aug 12 | 75–100 |
| Fennel | Feb 25 | Apr 22 | Apr 29 | — | Jul 1 – Aug 12 | 60–90 |
| Garlic | — | — | — | Sep 15 | Dec 15 – Jun 1 | 90–240 |
| Ginger | Feb 25 | Apr 22 | Apr 29 | — | Dec 30 – Jan 13 | 240–300 |
| Green Beans | — | Apr 22 | — | — | Jun 17 – Aug 12 | 50–65 |
| Horseradish | — | — | Apr 29 | — | Sep 2 – Nov 11 | 120–180 |
| Hot Peppers | Feb 11 | Apr 22 | Apr 29 | — | Jul 8 – Oct 14 | 70–120 |
| Hubbard Squash | Mar 18 | Apr 22 | Apr 29 | — | Aug 12 – Sep 16 | 100–120 |
| Jicama | Feb 25 | Apr 22 | Apr 29 | — | Sep 2 – Nov 11 | 120–180 |
| Kabocha | Mar 18 | Apr 22 | Apr 29 | — | Jul 29 – Aug 26 | 85–100 |
| Kai Lan | Mar 11 | Apr 1 | Apr 15 | Aug 18 | Jun 3 – Jul 1 | 45–60 |
| Kale | Mar 11 | Apr 1 | Apr 15 | Aug 18 | Jun 10 – Aug 5 | 50–70 |
| Kidney Beans | — | Apr 22 | — | — | Jul 22 – Aug 26 | 85–110 |
| Kohlrabi | Mar 11 | Apr 1 | Apr 15 | Aug 18 | Jun 3 – Jul 8 | 45–65 |
| Komatsuna | Mar 11 | Apr 1 | Apr 15 | Aug 18 | May 20 – Jun 24 | 35–50 |
| Leeks | Mar 11 | Apr 1 | Apr 15 | Aug 18 | Jul 15 – Sep 30 | 90–150 |
| Lentils | Mar 11 | Apr 1 | Apr 15 | Aug 18 | Jul 8 – Aug 19 | 80–110 |
| Lettuce | Mar 11 | Apr 1 | Apr 15 | Aug 18 | May 20 – Jul 29 | 30–60 |
| Lima Beans | — | Apr 22 | — | — | Jun 24 – Aug 5 | 60–90 |
| Loofah | Feb 25 | Apr 22 | Apr 29 | — | Aug 12 – Oct 14 | 100–150 |
| Luffa | Feb 25 | Apr 22 | Apr 29 | — | Jul 29 – Oct 14 | 90–150 |
| Mache | Mar 11 | Apr 1 | Apr 15 | Aug 18 | May 27 – Jul 1 | 40–60 |
| Malabar Spinach | Feb 25 | Apr 22 | Apr 29 | — | Jun 24 – Jul 22 | 55–70 |
| Melon | Mar 18 | Apr 22 | Apr 29 | — | Jul 8 – Aug 26 | 70–100 |
| Microgreens | Mar 11 | Apr 1 | Apr 15 | Aug 18 | Apr 22 – May 20 | 7–21 |
| Mitsuba | Mar 11 | Apr 1 | Apr 8 | Aug 18 | Jun 3 – Jul 29 | 50–70 |
| Mizuna | Mar 11 | Apr 1 | Apr 15 | Aug 18 | May 20 – Jun 17 | 30–45 |
| Mustard Greens | Mar 11 | Apr 1 | Apr 15 | Aug 18 | May 20 – Jul 22 | 30–50 |
| Napa Cabbage | Mar 11 | Apr 1 | Apr 15 | Aug 18 | Jun 10 – Jul 15 | 55–75 |
| New Zealand Spinach | Feb 25 | Apr 22 | Apr 29 | — | Jun 24 – Jul 22 | 55–70 |
| Okra | Feb 25 | Apr 22 | Apr 29 | — | Jun 24 – Aug 19 | 50–65 |
| Onion | Mar 11 | Apr 1 | Apr 15 | Aug 18 | Jul 15 – Sep 2 | 90–120 |
| Pac Choi | Mar 11 | Apr 1 | Apr 15 | Aug 18 | May 27 – Jun 24 | 40–55 |
| Parsnip | — | Apr 1 | — | Aug 18 | Jul 15 – Aug 26 | 100–130 |
| Patty Pan Squash | Mar 18 | Apr 22 | Apr 29 | — | Jun 17 – Jul 15 | 45–60 |
| Peas | Mar 11 | Apr 1 | Apr 15 | Aug 18 | Jun 10 – Aug 5 | 55–70 |
| Peppers | Feb 11 | Apr 22 | Apr 29 | — | Jul 1 – Sep 9 | 60–90 |
| Pole Beans | Feb 25 | Apr 22 | Apr 29 | — | Jun 24 – Aug 19 | 55–70 |
| Potatoes | Feb 25 | Apr 22 | Apr 29 | — | Jul 8 – Sep 16 | 70–120 |
| Pumpkin | Mar 18 | Apr 22 | Apr 29 | — | Jul 29 – Sep 16 | 85–120 |
| Purslane | Mar 11 | Apr 1 | Apr 15 | Aug 18 | May 27 – Jul 1 | 40–60 |
| Radicchio | Mar 11 | Apr 1 | Apr 15 | Aug 18 | Jun 17 – Jul 22 | 60–80 |
| Radish | — | Apr 1 | — | Aug 18 | Apr 29 – May 20 | 22–35 |
| Rhubarb | — | — | May 6 | — | — | 365–730 |
| Romanesco | Mar 11 | Apr 1 | Apr 15 | Aug 18 | Jul 1 – Aug 12 | 75–100 |
| Rutabaga | — | Apr 1 | — | Aug 18 | Jun 24 – Jul 29 | 80–100 |
| Salsify | — | Apr 1 | — | Aug 18 | Jul 15 – Aug 26 | 100–130 |
| Savoy Cabbage | Mar 11 | Apr 1 | Apr 15 | Aug 18 | Jun 24 – Aug 19 | 70–110 |
| Scallions | Mar 11 | Apr 1 | Apr 15 | Aug 18 | Jun 10 – Jul 8 | 50–70 |
| Scarlet Runner Beans | Feb 25 | Apr 22 | Apr 29 | — | Jul 1 – Aug 5 | 60–80 |
| Shallot | Mar 11 | Apr 1 | Apr 15 | Aug 18 | Jul 15 – Sep 2 | 90–120 |
| Shiso | Feb 25 | Apr 22 | Apr 29 | — | Jun 24 – Aug 19 | 50–70 |
| Snap Peas | Feb 25 | Apr 22 | Apr 29 | — | Jun 24 – Aug 19 | 55–70 |
| Snow Peas | Mar 11 | Apr 1 | Apr 15 | Aug 18 | Jun 10 – Aug 5 | 50–65 |
| Soybeans | — | Apr 22 | — | — | Jul 15 – Sep 9 | 80–120 |
| Spaghetti Squash | Mar 18 | Apr 22 | Apr 29 | — | Jul 29 – Aug 26 | 85–100 |
| Spinach | Mar 11 | Apr 1 | Apr 15 | Aug 18 | May 20 – Jul 22 | 35–50 |
| Squash (Summer) | Mar 18 | Apr 22 | Apr 29 | — | Jun 17 – Aug 19 | 45–65 |
| Squash (Winter) | Mar 18 | Apr 22 | Apr 29 | — | Jul 22 – Sep 16 | 80–120 |
| Sunchoke | — | — | Apr 29 | — | Aug 19 – Oct 14 | 110–150 |
| Sweet Corn | — | Apr 22 | — | — | Jun 24 – Aug 5 | 60–90 |
| Sweet Potatoes | Feb 25 | Apr 22 | Apr 29 | — | Jul 29 – Sep 16 | 90–120 |
| Tatsoi | Mar 11 | Apr 1 | Apr 15 | Aug 18 | May 20 – Jun 24 | 35–50 |
| Tomatillo | Feb 25 | Apr 22 | Apr 29 | — | Jul 1 – Sep 9 | 60–85 |
| Tomatoes | Feb 25 | Apr 22 | Apr 29 | — | Jul 1 – Sep 9 | 60–85 |
| Turmeric | Feb 25 | Apr 22 | Apr 29 | — | Dec 30 – Jan 13 | 240–300 |
| Turnip | — | Apr 1 | — | Aug 18 | May 13 – Jun 17 | 40–60 |
| Watercress | Mar 11 | Apr 1 | Apr 15 | Aug 18 | May 27 – Jul 1 | 40–60 |
| Watermelon | Mar 18 | Apr 22 | Apr 29 | — | Jul 8 – Aug 26 | 70–100 |
| Wax Beans | — | Apr 22 | — | — | Jun 17 – Aug 12 | 50–65 |
| Winter Melon | Feb 25 | Apr 22 | Apr 29 | — | Jul 29 – Sep 16 | 90–120 |
| Yard Long Beans | Feb 25 | Apr 22 | Apr 29 | — | Jun 24 – Aug 5 | 55–80 |
| Zucchini | Mar 18 | Apr 22 | Apr 29 | — | Jun 17 – Aug 12 | 45–60 |
🍓 Fruits to Grow in Washington County
27 fruits that grow well in Zone 8b with planting dates for Washington County.
Show all 27 fruits with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Harvest | Days to Maturity |
|---|---|---|---|---|---|---|
| Alpine Strawberries | — | — | May 6 | — | Aug 5 – Nov 18 | 90–180 |
| Aronia | — | — | May 6 | — | — | 730–1095 |
| Blackberries | — | — | May 6 | — | — | 365–730 |
| Blueberries | — | — | May 6 | — | — | 730–1095 |
| Boysenberries | — | — | May 6 | — | — | 365–730 |
| Cantaloupe | — | — | May 6 | — | Jul 15 – Aug 19 | 70–90 |
| Che Fruit | — | — | May 6 | — | — | 1095–1825 |
| Elderberries | — | — | May 6 | — | — | 730–1095 |
| Figs | — | — | May 6 | — | — | 730–1825 |
| Goji Berries | — | — | May 6 | — | — | 730–1095 |
| Gooseberries | — | — | May 6 | — | — | 730–1095 |
| Grapes | — | — | May 6 | — | — | 730–1095 |
| Ground Cherry | — | — | May 6 | — | Jul 15 – Sep 9 | 65–80 |
| Hardy Kiwi | — | — | May 6 | — | — | 1095–1825 |
| Honeydew | — | — | May 6 | — | Jul 29 – Sep 9 | 80–110 |
| Jostaberry | — | — | May 6 | — | — | 730–1095 |
| Kiwi | — | — | May 6 | — | — | 1095–1825 |
| Loquat | — | — | May 6 | — | — | 730–1825 |
| Medlar | — | — | May 6 | — | — | 1095–1825 |
| Mulberries | — | — | May 6 | — | — | 730–1825 |
| Pawpaw | — | — | May 6 | — | — | 1095–2555 |
| Persimmon | — | — | May 6 | — | — | 1095–2555 |
| Pomegranate | — | — | May 6 | — | — | 730–1095 |
| Quince | — | — | May 6 | — | — | 1095–1825 |
| Raspberries | — | — | May 6 | — | — | 365–730 |
| Serviceberries | — | — | May 6 | — | — | 730–1095 |
| Strawberries | — | — | May 6 | — | Aug 5 – Jan 20 | 90–365 |
🌿 Herbs to Grow in Washington County
39 herbs that grow well in Zone 8b with planting dates for Washington County.
Show all 39 herbs with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Harvest | Days to Maturity |
|---|---|---|---|---|---|---|
| Angelica | Mar 11 | Apr 1 | Apr 8 | Aug 18 | — | 365–730 |
| Anise | Mar 11 | Apr 1 | Apr 8 | Aug 18 | Jul 8 – Sep 23 | 90–120 |
| Basil | Feb 25 | Apr 22 | Apr 29 | — | Jun 24 – Aug 26 | 50–75 |
| Bee Balm | — | — | Apr 22 | — | Jul 22 – Oct 7 | 90–120 |
| Borage | Mar 11 | Apr 1 | Apr 8 | Aug 18 | Jun 3 – Jul 22 | 50–60 |
| Caraway | Mar 11 | Apr 1 | Apr 8 | Aug 18 | — | 365–450 |
| Catnip | — | — | Apr 22 | — | Jun 24 – Aug 26 | 60–80 |
| Chamomile | Mar 11 | Apr 1 | Apr 8 | Aug 18 | Jun 10 – Aug 19 | 60–90 |
| Chervil | Mar 11 | Apr 1 | Apr 8 | Aug 18 | May 20 – Jul 22 | 40–60 |
| Chives | — | — | Apr 22 | — | Jun 24 – Sep 2 | 60–90 |
| Cilantro | Mar 11 | Apr 1 | Apr 8 | Aug 18 | May 20 – Jul 22 | 40–60 |
| Comfrey | — | — | Apr 22 | — | Jun 24 – Sep 2 | 60–90 |
| Cumin | Mar 11 | Apr 1 | Apr 8 | Aug 18 | Jul 22 – Sep 23 | 100–120 |
| Dill | Mar 11 | Apr 1 | Apr 8 | Aug 18 | May 20 – Jul 22 | 40–60 |
| Epazote | Feb 25 | Apr 22 | Apr 29 | — | Jun 17 – Aug 12 | 45–60 |
| Fennel (herb) | Mar 11 | Apr 1 | Apr 8 | Aug 18 | Jun 10 – Aug 19 | 60–90 |
| Feverfew | — | — | Apr 22 | — | Jul 22 – Oct 7 | 90–120 |
| Garlic Chives | — | — | Apr 22 | — | Jun 24 – Sep 2 | 60–90 |
| Horehound | — | — | Apr 22 | — | Jul 8 – Sep 2 | 75–90 |
| Hyssop | — | — | Apr 22 | — | Jul 1 – Sep 2 | 70–90 |
| Lemon Balm | — | — | Apr 22 | — | Jun 24 – Aug 12 | 60–70 |
| Lemon Thyme | — | — | Apr 22 | — | Jul 1 – Sep 2 | 70–90 |
| Lemon Verbena | Feb 25 | Apr 22 | Apr 29 | — | Jul 1 – Sep 9 | 60–90 |
| Lemongrass | Feb 25 | Apr 22 | Apr 29 | — | Jul 15 – Oct 14 | 75–120 |
| Lovage | — | — | Apr 22 | — | Jul 1 – Sep 2 | 70–90 |
| Marjoram | — | — | Apr 22 | — | Jun 24 – Sep 2 | 60–90 |
| Mint | — | — | Apr 22 | — | Jun 24 – Sep 2 | 60–90 |
| Oregano | — | — | Apr 22 | — | Jun 24 – Sep 2 | 60–90 |
| Parsley | Mar 11 | Apr 1 | Apr 8 | Aug 18 | Jun 10 – Aug 12 | 60–80 |
| Rosemary | — | — | Apr 22 | — | Jul 15 – Dec 2 | 80–180 |
| Rue | — | — | Apr 22 | — | Jul 1 – Sep 2 | 70–90 |
| Sage | — | — | Apr 22 | — | Jul 8 – Sep 2 | 75–90 |
| Savory | — | — | Apr 22 | — | Jun 17 – Aug 12 | 50–70 |
| Sorrel | Mar 11 | Apr 1 | Apr 8 | Aug 18 | May 20 – Jul 22 | 40–60 |
| Stevia | Feb 25 | Apr 22 | Apr 29 | — | Jul 1 – Sep 9 | 60–90 |
| Tarragon | — | — | Apr 22 | — | Jun 24 – Sep 2 | 60–90 |
| Thai Basil | Feb 25 | Apr 22 | Apr 29 | — | Jun 24 – Aug 26 | 50–75 |
| Thyme | — | — | Apr 22 | — | Jul 1 – Sep 2 | 70–90 |
| Valerian | — | — | Apr 22 | — | Aug 26 – Dec 2 | 120–180 |
🌸 Flowers to Grow in Washington County
54 flowers that grow well in Zone 8b with planting dates for Washington County.
Show all 54 flowers with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Bloom | Days to Maturity |
|---|---|---|---|---|---|---|
| Ageratum | Mar 4 | Apr 1 | Apr 1 | — | May 27 – Oct 28 | 60–75 |
| Alliums | — | — | — | Sep 29 | Oct 27 – Nov 17 | 28–42 |
| Anemones | — | — | — | Sep 1 | Sep 8 – Oct 6 | 90–120 |
| Astilbe | Feb 18 | — | Apr 15 | — | Jun 24 – Aug 12 | 70–100 |
| Bachelor's Button | — | Feb 25 | Mar 25 | Sep 1 | May 27 – Sep 23 | 60–90 |
| Begonias | Feb 4 | — | Apr 1 | — | Jun 10 – Nov 11 | 70–90 |
| Black-eyed Susan | Feb 18 | Apr 1 | Apr 15 | — | Jun 24 – Nov 18 | 60–80 |
| Bleeding Hearts | Feb 18 | — | Apr 15 | — | Jun 3 – Jul 1 | 60–90 |
| Calendula | — | Feb 25 | Mar 25 | Aug 18 | May 13 – Oct 7 | 50–70 |
| California Poppy | — | — | — | Aug 18 | Oct 27 – Feb 16 | 60–90 |
| Celosia | Mar 18 | Apr 1 | Apr 1 | — | Jun 3 – Nov 11 | 60–90 |
| Columbine | Feb 18 | Apr 15 | Apr 15 | — | Jun 3 – Jul 1 | 70–100 |
| Coreopsis | Feb 18 | Apr 1 | Apr 15 | — | Jun 17 – Nov 11 | 60–80 |
| Cosmos | Mar 18 | Mar 25 | Mar 25 | — | Jun 3 – Nov 4 | 60–90 |
| Crocus | — | — | — | Sep 29 | Sep 1 – Sep 22 | 10–20 |
| Daffodils | — | — | — | Sep 29 | Sep 8 – Oct 6 | 20–40 |
| Dahlias | Mar 25 | Apr 15 | Apr 15 | — | Jun 24 – Dec 9 | 70–120 |
| Daylily | Feb 18 | — | Apr 15 | — | Jun 24 – Nov 25 | 60–90 |
| Dianthus | Feb 18 | Feb 25 | Mar 4 | — | Apr 22 – Jul 1 | 60–80 |
| Echinacea (Purple Coneflower) | Feb 18 | Apr 15 | Apr 15 | — | Jun 24 – Nov 11 | 70–90 |
| Foxglove | Feb 18 | Apr 8 | Apr 8 | — | May 27 – Jun 24 | 80–120 |
| Freesia | — | — | — | Sep 15 | Oct 6 – Nov 10 | 84–112 |
| Gaillardia (Blanket Flower) | Mar 4 | Apr 1 | Apr 1 | — | Jun 10 – Nov 25 | 70–100 |
| Geraniums | Feb 4 | — | Apr 1 | — | Jun 10 – Nov 11 | 70–100 |
| Gladiolus | — | Apr 15 | Apr 15 | — | Jun 24 – Dec 9 | 70–100 |
| Hostas | Feb 11 | — | Apr 15 | — | Jun 24 – Oct 28 | 60–90 |
| Hyacinths | — | — | — | Sep 29 | Sep 22 – Oct 13 | 14–28 |
| Hydrangeas | Feb 11 | — | Apr 8 | — | Jun 17 – Oct 21 | 90–150 |
| Impatiens | Feb 18 | — | Apr 8 | — | Jun 17 – Nov 18 | 60–75 |
| Irises | — | Division | Apr 8 | — | May 27 – Jul 1 | 60–100 |
| Larkspur | — | — | — | Aug 18 | Oct 27 – Feb 16 | 60–90 |
| Lavender | Feb 18 | — | Apr 15 | — | Jun 24 – Sep 30 | 90–120 |
| Lilies | — | Division | Apr 8 | — | Jun 17 – Oct 7 | 70–120 |
| Lobelia | Feb 18 | — | Mar 4 | — | Apr 29 – Jun 10 | 70–80 |
| Lupine | Feb 18 | Apr 15 | Apr 15 | — | Jun 3 – Jul 1 | 75–100 |
| Marigolds | Mar 11 | Apr 1 | Apr 1 | — | May 27 – Oct 14 | 50–70 |
| Nasturtium | Mar 18 | Apr 1 | Apr 1 | — | May 27 – Nov 11 | 55–65 |
| Pansy | Feb 4 | — | Mar 25 | Aug 18 | May 20 – Sep 9 | 70–90 |
| Peonies | — | Division | Apr 15 | — | Jun 10 – Jul 8 | 90–120 |
| Petunia | Feb 18 | — | Apr 8 | — | Jun 17 – Nov 4 | 70–90 |
| Phlox | Feb 18 | Apr 15 | Apr 15 | — | Jun 24 – Sep 2 | 80–110 |
| Portulaca | Mar 18 | Apr 1 | Apr 1 | — | May 20 – Oct 28 | 50–70 |
| Ranunculus | — | — | — | Sep 1 | Sep 15 – Oct 13 | 90–120 |
| Roses | Feb 11 | — | Apr 8 | — | Jun 17 – Nov 18 | 90–180 |
| Salvia | Feb 18 | — | Apr 1 | — | Jun 10 – Nov 11 | 70–90 |
| Sedum (Stonecrop) | Feb 18 | — | Apr 15 | — | Aug 5 – Oct 28 | 60–90 |
| Snapdragon | Feb 4 | Mar 4 | Mar 25 | Aug 18 | Jun 3 – Oct 7 | 70–100 |
| Sunflower | Mar 25 | Apr 1 | Apr 1 | — | Jun 24 – Nov 11 | 70–100 |
| Sweet Alyssum | Mar 4 | Mar 4 | Mar 25 | Sep 1 | May 6 – Sep 9 | 45–60 |
| Sweet Pea | — | — | — | Aug 25 | Nov 3 – Jan 12 | 65–85 |
| Tulips | — | — | — | Sep 29 | Sep 15 – Oct 13 | 15–30 |
| Vinca (Annual) | Feb 4 | — | Apr 1 | — | Jun 10 – Nov 11 | 70–90 |
| Yarrow | Feb 18 | Apr 1 | Apr 15 | — | Jun 17 – Nov 11 | 60–90 |
| Zinnia | Mar 18 | Apr 1 | Apr 1 | — | Jun 10 – Nov 11 | 60–70 |