Wallowa County, OR — Planting Guide
Wallowa County is in USDA Zone 5a. The average last spring frost is May 11 and the first fall frost is September 22, giving you a growing season of approximately 134 days.
At an elevation of 1,240 ft, Wallowa County receives approximately 22.6 in of rainfall annually. Summer highs average 85°F with winter lows around 17°F. The predominant soil type is Silt Loam.
Based on 29 years of NOAA climate station data, the last frost date here varies by 63 days year to year — ranging from April 9 in warm years to June 12 in cold years. The growing season is trending shorter by about 7.74 days per decade. Wallowa County scores 55/100 (Moderate) on the Microclimate Index.
🌡️ Zone
5a (-20°F to -15°F min)
❄️ Last Frost
May 11
🍂 First Frost
September 22
📅 Growing Season
134 days
⛰️ Elevation
1,240 ft
🌧️ Annual Rainfall
22.6 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 | 15 days | — | None |
| Feb | 2.3 in | 16 days | — | None |
| Mar | 2.1 in | 15 days | — | None |
| Apr | 1.5 in | 13 days | 2.8 in | High |
| May | 1.3 in | 9 days | 3 in | High |
| Jun | 1 in | 6 days | 3.3 in | Critical |
| Jul | 0.4 in | 2 days | 3.9 in | Critical |
| Aug | 0.4 in | 3 days | 3.9 in | Critical |
| Sep | 1 in | 5 days | 3.3 in | Critical |
| Oct | 2.1 in | 11 days | 2.2 in | High |
| Nov | 3.9 in | 16 days | — | None |
| Dec | 3.6 in | 19 days | — | None |
Annual total: 22.5 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.
Wallowa County Soil Profile
Soil Type
Silt Loam
Soil pH
5.3-6.2
Drainage
Well Drained
Frost Risk Probability
Based on 29 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 12 | Oct 29 | 139 days |
| Cautious | May 24 | Oct 11 | 140 days |
| Average year | May 11 | Sep 22 | 134 days |
| Optimistic | May 1 | Sep 10 | 132 days |
| Aggressive (risky) | Apr 9 | Aug 31 | 144 days |
Not very — frost dates can vary by ±63 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 7.7 days per decade). Use the "Conservative" dates and choose fast-maturing varieties.
Gardening Difficulty Score
Wallowa County presents some gardening challenges. Choose adapted varieties and plan around frost dates.
Local Gardening Help in Wallowa 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 Wallowa County's climate and soil.
County Extension Office
Wallowa 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 Wallowa County
Finding local nurseries & garden centers in Wallowa County
Why Buy Local
Local nurseries carry plants that are proven to grow in your area. Staff can give you advice specific to Wallowa 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 Wallowa County OR" or "garden center Wallowa 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 Wallowa County OR" or check your extension office and local parks department. Facebook groups like "Wallowa 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
Monthly daylight hours and peak sun — critical for onion varieties, photoperiod-sensitive plants, and solar garden planning.
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 | 2.1 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 | 14.7 hr | 7.2 hr | Long day |
| June | 15.5 hr | 8.5 hr | Long day |
| July | 15.2 hr | 10.3 hr | Long day |
| August | 13.9 hr | 9.5 hr | Neutral |
| September | 12.3 hr | 7.1 hr | Neutral |
| October | 10.7 hr | 4 hr | Short day |
| November | 9.2 hr | 2.4 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 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 | 20°F | 28°F | ❄️ Dormant | ~36 weeks |
| Feb | 21°F | 29°F | ❄️ Dormant | ~36 weeks |
| Mar | 30°F | 33°F | ❄️ Dormant | ~36 weeks |
| Apr | 43°F | 43°F | 🐢 Slow | ~24 weeks |
| May | 57°F | 53°F | ♻️ Active | ~14 weeks |
| Jun | 69°F | 62°F | 🔥 Peak | ~8 weeks |
| Jul | 77°F | 69°F | 🔥 Peak | ~8 weeks |
| Aug | 76°F | 73°F | 🔥 Peak | ~8 weeks |
| Sep | 71°F | 68°F | 🔥 Peak | ~8 weeks |
| Oct | 57°F | 59°F | ♻️ Active | ~14 weeks |
| Nov | 43°F | 47°F | 🐢 Slow | ~24 weeks |
| Dec | 29°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 Wallowa 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 | Moderate | May, Jun, Jul, Aug |
| Japanese beetles | Moderate | Jun, Jul, Aug |
| Squash bugs | Low | Jun, Jul, Aug |
| Tomato hornworms | Low | Jul, Aug |
| Cabbage loopers | Low | May, Jun, Jul, Aug |
| Slugs | Low | Apr, May, Jun |
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 Wallowa 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 19 | Jul 21 | — | Rapid growth, attracts pollinators, suppresses weeds |
| Sorghum-sudan grass | May 22 | Jul 14 | — | Massive biomass, breaks compaction, suppresses nematodes |
| White clover | Apr 11 | Jul 21 | ✓ 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 7 | Sep 8 | — | Deep roots break compaction, attract pollinators and beneficial insects |
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 31 | Apr 27 | ✓ Yes | Fixes nitrogen, good for heavy clay soils |
| Daikon radish | Aug 5 | Apr 20 | — | Deep taproot breaks compaction, excellent for clay soils |
| Hairy vetch | Jun 28 | Apr 20 | ✓ Yes | Excellent nitrogen fixer, good for depleted soils |
| Oats | Aug 15 | Apr 27 | — | Quick biomass, winterkills in cold zones — no spring tillage needed |
| Winter rye | Jun 28 | Apr 27 | — | Suppresses weeds, prevents erosion, breaks up compacted soil |
| Winter wheat | Jun 15 | Apr 20 | — | 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: 9 mph Summer: 7 mph
Fall: 8 mph Winter: 12 mph
Prevailing wind: SW. Moderate wind — consider a temporary windbreak for young seedlings.
Windbreak Benefit
4.8/10
Moderately beneficial — a simple fence or trellis can protect delicate crops from wind stress.
Frost Pocket Risk
Moderate
Some terrain variation (586 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
11,214 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
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 22.5 inches of rain per year
- A 1,000 sq ft roof can collect roughly 11,214 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 Wallowa County
Soil Type
Silt Loam
Soil pH 5.3–6.2 · Excessively Drained drainage
Native soil is well-suited to most vegetables and herbs with regular compost additions.
Watering Needs
Drought stress: 3.5/10
Low-to-moderate drought stress. Plan to water 1–2 times per week during peak summer. (22.6 in. annual rainfall)
Season Tips
134-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 Wallowa County
106 vegetables that grow well in Zone 5a with planting dates for Wallowa County.
Show all 106 vegetables with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Acorn Squash | Apr 6 | May 18 | May 25 | Aug 17 – Sep 21 | 80–100 |
| Amaranth | Mar 16 | May 18 | May 25 | Aug 24 – Oct 12 | 90–120 |
| Arugula | Apr 6 | Apr 27 | May 11 | Jun 15 – Aug 17 | 30–50 |
| Asparagus | — | — | May 25 | — | 730–1095 |
| Beets | — | Apr 27 | — | Jun 22 – Jul 20 | 50–70 |
| Belgian Endive | Apr 6 | Apr 27 | May 11 | Aug 31 – Oct 26 | 110–150 |
| Bitter Melon | Mar 16 | May 18 | May 25 | Jul 27 – Sep 7 | 60–90 |
| Black Beans | — | May 18 | — | Aug 17 – Oct 5 | 90–120 |
| Bok Choy | Apr 6 | Apr 27 | May 11 | Jun 22 – Jul 27 | 40–60 |
| Broccoli | Apr 6 | Apr 27 | May 11 | Jul 13 – Aug 24 | 60–90 |
| Broccoli Rabe | Apr 6 | Apr 27 | May 11 | Jun 22 – Jul 27 | 40–60 |
| Brussels Sprouts | Apr 6 | Apr 27 | May 11 | Aug 10 – Oct 5 | 90–130 |
| Butternut Squash | Apr 6 | May 18 | May 25 | Aug 24 – Sep 28 | 85–110 |
| Cabbage | Apr 6 | Apr 27 | May 11 | Jul 13 – Sep 7 | 60–100 |
| Calabash | Mar 16 | May 18 | May 25 | Aug 17 – Oct 12 | 80–120 |
| Carrots | — | Apr 27 | — | Jun 29 – Aug 3 | 60–80 |
| Cauliflower | Apr 6 | Apr 27 | May 11 | Jul 6 – Sep 7 | 55–100 |
| Celeriac | Apr 6 | Apr 27 | May 11 | Aug 24 – Sep 28 | 100–120 |
| Celery | Apr 6 | Apr 27 | May 11 | Aug 3 – Sep 28 | 80–120 |
| Celtuce | Apr 6 | Apr 27 | May 11 | Jul 13 – Aug 24 | 60–90 |
| Chard | Apr 6 | Apr 27 | May 11 | Jul 6 – Aug 24 | 50–60 |
| Chickpeas | Apr 6 | Apr 27 | May 11 | Aug 3 – Sep 14 | 80–110 |
| Chicory | Apr 6 | Apr 27 | May 11 | Jul 13 – Aug 24 | 60–85 |
| Chinese Cabbage | Apr 6 | Apr 27 | May 11 | Jul 6 – Aug 3 | 50–70 |
| Christmas Lima Beans | Mar 16 | May 18 | May 25 | Aug 17 – Sep 21 | 80–100 |
| Collard Greens | Apr 6 | Apr 27 | May 11 | Jul 6 – Sep 7 | 55–75 |
| Corn | — | May 18 | — | Jul 20 – Sep 14 | 60–100 |
| Cowpeas | — | May 18 | — | Jul 20 – Aug 31 | 60–90 |
| Cress | Apr 6 | Apr 27 | May 11 | May 25 – Jun 15 | 14–21 |
| Crookneck Squash | Apr 6 | May 18 | May 25 | Jul 13 – Aug 10 | 45–60 |
| Crosne | — | Apr 27 | — | Sep 28 – Oct 12 | 150–200 |
| Cucumber | Apr 6 | May 18 | May 25 | Jul 20 – Sep 14 | 50–70 |
| Daikon | — | Apr 27 | — | Jun 22 – Jul 20 | 50–70 |
| Delicata Squash | Apr 6 | May 18 | May 25 | Aug 17 – Sep 21 | 80–100 |
| Edamame | — | May 18 | — | Aug 3 – Sep 14 | 75–100 |
| Eggplant | Mar 2 | May 18 | May 25 | Aug 3 – Oct 5 | 65–85 |
| Endive | Apr 6 | Apr 27 | May 11 | Jun 29 – Aug 3 | 45–65 |
| Escarole | Apr 6 | Apr 27 | May 11 | Jul 6 – Aug 3 | 50–70 |
| Fava Beans | Apr 6 | Apr 27 | May 11 | Jul 27 – Sep 7 | 75–100 |
| Fennel | Mar 16 | May 18 | May 25 | Jul 27 – Sep 7 | 60–90 |
| Garlic | — | — | — | — | 90–240 |
| Green Beans | — | May 18 | — | Jul 13 – Sep 7 | 50–65 |
| Horseradish | — | — | May 25 | Sep 28 – Nov 9 | 120–180 |
| Hot Peppers | Mar 2 | May 18 | May 25 | Aug 3 – Nov 9 | 70–120 |
| Hubbard Squash | Apr 6 | May 18 | May 25 | Sep 7 – Oct 12 | 100–120 |
| Kabocha | Apr 6 | May 18 | May 25 | Aug 24 – Sep 21 | 85–100 |
| Kai Lan | Apr 6 | Apr 27 | May 11 | Jun 29 – Jul 27 | 45–60 |
| Kale | Apr 6 | Apr 27 | May 11 | Jul 6 – Aug 31 | 50–70 |
| Kidney Beans | — | May 18 | — | Aug 17 – Sep 21 | 85–110 |
| Kohlrabi | Apr 6 | Apr 27 | May 11 | Jun 29 – Aug 3 | 45–65 |
| Komatsuna | Apr 6 | Apr 27 | May 11 | Jun 15 – Jul 20 | 35–50 |
| Leeks | Apr 6 | Apr 27 | May 11 | Aug 10 – Oct 26 | 90–150 |
| Lentils | Apr 6 | Apr 27 | May 11 | Aug 3 – Sep 14 | 80–110 |
| Lettuce | Apr 6 | Apr 27 | May 11 | Jun 15 – Aug 24 | 30–60 |
| Lima Beans | — | May 18 | — | Jul 20 – Aug 31 | 60–90 |
| Mache | Apr 6 | Apr 27 | May 11 | Jun 22 – Jul 27 | 40–60 |
| Melon | Apr 6 | May 18 | May 25 | Aug 3 – Sep 21 | 70–100 |
| Microgreens | Apr 6 | Apr 27 | May 11 | May 18 – Jun 15 | 7–21 |
| Mitsuba | Apr 6 | Apr 27 | May 4 | Jun 29 – Aug 24 | 50–70 |
| Mizuna | Apr 6 | Apr 27 | May 11 | Jun 15 – Jul 13 | 30–45 |
| Mustard Greens | Apr 6 | Apr 27 | May 11 | Jun 15 – Aug 17 | 30–50 |
| Napa Cabbage | Apr 6 | Apr 27 | May 11 | Jul 6 – Aug 10 | 55–75 |
| New Zealand Spinach | Mar 16 | May 18 | May 25 | Jul 20 – Aug 17 | 55–70 |
| Okra | Mar 16 | May 18 | May 25 | Jul 20 – Sep 14 | 50–65 |
| Onion | Apr 6 | Apr 27 | May 11 | Aug 10 – Sep 28 | 90–120 |
| Pac Choi | Apr 6 | Apr 27 | May 11 | Jun 22 – Jul 20 | 40–55 |
| Parsnip | — | Apr 27 | — | Aug 10 – Sep 21 | 100–130 |
| Patty Pan Squash | Apr 6 | May 18 | May 25 | Jul 13 – Aug 10 | 45–60 |
| Peas | Apr 6 | Apr 27 | May 11 | Jul 6 – Aug 31 | 55–70 |
| Peppers | Mar 2 | May 18 | May 25 | Jul 27 – Oct 5 | 60–90 |
| Pole Beans | Mar 16 | May 18 | May 25 | Jul 20 – Sep 14 | 55–70 |
| Potatoes | Mar 16 | May 18 | May 25 | Aug 3 – Oct 12 | 70–120 |
| Pumpkin | Apr 6 | May 18 | May 25 | Aug 24 – Oct 12 | 85–120 |
| Purslane | Apr 6 | Apr 27 | May 11 | Jun 22 – Jul 27 | 40–60 |
| Radicchio | Apr 6 | Apr 27 | May 11 | Jul 13 – Aug 17 | 60–80 |
| Radish | — | Apr 27 | — | May 25 – Jun 15 | 22–35 |
| Rhubarb | — | — | Jun 1 | — | 365–730 |
| Romanesco | Apr 6 | Apr 27 | May 11 | Jul 27 – Sep 7 | 75–100 |
| Rutabaga | — | Apr 27 | — | Jul 20 – Aug 24 | 80–100 |
| Salsify | — | Apr 27 | — | Aug 10 – Sep 21 | 100–130 |
| Savoy Cabbage | Apr 6 | Apr 27 | May 11 | Jul 20 – Sep 14 | 70–110 |
| Scallions | Apr 6 | Apr 27 | May 11 | Jul 6 – Aug 3 | 50–70 |
| Scarlet Runner Beans | Mar 16 | May 18 | May 25 | Jul 27 – Aug 31 | 60–80 |
| Shallot | Apr 6 | Apr 27 | May 11 | Aug 10 – Sep 28 | 90–120 |
| Shiso | Mar 23 | May 18 | May 25 | Jul 20 – Sep 14 | 50–70 |
| Snap Peas | Mar 16 | May 18 | May 25 | Jul 20 – Sep 14 | 55–70 |
| Snow Peas | Apr 6 | Apr 27 | May 11 | Jul 6 – Aug 31 | 50–65 |
| Soybeans | — | May 18 | — | Aug 10 – Oct 5 | 80–120 |
| Spaghetti Squash | Apr 6 | May 18 | May 25 | Aug 24 – Sep 21 | 85–100 |
| Spinach | Apr 6 | Apr 27 | May 11 | Jun 15 – Aug 17 | 35–50 |
| Squash (Summer) | Apr 6 | May 18 | May 25 | Jul 13 – Sep 14 | 45–65 |
| Squash (Winter) | Apr 6 | May 18 | May 25 | Aug 17 – Oct 12 | 80–120 |
| Sunchoke | — | — | May 25 | Sep 14 – Nov 9 | 110–150 |
| Sunflower | Mar 16 | May 18 | May 25 | Aug 3 – Sep 21 | 70–100 |
| Sweet Corn | — | May 18 | — | Jul 20 – Aug 31 | 60–90 |
| Sweet Potatoes | Mar 16 | May 18 | May 25 | Aug 24 – Oct 12 | 90–120 |
| Tatsoi | Apr 6 | Apr 27 | May 11 | Jun 15 – Jul 20 | 35–50 |
| Tomatillo | Mar 16 | May 18 | May 25 | Jul 27 – Oct 5 | 60–85 |
| Tomatoes | Mar 16 | May 18 | May 25 | Jul 27 – Oct 5 | 60–85 |
| Turnip | — | Apr 27 | — | Jun 8 – Jul 13 | 40–60 |
| Watercress | Apr 6 | Apr 27 | May 11 | Jun 22 – Jul 27 | 40–60 |
| Watermelon | Apr 6 | May 18 | May 25 | Aug 3 – Sep 21 | 70–100 |
| Wax Beans | — | May 18 | — | Jul 13 – Sep 7 | 50–65 |
| Winter Melon | Mar 16 | May 18 | May 25 | Aug 24 – Oct 12 | 90–120 |
| Yard Long Beans | Mar 16 | May 18 | May 25 | Jul 20 – Aug 31 | 55–80 |
| Zucchini | Apr 6 | May 18 | May 25 | Jul 13 – Sep 7 | 45–60 |
🍓 Fruits to Grow in Wallowa County
27 fruits that grow well in Zone 5a with planting dates for Wallowa County.
Show all 27 fruits with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Alpine Strawberries | — | — | Jun 1 | Aug 31 – Nov 16 | 90–180 |
| Aronia | — | — | Jun 1 | — | 730–1095 |
| Blackberries | — | — | Jun 1 | — | 365–730 |
| Blueberries | — | — | Jun 1 | — | 730–1095 |
| Boysenberries | — | — | Jun 1 | — | 365–730 |
| Cantaloupe | — | — | Jun 1 | Aug 10 – Sep 14 | 70–90 |
| Che Fruit | — | — | Jun 1 | — | 1095–1825 |
| Cranberries | — | — | Jun 1 | — | 730–1095 |
| Currants | — | — | Jun 1 | — | 730–1095 |
| Elderberries | — | — | Jun 1 | — | 730–1095 |
| Goji Berries | — | — | Jun 1 | — | 730–1095 |
| Gooseberries | — | — | Jun 1 | — | 730–1095 |
| Grapes | — | — | Jun 1 | — | 730–1095 |
| Ground Cherry | — | — | Jun 1 | Aug 10 – Oct 5 | 65–80 |
| Hardy Kiwi | — | — | Jun 1 | — | 1095–1825 |
| Haskaps | — | — | Jun 1 | — | 730–1095 |
| Honeydew | — | — | Jun 1 | Aug 24 – Oct 5 | 80–110 |
| Jostaberry | — | — | Jun 1 | — | 730–1095 |
| Lingonberries | — | — | Jun 1 | — | 730–1095 |
| Medlar | — | — | Jun 1 | — | 1095–1825 |
| Mulberries | — | — | Jun 1 | — | 730–1825 |
| Pawpaw | — | — | Jun 1 | — | 1095–2555 |
| Persimmon | — | — | Jun 1 | — | 1095–2555 |
| Quince | — | — | Jun 1 | — | 1095–1825 |
| Raspberries | — | — | Jun 1 | — | 365–730 |
| Serviceberries | — | — | Jun 1 | — | 730–1095 |
| Strawberries | — | — | Jun 1 | Aug 31 – Nov 16 | 90–365 |
🌿 Herbs to Grow in Wallowa County
37 herbs that grow well in Zone 5a with planting dates for Wallowa County.
Show all 37 herbs with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Angelica | Apr 6 | Apr 27 | May 4 | — | 365–730 |
| Anise | Apr 6 | Apr 27 | May 4 | Aug 3 – Oct 19 | 90–120 |
| Basil | Mar 23 | May 18 | May 25 | Jul 20 – Sep 21 | 50–75 |
| Bee Balm | — | — | May 18 | Aug 17 – Nov 2 | 90–120 |
| Borage | Apr 6 | Apr 27 | May 4 | Jun 29 – Aug 17 | 50–60 |
| Caraway | Apr 6 | Apr 27 | May 4 | — | 365–450 |
| Catnip | — | — | May 18 | Jul 20 – Sep 21 | 60–80 |
| Chamomile | Apr 6 | Apr 27 | May 4 | Jul 6 – Sep 14 | 60–90 |
| Chervil | Apr 6 | Apr 27 | May 4 | Jun 15 – Aug 17 | 40–60 |
| Chives | — | — | May 18 | Jul 20 – Sep 28 | 60–90 |
| Cilantro | Apr 6 | Apr 27 | May 4 | Jun 15 – Aug 17 | 40–60 |
| Comfrey | — | — | May 18 | Jul 20 – Sep 28 | 60–90 |
| Cumin | Apr 6 | Apr 27 | May 4 | Aug 17 – Oct 19 | 100–120 |
| Dill | Apr 6 | Apr 27 | May 4 | Jun 15 – Aug 17 | 40–60 |
| Echinacea | — | — | May 18 | Sep 21 – Nov 2 | 120–180 |
| Epazote | Mar 23 | May 18 | May 25 | Jul 13 – Sep 7 | 45–60 |
| Fennel (herb) | Apr 6 | Apr 27 | May 4 | Jul 6 – Sep 14 | 60–90 |
| Feverfew | — | — | May 18 | Aug 17 – Nov 2 | 90–120 |
| Garlic Chives | — | — | May 18 | Jul 20 – Sep 28 | 60–90 |
| Horehound | — | — | May 18 | Aug 3 – Sep 28 | 75–90 |
| Hyssop | — | — | May 18 | Jul 27 – Sep 28 | 70–90 |
| Lavender | — | — | May 18 | Aug 17 – Nov 2 | 90–200 |
| Lemon Balm | — | — | May 18 | Jul 20 – Sep 7 | 60–70 |
| Lemon Thyme | — | — | May 18 | Jul 27 – Sep 28 | 70–90 |
| Lovage | — | — | May 18 | Jul 27 – Sep 28 | 70–90 |
| Mint | — | — | May 18 | Jul 20 – Sep 28 | 60–90 |
| Oregano | — | — | May 18 | Jul 20 – Sep 28 | 60–90 |
| Parsley | Apr 6 | Apr 27 | May 4 | Jul 6 – Sep 7 | 60–80 |
| Rue | — | — | May 18 | Jul 27 – Sep 28 | 70–90 |
| Sage | — | — | May 18 | Aug 3 – Sep 28 | 75–90 |
| Savory | — | — | May 18 | Jul 13 – Sep 7 | 50–70 |
| Sorrel | Apr 6 | Apr 27 | May 4 | Jun 15 – Aug 17 | 40–60 |
| Tarragon | — | — | May 18 | Jul 20 – Sep 28 | 60–90 |
| Thai Basil | Mar 23 | May 18 | May 25 | Jul 20 – Sep 21 | 50–75 |
| Thyme | — | — | May 18 | Jul 27 – Sep 28 | 70–90 |
| Valerian | — | — | May 18 | Sep 21 – Nov 2 | 120–180 |
| Yarrow | — | — | May 18 | Aug 17 – Nov 2 | 90–120 |
Monthly Planting Guide for Wallowa County
Gardening Guides & Resources
Helpful guides from The Ultimate Homestead to improve your garden in Wallowa County.
Frequently Asked Questions
What planting zone is Wallowa County, OR?
Wallowa County is in USDA Hardiness Zone 5a. 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 Wallowa County, OR?
Based on 29 years of NOAA weather station data, the median last spring frost in Wallowa County falls around May 11. In 8 out of 10 years, last frost lands between April 9 and June 12 — a 63-day window of variability. Use June 12 as your conservative safe-to-plant date for frost-sensitive crops.
When is the first fall frost in Wallowa County, OR?
The median first fall frost in Wallowa County arrives around September 22. In cold years it can arrive as early as August 31; in mild years as late as October 29. Harvest or protect frost-sensitive crops — tomatoes, peppers, basil, squash — before this date.
How long is the growing season in Wallowa County?
Wallowa County has a frost-free growing season of approximately 134 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 7.74 days per decade.
What is the soil like in Wallowa County for gardening?
Wallowa County has predominantly Silt Loam soil with a pH range of 5.3–6.2 and Excessively Drained drainage. Most vegetables and herbs grow well with standard composting and seasonal soil amendment.
What is grown commercially in Wallowa County?
Wallowa County has commercial agriculture that includes Wheat, Apples, Potatoes, Hops. These crops reflect the local climate and soil conditions — what succeeds commercially often translates well to home gardens in the same area.
Is Wallowa County a good location for home gardening?
Wallowa 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 Wallowa County gardeners in Zone 5a 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.
