Coos County, OR — Planting Guide
Your May gardening checklist
Here's what deserves your attention in Coos County, Oregon this month. Everything below is tailored to Zone 9a and timed around your local frost dates.
-
Sow basil, peppers, and pole beans in trays indoors
Label every cell. You will absolutely forget which is which otherwise.
-
Harvest basil, carrots, and cucumber as they ripen
Check every 1–2 days. Many of these get tough or go to seed if you wait too long.
Looking ahead to June
- First harvests: basil, carrots, and cucumber
Coos County is in USDA Zone 9a. The average last spring frost is March 22 and the first fall frost is November 19, giving you a growing season of approximately 242 days.
At an elevation of 96 ft, Coos County receives approximately 38.8 in of rainfall annually. Summer highs average 89°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 68 days year to year — ranging from February 14 in warm years to April 22 in cold years. The growing season is trending shorter by about 4.05 days per decade. Coos County scores 64/100 (Good) on the Microclimate Index.
🌡️ Zone
9a (°F to °F min)
❄️ Last Frost
March 22
🍂 First Frost
November 19
📅 Growing Season
242 days
⛰️ Elevation
96 ft
🌧️ Annual Rainfall
38.8 in
Monthly Watering Calendar
When you'll need to water your garden — based on average monthly rainfall vs. the ~1 inch/week most gardens need.
View detailed monthly data
| Month | Avg Rainfall | Rainy Days | Extra Water Needed | Watering Effort |
|---|---|---|---|---|
| Jan | 5.5 in | 20 days | — | None |
| Feb | 4.5 in | 17 days | — | Low |
| Mar | 4.4 in | 15 days | — | Low |
| Apr | 3.1 in | 11 days | 1.2 in | Moderate |
| May | 2.3 in | 9 days | 2 in | High |
| Jun | 1.6 in | 7 days | 2.7 in | High |
| Jul | 0.6 in | 3 days | 3.7 in | Critical |
| Aug | 0.8 in | 3 days | 3.5 in | Critical |
| Sep | 1.4 in | 4 days | 2.9 in | High |
| Oct | 3.3 in | 10 days | 1 in | Moderate |
| Nov | 5.9 in | 15 days | — | Low |
| Dec | 5.5 in | 16 days | — | None |
Annual total: 38.9 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.
Coos County Soil Profile
Soil Type
Silt Loam
Soil pH
5.4-6.8
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) | Apr 22 | Dec 15 | 237 days |
| Cautious | Apr 3 | Nov 29 | 240 days |
| Average year | Mar 22 | Nov 19 | 242 days |
| Optimistic | Mar 7 | Nov 1 | 239 days |
| Aggressive (risky) | Feb 14 | Oct 18 | 246 days |
Not very — frost dates can vary by ±68 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 4.1 days per decade). Use the "Conservative" dates and choose fast-maturing varieties.
Gardening Difficulty Score
Coos County offers good growing conditions. A little planning around frost dates goes a long way.
Local Gardening Help in Coos 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 Coos County's climate and soil.
County Extension Office
Coos 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 Coos County
Finding local nurseries & garden centers in Coos County
Why Buy Local
Local nurseries carry plants that are proven to grow in your area. Staff can give you advice specific to Coos 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 Coos County OR" or "garden center Coos 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 Coos County OR" or check your extension office and local parks department. Facebook groups like "Coos 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
15.2 hours
Summer solstice daylight
Shortest Day
8.8 hours
Winter solstice daylight
Peak Sun Hours
10.7 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 | 9.1 hr | 2.2 hr | Short day |
| February | 10.3 hr | 3.2 hr | Short day |
| March | 11.6 hr | 4.1 hr | Short day |
| April | 13.2 hr | 5.8 hr | Neutral |
| May | 14.5 hr | 7.5 hr | Long day |
| June | 15.2 hr | 8.3 hr | Long day |
| July | 14.9 hr | 10.7 hr | Long day |
| August | 13.8 hr | 8.9 hr | Neutral |
| September | 12.3 hr | 7.1 hr | Neutral |
| October | 10.8 hr | 4 hr | Short day |
| November | 9.5 hr | 2.4 hr | Short day |
| December | 8.8 hr | 2 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 Apr through Oct.
Best Month to Compost
May
Microbial activity peaks when soil is warm.
Active Composting
9 months
Nearly year-round composting.
View detailed monthly data
| Month | Soil 4" Deep | Soil 8" Deep | Compost Activity | Time to Finish |
|---|---|---|---|---|
| Jan | 43°F | 52°F | 🐢 Slow | ~24 weeks |
| Feb | 45°F | 51°F | 🐢 Slow | ~24 weeks |
| Mar | 53°F | 54°F | ♻️ Active | ~14 weeks |
| Apr | 62°F | 60°F | ♻️ Active | ~14 weeks |
| May | 71°F | 68°F | 🔥 Peak | ~8 weeks |
| Jun | 81°F | 78°F | 🔥 Peak | ~8 weeks |
| Jul | 88°F | 84°F | 🔥 Peak | ~8 weeks |
| Aug | 91°F | 87°F | 🔥 Peak | ~8 weeks |
| Sep | 83°F | 82°F | 🔥 Peak | ~8 weeks |
| Oct | 72°F | 75°F | 🔥 Peak | ~8 weeks |
| Nov | 60°F | 64°F | ♻️ Active | ~14 weeks |
| Dec | 48°F | 55°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 Coos County
Computed from local climate patterns — warmer, humid conditions increase pest generations and fungal disease risk.
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 | High | Jun, Jul, Aug, Sep |
| Fire ants | Low | 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 Coos 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 | Mar 30 | Sep 24 | — | Rapid growth, attracts pollinators, suppresses weeds |
| Cowpeas (southern peas) | Apr 4 | Sep 17 | ✓ Yes | Excellent nitrogen fixer for warm climates, edible |
| Sorghum-sudan grass | Mar 27 | Sep 24 | — | Massive biomass, breaks compaction, suppresses nematodes |
| White clover | Feb 21 | Sep 17 | ✓ 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 9 | Oct 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 | Sep 15 | Mar 8 | ✓ Yes | Fixes nitrogen, good for heavy clay soils |
| Crimson clover | Sep 9 | Mar 8 | ✓ Yes | Fixes nitrogen, attracts pollinators in spring |
| Daikon radish | Oct 2 | Mar 8 | — | Deep taproot breaks compaction, excellent for clay soils |
| Hairy vetch | Sep 3 | Mar 1 | ✓ Yes | Excellent nitrogen fixer, good for depleted soils |
| Oats | Oct 8 | Mar 1 | — | Quick biomass, winterkills in cold zones — no spring tillage needed |
| Winter rye | Aug 14 | Mar 1 | — | Suppresses weeds, prevents erosion, breaks up compacted soil |
| Winter wheat | Aug 17 | Mar 1 | — | 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: 12 mph Summer: 10 mph
Fall: 9 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 (580 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
19,387 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, 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 38.9 inches of rain per year
- A 1,000 sq ft roof can collect roughly 19,387 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 Coos County
Soil Type
Silt Loam
Soil pH 5.4–6.8 · Well Drained drainage
Native soil is well-suited to most vegetables and herbs with regular compost additions.
Watering Needs
Drought stress: 1.5/10
Coos County has very low drought pressure. Natural rainfall usually meets garden needs — water only during extended dry spells.
Season Tips
242-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 24-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
Reduce heat stress and sun scorch in hot climates with UV-stabilized shade cloth.
Test your soil pH, nitrogen, phosphorus, and potassium levels before planting.
Get instant, accurate soil pH readings to fine-tune your amendments.
🥬 Vegetables to Grow in Coos County
115 vegetables that grow well in Zone 9a with planting dates for Coos County.
Show all 115 vegetables with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Acorn Squash | Feb 22 | Mar 22 | Mar 29 | Jun 21 – Jul 26 | 80–100 |
| Amaranth | Feb 8 | Mar 22 | Mar 29 | Jun 28 – Aug 16 | 90–120 |
| Artichoke | — | — | Apr 5 | Aug 9 – Oct 18 | 120–180 |
| Arugula | Feb 22 | Mar 1 | Mar 22 | Apr 26 – Jun 28 | 30–50 |
| Asparagus | — | — | Apr 5 | — | 730–1095 |
| Beets | — | Mar 1 | — | Apr 26 – May 24 | 50–70 |
| Belgian Endive | Feb 22 | Mar 1 | Mar 22 | Jul 12 – Sep 6 | 110–150 |
| Bitter Melon | Feb 8 | Mar 22 | Mar 29 | May 31 – Jul 12 | 60–90 |
| Black Beans | — | Mar 29 | — | Jun 28 – Aug 16 | 90–120 |
| Bok Choy | Feb 22 | Mar 1 | Mar 22 | May 3 – Jun 7 | 40–60 |
| Broccoli | Feb 22 | Mar 1 | Mar 22 | May 24 – Jul 5 | 60–90 |
| Broccoli Rabe | Feb 22 | Mar 1 | Mar 22 | May 3 – Jun 7 | 40–60 |
| Brussels Sprouts | Feb 22 | Mar 1 | Mar 22 | Jun 21 – Aug 16 | 90–130 |
| Butternut Squash | Feb 22 | Mar 22 | Mar 29 | Jun 28 – Aug 2 | 85–110 |
| Cabbage | Feb 22 | Mar 1 | Mar 22 | May 24 – Jul 19 | 60–100 |
| Calabash | Feb 8 | Mar 22 | Mar 29 | Jun 21 – Aug 16 | 80–120 |
| Cardoon | — | — | Apr 5 | Aug 9 – Sep 20 | 120–150 |
| Carrots | — | Mar 1 | — | May 3 – Jun 7 | 60–80 |
| Cauliflower | Feb 22 | Mar 1 | Mar 22 | May 17 – Jul 19 | 55–100 |
| Celeriac | Feb 22 | Mar 1 | Mar 22 | Jul 5 – Aug 9 | 100–120 |
| Celery | Feb 22 | Mar 1 | Mar 22 | Jun 14 – Aug 9 | 80–120 |
| Celtuce | Feb 22 | Mar 1 | Mar 22 | May 24 – Jul 5 | 60–90 |
| Chard | Feb 22 | Mar 1 | Mar 22 | May 17 – Jul 5 | 50–60 |
| Chayote | Feb 8 | Mar 22 | Mar 29 | Aug 2 – Oct 11 | 120–180 |
| Chickpeas | Feb 22 | Mar 1 | Mar 22 | Jun 14 – Jul 26 | 80–110 |
| Chicory | Feb 22 | Mar 1 | Mar 22 | May 24 – Jul 5 | 60–85 |
| Chinese Cabbage | Feb 22 | Mar 1 | Mar 22 | May 17 – Jun 14 | 50–70 |
| Christmas Lima Beans | Feb 8 | Mar 22 | Mar 29 | Jun 21 – Jul 26 | 80–100 |
| Collard Greens | Feb 22 | Mar 1 | Mar 22 | May 17 – Jul 19 | 55–75 |
| Corn | — | Mar 29 | — | May 31 – Jul 26 | 60–100 |
| Cowpeas | — | Mar 29 | — | May 31 – Jul 12 | 60–90 |
| Cress | Feb 22 | Mar 1 | Mar 22 | Apr 5 – Apr 26 | 14–21 |
| Crookneck Squash | Feb 22 | Mar 22 | Mar 29 | May 17 – Jun 14 | 45–60 |
| Crosne | — | Mar 1 | — | Aug 2 – Oct 4 | 150–200 |
| Cucumber | Feb 22 | Mar 22 | Mar 29 | May 24 – Jul 19 | 50–70 |
| Daikon | — | Mar 1 | — | Apr 26 – May 24 | 50–70 |
| Delicata Squash | Feb 22 | Mar 22 | Mar 29 | Jun 21 – Jul 26 | 80–100 |
| Edamame | — | Mar 29 | — | Jun 14 – Jul 26 | 75–100 |
| Eggplant | Feb 8 | Mar 22 | Mar 29 | Jun 7 – Aug 9 | 65–85 |
| Endive | Feb 22 | Mar 1 | Mar 22 | May 10 – Jun 14 | 45–65 |
| Escarole | Feb 22 | Mar 1 | Mar 22 | May 17 – Jun 14 | 50–70 |
| Fava Beans | Feb 22 | Mar 1 | Mar 22 | Jun 7 – Jul 19 | 75–100 |
| Fennel | Feb 8 | Mar 22 | Mar 29 | May 31 – Jul 12 | 60–90 |
| Garlic | — | — | — | — | 90–240 |
| Ginger | Feb 8 | Mar 22 | Mar 29 | Nov 29 – Jan 24 | 240–300 |
| Green Beans | — | Mar 29 | — | May 24 – Jul 19 | 50–65 |
| Horseradish | — | — | Apr 5 | Aug 9 – Oct 18 | 120–180 |
| Hot Peppers | Feb 8 | Mar 22 | Mar 29 | Jun 7 – Sep 13 | 70–120 |
| Hubbard Squash | Feb 22 | Mar 22 | Mar 29 | Jul 12 – Aug 16 | 100–120 |
| Jicama | Feb 8 | Mar 22 | Mar 29 | Aug 2 – Oct 11 | 120–180 |
| Kabocha | Feb 22 | Mar 22 | Mar 29 | Jun 28 – Jul 26 | 85–100 |
| Kai Lan | Feb 22 | Mar 1 | Mar 22 | May 10 – Jun 7 | 45–60 |
| Kale | Feb 22 | Mar 1 | Mar 22 | May 17 – Jul 12 | 50–70 |
| Kidney Beans | — | Mar 29 | — | Jun 28 – Aug 2 | 85–110 |
| Kohlrabi | Feb 22 | Mar 1 | Mar 22 | May 10 – Jun 14 | 45–65 |
| Komatsuna | Feb 22 | Mar 1 | Mar 22 | Apr 26 – May 31 | 35–50 |
| Leeks | Feb 22 | Mar 1 | Mar 22 | Jun 21 – Sep 6 | 90–150 |
| Lentils | Feb 22 | Mar 1 | Mar 22 | Jun 14 – Jul 26 | 80–110 |
| Lettuce | Feb 22 | Mar 1 | Mar 22 | Apr 26 – Jul 5 | 30–60 |
| Lima Beans | — | Mar 29 | — | May 31 – Jul 12 | 60–90 |
| Loofah | Feb 8 | Mar 22 | Mar 29 | Jul 12 – Sep 13 | 100–150 |
| Luffa | Feb 8 | Mar 22 | Mar 29 | Jun 28 – Sep 13 | 90–150 |
| Mache | Feb 22 | Mar 1 | Mar 22 | May 3 – Jun 7 | 40–60 |
| Malabar Spinach | Feb 8 | Mar 22 | Mar 29 | May 24 – Jun 21 | 55–70 |
| Melon | Feb 22 | Mar 22 | Mar 29 | Jun 7 – Jul 26 | 70–100 |
| Microgreens | Feb 22 | Mar 1 | Mar 22 | Mar 29 – Apr 26 | 7–21 |
| Mitsuba | Feb 22 | Mar 1 | Mar 15 | May 10 – Jul 5 | 50–70 |
| Mizuna | Feb 22 | Mar 1 | Mar 22 | Apr 26 – May 24 | 30–45 |
| Mustard Greens | Feb 22 | Mar 1 | Mar 22 | Apr 26 – Jun 28 | 30–50 |
| Napa Cabbage | Feb 22 | Mar 1 | Mar 22 | May 17 – Jun 21 | 55–75 |
| New Zealand Spinach | Feb 8 | Mar 22 | Mar 29 | May 24 – Jun 21 | 55–70 |
| Okra | Feb 8 | Mar 22 | Mar 29 | May 24 – Jul 19 | 50–65 |
| Onion | Feb 22 | Mar 1 | Mar 22 | Jun 21 – Aug 9 | 90–120 |
| Pac Choi | Feb 22 | Mar 1 | Mar 22 | May 3 – May 31 | 40–55 |
| Parsnip | — | Mar 1 | — | Jun 14 – Jul 26 | 100–130 |
| Patty Pan Squash | Feb 22 | Mar 22 | Mar 29 | May 17 – Jun 14 | 45–60 |
| Peas | Feb 22 | Mar 1 | Mar 22 | May 17 – Jul 12 | 55–70 |
| Peppers | Feb 8 | Mar 22 | Mar 29 | May 31 – Aug 9 | 60–90 |
| Pole Beans | Feb 8 | Mar 22 | Mar 29 | May 24 – Jul 19 | 55–70 |
| Potatoes | Feb 8 | Mar 22 | Mar 29 | Jun 7 – Aug 16 | 70–120 |
| Pumpkin | Feb 22 | Mar 22 | Mar 29 | Jun 28 – Aug 16 | 85–120 |
| Purslane | Feb 22 | Mar 1 | Mar 22 | May 3 – Jun 7 | 40–60 |
| Radicchio | Feb 22 | Mar 1 | Mar 22 | May 24 – Jun 28 | 60–80 |
| Radish | — | Mar 1 | — | Mar 29 – Apr 19 | 22–35 |
| Romanesco | Feb 22 | Mar 1 | Mar 22 | Jun 7 – Jul 19 | 75–100 |
| Rutabaga | — | Mar 1 | — | May 24 – Jun 28 | 80–100 |
| Salsify | — | Mar 1 | — | Jun 14 – Jul 26 | 100–130 |
| Savoy Cabbage | Feb 22 | Mar 1 | Mar 22 | May 31 – Jul 26 | 70–110 |
| Scallions | Feb 22 | Mar 1 | Mar 22 | May 17 – Jun 14 | 50–70 |
| Scarlet Runner Beans | Feb 8 | Mar 22 | Mar 29 | May 31 – Jul 5 | 60–80 |
| Shallot | Feb 22 | Mar 1 | Mar 22 | Jun 21 – Aug 9 | 90–120 |
| Shiso | Feb 8 | Mar 29 | Mar 29 | May 24 – Jul 19 | 50–70 |
| Snap Peas | Feb 8 | Mar 22 | Mar 29 | May 24 – Jul 19 | 55–70 |
| Snow Peas | Feb 22 | Mar 1 | Mar 22 | May 17 – Jul 12 | 50–65 |
| Soybeans | — | Mar 29 | — | Jun 21 – Aug 16 | 80–120 |
| Spaghetti Squash | Feb 22 | Mar 22 | Mar 29 | Jun 28 – Jul 26 | 85–100 |
| Spinach | Feb 22 | Mar 1 | Mar 22 | Apr 26 – Jun 28 | 35–50 |
| Squash (Summer) | Feb 22 | Mar 22 | Mar 29 | May 17 – Jul 19 | 45–65 |
| Squash (Winter) | Feb 22 | Mar 22 | Mar 29 | Jun 21 – Aug 16 | 80–120 |
| Sunchoke | — | — | Apr 5 | Jul 26 – Sep 20 | 110–150 |
| Sunflower | Feb 8 | Mar 22 | Mar 29 | Jun 7 – Jul 26 | 70–100 |
| Sweet Corn | — | Mar 29 | — | May 31 – Jul 12 | 60–90 |
| Sweet Potatoes | Feb 8 | Mar 22 | Mar 29 | Jun 28 – Aug 16 | 90–120 |
| Tatsoi | Feb 22 | Mar 1 | Mar 22 | Apr 26 – May 31 | 35–50 |
| Tomatillo | Feb 8 | Mar 22 | Mar 29 | May 31 – Aug 9 | 60–85 |
| Tomatoes | Feb 8 | Mar 22 | Mar 29 | May 31 – Aug 9 | 60–85 |
| Turmeric | Feb 8 | Mar 22 | Mar 29 | Nov 29 – Jan 24 | 240–300 |
| Turnip | — | Mar 1 | — | Apr 12 – May 17 | 40–60 |
| Watercress | Feb 22 | Mar 1 | Mar 22 | May 3 – Jun 7 | 40–60 |
| Watermelon | Feb 22 | Mar 22 | Mar 29 | Jun 7 – Jul 26 | 70–100 |
| Wax Beans | — | Mar 29 | — | May 24 – Jul 19 | 50–65 |
| Winter Melon | Feb 8 | Mar 22 | Mar 29 | Jun 28 – Aug 16 | 90–120 |
| Yam | Feb 8 | Mar 22 | Mar 29 | Sep 27 – Jan 24 | 180–330 |
| Yard Long Beans | Feb 8 | Mar 22 | Mar 29 | May 24 – Jul 5 | 55–80 |
| Zucchini | Feb 22 | Mar 22 | Mar 29 | May 17 – Jul 12 | 45–60 |
🍓 Fruits to Grow in Coos County
24 fruits that grow well in Zone 9a with planting dates for Coos County.
Show all 24 fruits with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Alpine Strawberries | — | — | Apr 5 | Jul 5 – Oct 18 | 90–180 |
| Blackberries | — | — | Apr 5 | — | 365–730 |
| Boysenberries | — | — | Apr 5 | — | 365–730 |
| Cantaloupe | — | — | Apr 5 | Jun 14 – Jul 19 | 70–90 |
| Che Fruit | — | — | Apr 5 | — | 1095–1825 |
| Dragon Fruit | — | — | Apr 5 | — | 365–730 |
| Elderberries | — | — | Apr 5 | — | 730–1095 |
| Figs | — | — | Apr 5 | — | 730–1825 |
| Goji Berries | — | — | Apr 5 | — | 730–1095 |
| Grapes | — | — | Apr 5 | — | 730–1095 |
| Ground Cherry | — | — | Apr 5 | Jun 14 – Aug 9 | 65–80 |
| Guava | — | — | Apr 5 | — | 365–730 |
| Honeydew | — | — | Apr 5 | Jun 28 – Aug 9 | 80–110 |
| Kiwi | — | — | Apr 5 | — | 1095–1825 |
| Loquat | — | — | Apr 5 | — | 730–1825 |
| Mulberries | — | — | Apr 5 | — | 730–1825 |
| Passion Fruit | — | — | Apr 5 | — | 365–545 |
| Pawpaw | — | — | Apr 5 | — | 1095–2555 |
| Persimmon | — | — | Apr 5 | — | 1095–2555 |
| Pomegranate | — | — | Apr 5 | — | 730–1095 |
| Quince | — | — | Apr 5 | — | 1095–1825 |
| Raspberries | — | — | Apr 5 | — | 365–730 |
| Serviceberries | — | — | Apr 5 | — | 730–1095 |
| Strawberries | — | — | Apr 5 | Jul 5 – Jan 31 | 90–365 |
🌿 Herbs to Grow in Coos County
40 herbs that grow well in Zone 9a with planting dates for Coos County.
Show all 40 herbs with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Anise | Feb 22 | Mar 1 | Mar 15 | Jun 14 – Aug 30 | 90–120 |
| Basil | Feb 8 | Mar 29 | Mar 29 | May 24 – Jul 26 | 50–75 |
| Bee Balm | — | — | Mar 29 | Jun 28 – Sep 13 | 90–120 |
| Borage | Feb 22 | Mar 1 | Mar 15 | May 10 – Jun 28 | 50–60 |
| Caraway | Feb 22 | Mar 1 | Mar 15 | — | 365–450 |
| Catnip | — | — | Mar 29 | May 31 – Aug 2 | 60–80 |
| Chamomile | Feb 22 | Mar 1 | Mar 15 | May 17 – Jul 26 | 60–90 |
| Chervil | Feb 22 | Mar 1 | Mar 15 | Apr 26 – Jun 28 | 40–60 |
| Chives | — | — | Mar 29 | May 31 – Aug 9 | 60–90 |
| Cilantro | Feb 22 | Mar 1 | Mar 15 | Apr 26 – Jun 28 | 40–60 |
| Comfrey | — | — | Mar 29 | May 31 – Aug 9 | 60–90 |
| Cumin | Feb 22 | Mar 1 | Mar 15 | Jun 28 – Aug 30 | 100–120 |
| Dill | Feb 22 | Mar 1 | Mar 15 | Apr 26 – Jun 28 | 40–60 |
| Echinacea | — | — | Mar 29 | Aug 2 – Nov 8 | 120–180 |
| Epazote | Feb 8 | Mar 29 | Mar 29 | May 17 – Jul 12 | 45–60 |
| Fennel (herb) | Feb 22 | Mar 1 | Mar 15 | May 17 – Jul 26 | 60–90 |
| Feverfew | — | — | Mar 29 | Jun 28 – Sep 13 | 90–120 |
| Garlic Chives | — | — | Mar 29 | May 31 – Aug 9 | 60–90 |
| Horehound | — | — | Mar 29 | Jun 14 – Aug 9 | 75–90 |
| Hyssop | — | — | Mar 29 | Jun 7 – Aug 9 | 70–90 |
| Lavender | — | — | Mar 29 | Jun 28 – Nov 29 | 90–200 |
| Lemon Balm | — | — | Mar 29 | May 31 – Jul 19 | 60–70 |
| Lemon Thyme | — | — | Mar 29 | Jun 7 – Aug 9 | 70–90 |
| Lemon Verbena | Feb 8 | Mar 29 | Mar 29 | May 31 – Aug 9 | 60–90 |
| Lemongrass | Feb 8 | Mar 29 | Mar 29 | Jun 14 – Sep 13 | 75–120 |
| Marjoram | — | — | Mar 29 | May 31 – Aug 9 | 60–90 |
| Mint | — | — | Mar 29 | May 31 – Aug 9 | 60–90 |
| Oregano | — | — | Mar 29 | May 31 – Aug 9 | 60–90 |
| Parsley | Feb 22 | Mar 1 | Mar 15 | May 17 – Jul 19 | 60–80 |
| Rosemary | — | — | Mar 29 | Jun 21 – Nov 8 | 80–180 |
| Rue | — | — | Mar 29 | Jun 7 – Aug 9 | 70–90 |
| Sage | — | — | Mar 29 | Jun 14 – Aug 9 | 75–90 |
| Savory | — | — | Mar 29 | May 24 – Jul 19 | 50–70 |
| Sorrel | Feb 22 | Mar 1 | Mar 15 | Apr 26 – Jun 28 | 40–60 |
| Stevia | Feb 8 | Mar 29 | Mar 29 | May 31 – Aug 9 | 60–90 |
| Tarragon | — | — | Mar 29 | May 31 – Aug 9 | 60–90 |
| Thai Basil | Feb 8 | Mar 29 | Mar 29 | May 24 – Jul 26 | 50–75 |
| Thyme | — | — | Mar 29 | Jun 7 – Aug 9 | 70–90 |
| Valerian | — | — | Mar 29 | Aug 2 – Nov 8 | 120–180 |
| Yarrow | — | — | Mar 29 | Jun 28 – Sep 13 | 90–120 |
Monthly Planting Guide for Coos County
Gardening Guides & Resources
Helpful guides from The Ultimate Homestead to improve your garden in Coos County.
Frequently Asked Questions
What planting zone is Coos County, OR?
Coos County is in USDA Hardiness Zone 9a. 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 Coos County, OR?
Based on 31 years of NOAA weather station data, the median last spring frost in Coos County falls around March 22. In 8 out of 10 years, last frost lands between February 14 and April 22 — a 68-day window of variability. Use April 22 as your conservative safe-to-plant date for frost-sensitive crops.
When is the first fall frost in Coos County, OR?
The median first fall frost in Coos County arrives around November 19. In cold years it can arrive as early as October 18; in mild years as late as December 15. Harvest or protect frost-sensitive crops — tomatoes, peppers, basil, squash — before this date.
How long is the growing season in Coos County?
Coos County has a frost-free growing season of approximately 242 days. This long season supports multiple succession plantings and warm-season crops that need extended heat, like sweet potatoes and melons. Climate records show the growing season is trending shorter by about 4.05 days per decade.
What is the soil like in Coos County for gardening?
Coos County has predominantly Silt Loam soil with a pH range of 5.4–6.8 and Well Drained drainage. Most vegetables and herbs grow well with standard composting and seasonal soil amendment.
What is grown commercially in Coos County?
Coos County has commercial agriculture that includes Wheat, Hay, Potatoes, Cattle, Apples. These crops reflect the local climate and soil conditions — what succeeds commercially often translates well to home gardens in the same area.
Is Coos County a good location for home gardening?
Coos 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.
Your Coos County Garden Planner — Free
A 24-page printable planner built for Coos County (Zone 9a). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.
The Gardener's Encyclopedia to Companion Planting
The pairings that make vegetables, herbs, and flowers grow better — and the ones that quietly wreck a bed.
- Proven pairings for 200+ vegetables, herbs, flowers, and fruits
- Full seed-starting + planting schedule with timing and spacing
- Bonus: square-foot gardening guide + printable seasonal planners
Seed Saving & Storage Guide
Most saved seeds go bad before next season. This shows exactly when to pick, how to dry, and where to store seeds from 200 plants so yours don't.
- 200 plants, step-by-step: life cycle, pollination type, isolation
- Exact temperature + humidity ranges that keep seeds viable
- Bonus: searchable Google Sheets tracker + custom GPT assistant
Composting Guide for Homesteaders
Turn kitchen scraps and yard waste into compost that actually feeds the garden — instead of a pile that smells, attracts pests, and never breaks down.
- 14 sections on composting methods, soil science, and troubleshooting
- The 7-step hot-compost system from start to finish
- Bonus tools: troubleshooting chart, safety guide, monitoring log