Marion County, OR — Planting Guide
Marion County is in USDA Zone 8a. The average last spring frost is April 20 and the first fall frost is October 30, giving you a growing season of approximately 193 days.
At an elevation of 422 ft, Marion County receives approximately 50.5 in of rainfall annually. Summer highs average 88°F with winter lows around 41°F. The predominant soil type is Silt Loam.
Based on 31 years of NOAA climate station data, the last frost date here varies by 44 days year to year — ranging from March 25 in warm years to May 9 in cold years. The growing season is trending longer by about 1.7 days per decade. Marion County scores 66/100 (Good) on the Microclimate Index.
🌡️ Zone
8a (10°F to 15°F min)
❄️ Last Frost
April 20
🍂 First Frost
October 30
📅 Growing Season
193 days
⛰️ Elevation
422 ft
🌧️ Annual Rainfall
50.5 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 | 6.9 in | 20 days | — | None |
| Feb | 5.1 in | 13 days | — | Low |
| Mar | 4.9 in | 13 days | — | Low |
| Apr | 3.8 in | 11 days | 0.5 in | Low |
| May | 2.8 in | 10 days | 1.5 in | Moderate |
| Jun | 2 in | 6 days | 2.3 in | High |
| Jul | 0.8 in | 3 days | 3.5 in | Critical |
| Aug | 1 in | 3 days | 3.3 in | Critical |
| Sep | 1.9 in | 5 days | 2.4 in | High |
| Oct | 4.2 in | 10 days | 0.1 in | Low |
| Nov | 8.2 in | 14 days | — | Low |
| Dec | 9 in | 17 days | — | None |
Annual total: 50.6 in. Gardens typically need ~1 inch of water per week during the growing season. Months marked "None" for extra water are outside the active growing season for your zone — most gardens are dormant and don't need irrigation during those months.
Marion 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) | May 9 | Nov 24 | 199 days |
| Cautious | Apr 29 | Nov 8 | 193 days |
| Average year | Apr 20 | Oct 30 | 193 days |
| Optimistic | Apr 13 | Oct 25 | 195 days |
| Aggressive (risky) | Mar 25 | Oct 10 | 199 days |
Not very — frost dates can vary by ±44 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 1.7 days per decade). Spring is arriving earlier than it used to. Good news for gardeners.
Gardening Difficulty Score
Marion County offers good growing conditions. A little planning around frost dates goes a long way.
Local Gardening Help in Marion 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 Marion County's climate and soil.
County Extension Office
Marion 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 Marion County
Finding local nurseries & garden centers in Marion County
Why Buy Local
Local nurseries carry plants that are proven to grow in your area. Staff can give you advice specific to Marion 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 Marion County OR" or "garden center Marion 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 Marion County OR" or check your extension office and local parks department. Facebook groups like "Marion 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
15.4 hours
Summer solstice daylight
Shortest Day
8.6 hours
Winter solstice daylight
Peak Sun Hours
10.6 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 hr | 2.2 hr | Short day |
| February | 10.2 hr | 3.2 hr | Short day |
| March | 11.6 hr | 3.9 hr | Short day |
| April | 13.3 hr | 5.4 hr | Neutral |
| May | 14.6 hr | 7.2 hr | Long day |
| June | 15.4 hr | 8.1 hr | Long day |
| July | 15.1 hr | 10.6 hr | Long day |
| August | 13.9 hr | 9.1 hr | Neutral |
| September | 12.3 hr | 7 hr | Neutral |
| October | 10.7 hr | 4.2 hr | Short day |
| November | 9.3 hr | 2.3 hr | Short day |
| December | 8.6 hr | 1.9 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 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 | 43°F | 52°F | 🐢 Slow | ~24 weeks |
| Feb | 43°F | 49°F | 🐢 Slow | ~24 weeks |
| Mar | 51°F | 52°F | ♻️ Active | ~14 weeks |
| Apr | 61°F | 60°F | ♻️ Active | ~14 weeks |
| May | 70°F | 69°F | 🔥 Peak | ~8 weeks |
| Jun | 81°F | 76°F | 🔥 Peak | ~8 weeks |
| Jul | 88°F | 84°F | 🔥 Peak | ~8 weeks |
| Aug | 91°F | 86°F | 🔥 Peak | ~8 weeks |
| Sep | 83°F | 83°F | 🔥 Peak | ~8 weeks |
| Oct | 72°F | 74°F | 🔥 Peak | ~8 weeks |
| Nov | 60°F | 64°F | ♻️ Active | ~14 weeks |
| Dec | 50°F | 56°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 Marion 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 | High | Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov |
| Squash vine borers | Moderate | 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 Marion County
Cover crops protect bare soil, fix nitrogen, suppress weeds, and improve soil structure — with county-specific planting dates.
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 2 | Mar 30 | ✓ Yes | Fixes nitrogen, good for heavy clay soils |
| Crimson clover | Aug 27 | Apr 6 | ✓ Yes | Fixes nitrogen, attracts pollinators in spring |
| Daikon radish | Sep 1 | Apr 6 | — | Deep taproot breaks compaction, excellent for clay soils |
| Hairy vetch | Aug 13 | Apr 6 | ✓ Yes | Excellent nitrogen fixer, good for depleted soils |
| Oats | Sep 25 | Mar 30 | — | Quick biomass, winterkills in cold zones — no spring tillage needed |
| Winter rye | Aug 4 | Apr 6 | — | Suppresses weeds, prevents erosion, breaks up compacted soil |
| Winter wheat | Jul 24 | Apr 6 | — | Erosion control, weed suppression, good biomass |
Spring Cover Crops (4 options) — Build soil before the main growing season
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Buckwheat | Apr 25 | Aug 21 | — | Rapid growth, attracts pollinators, suppresses weeds |
| Cowpeas (southern peas) | Apr 29 | Sep 4 | ✓ Yes | Excellent nitrogen fixer for warm climates, edible |
| Sorghum-sudan grass | Apr 22 | Aug 21 | — | Massive biomass, breaks compaction, suppresses nematodes |
| White clover | Mar 21 | Aug 28 | ✓ 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 21 | Oct 9 | — | Deep roots break compaction, attract pollinators and beneficial insects |
Wind & Microclimate
Wind dries soil, stresses plants, and affects frost patterns. Understanding your exposure helps with garden placement.
Seasonal Wind Speed
Spring: 11 mph Summer: 10 mph
Fall: 8 mph Winter: 12 mph
Prevailing wind: SW. Moderate wind — consider a temporary windbreak for young seedlings.
Windbreak Benefit
4.9/10
Moderately beneficial — a simple fence or trellis can protect delicate crops from wind stress.
Frost Pocket Risk
Low
Relatively flat terrain (280 ft range). Frost pocket risk is minimal — garden placement is flexible.
Rainwater Harvesting Potential
How much water you can collect, when to collect it, and what size system you need for your garden.
Annual Collection
25,219 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 1,000 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
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 50.6 inches of rain per year
- A 1,000 sq ft roof can collect roughly 25,219 gallons annually
- Rainwater harvesting is fully legal in your state
- Your area gets ample rainfall — even small barrels make a big difference
- Consider a rain garden to handle overflow during heavy rainfall months
Soil & Growing Conditions in Marion 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
Marion County has very low drought pressure. Natural rainfall usually meets garden needs — water only during extended dry spells.
Season Tips
193-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 Marion County
115 vegetables that grow well in Zone 8a with planting dates for Marion County.
Show all 115 vegetables with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Acorn Squash | Mar 23 | Apr 27 | May 4 | Jul 27 – Aug 31 | 80–100 |
| Amaranth | Mar 2 | Apr 27 | May 4 | Aug 3 – Sep 21 | 90–120 |
| Artichoke | — | — | May 4 | Sep 7 – Nov 16 | 120–180 |
| Arugula | Mar 16 | Apr 6 | Apr 20 | May 25 – Jul 27 | 30–50 |
| Asparagus | — | — | May 4 | — | 730–1095 |
| Beets | — | Apr 6 | — | Jun 1 – Jun 29 | 50–70 |
| Belgian Endive | Mar 16 | Apr 6 | Apr 20 | Aug 10 – Oct 5 | 110–150 |
| Bitter Melon | Mar 2 | Apr 27 | May 4 | Jul 6 – Aug 17 | 60–90 |
| Black Beans | — | Apr 27 | — | Jul 27 – Sep 14 | 90–120 |
| Bok Choy | Mar 16 | Apr 6 | Apr 20 | Jun 1 – Jul 6 | 40–60 |
| Broccoli | Mar 16 | Apr 6 | Apr 20 | Jun 22 – Aug 3 | 60–90 |
| Broccoli Rabe | Mar 16 | Apr 6 | Apr 20 | Jun 1 – Jul 6 | 40–60 |
| Brussels Sprouts | Mar 16 | Apr 6 | Apr 20 | Jul 20 – Sep 14 | 90–130 |
| Butternut Squash | Mar 23 | Apr 27 | May 4 | Aug 3 – Sep 7 | 85–110 |
| Cabbage | Mar 16 | Apr 6 | Apr 20 | Jun 22 – Aug 17 | 60–100 |
| Calabash | Mar 2 | Apr 27 | May 4 | Jul 27 – Sep 21 | 80–120 |
| Cardoon | — | — | May 4 | Sep 7 – Oct 19 | 120–150 |
| Carrots | — | Apr 6 | — | Jun 8 – Jul 13 | 60–80 |
| Cauliflower | Mar 16 | Apr 6 | Apr 20 | Jun 15 – Aug 17 | 55–100 |
| Celeriac | Mar 16 | Apr 6 | Apr 20 | Aug 3 – Sep 7 | 100–120 |
| Celery | Mar 16 | Apr 6 | Apr 20 | Jul 13 – Sep 7 | 80–120 |
| Celtuce | Mar 16 | Apr 6 | Apr 20 | Jun 22 – Aug 3 | 60–90 |
| Chard | Mar 16 | Apr 6 | Apr 20 | Jun 15 – Aug 3 | 50–60 |
| Chayote | Mar 2 | Apr 27 | May 4 | Sep 7 – Nov 16 | 120–180 |
| Chickpeas | Mar 16 | Apr 6 | Apr 20 | Jul 13 – Aug 24 | 80–110 |
| Chicory | Mar 16 | Apr 6 | Apr 20 | Jun 22 – Aug 3 | 60–85 |
| Chinese Cabbage | Mar 16 | Apr 6 | Apr 20 | Jun 15 – Jul 13 | 50–70 |
| Christmas Lima Beans | Mar 2 | Apr 27 | May 4 | Jul 27 – Aug 31 | 80–100 |
| Collard Greens | Mar 16 | Apr 6 | Apr 20 | Jun 15 – Aug 17 | 55–75 |
| Corn | — | Apr 27 | — | Jun 29 – Aug 24 | 60–100 |
| Cowpeas | — | Apr 27 | — | Jun 29 – Aug 10 | 60–90 |
| Cress | Mar 16 | Apr 6 | Apr 20 | May 4 – May 25 | 14–21 |
| Crookneck Squash | Mar 23 | Apr 27 | May 4 | Jun 22 – Jul 20 | 45–60 |
| Crosne | — | Apr 6 | — | Sep 7 – Nov 9 | 150–200 |
| Cucumber | Mar 23 | Apr 27 | May 4 | Jun 29 – Aug 24 | 50–70 |
| Daikon | — | Apr 6 | — | Jun 1 – Jun 29 | 50–70 |
| Delicata Squash | Mar 23 | Apr 27 | May 4 | Jul 27 – Aug 31 | 80–100 |
| Edamame | — | Apr 27 | — | Jul 13 – Aug 24 | 75–100 |
| Eggplant | Feb 16 | Apr 27 | May 4 | Jul 13 – Sep 14 | 65–85 |
| Endive | Mar 16 | Apr 6 | Apr 20 | Jun 8 – Jul 13 | 45–65 |
| Escarole | Mar 16 | Apr 6 | Apr 20 | Jun 15 – Jul 13 | 50–70 |
| Fava Beans | Mar 16 | Apr 6 | Apr 20 | Jul 6 – Aug 17 | 75–100 |
| Fennel | Mar 2 | Apr 27 | May 4 | Jul 6 – Aug 17 | 60–90 |
| Garlic | — | — | — | — | 90–240 |
| Ginger | Mar 2 | Apr 27 | May 4 | Jan 4 – Jan 18 | 240–300 |
| Green Beans | — | Apr 27 | — | Jun 22 – Aug 17 | 50–65 |
| Horseradish | — | — | May 4 | Sep 7 – Nov 16 | 120–180 |
| Hot Peppers | Feb 16 | Apr 27 | May 4 | Jul 13 – Oct 19 | 70–120 |
| Hubbard Squash | Mar 23 | Apr 27 | May 4 | Aug 17 – Sep 21 | 100–120 |
| Jicama | Mar 2 | Apr 27 | May 4 | Sep 7 – Nov 16 | 120–180 |
| Kabocha | Mar 23 | Apr 27 | May 4 | Aug 3 – Aug 31 | 85–100 |
| Kai Lan | Mar 16 | Apr 6 | Apr 20 | Jun 8 – Jul 6 | 45–60 |
| Kale | Mar 16 | Apr 6 | Apr 20 | Jun 15 – Aug 10 | 50–70 |
| Kidney Beans | — | Apr 27 | — | Jul 27 – Aug 31 | 85–110 |
| Kohlrabi | Mar 16 | Apr 6 | Apr 20 | Jun 8 – Jul 13 | 45–65 |
| Komatsuna | Mar 16 | Apr 6 | Apr 20 | May 25 – Jun 29 | 35–50 |
| Leeks | Mar 16 | Apr 6 | Apr 20 | Jul 20 – Oct 5 | 90–150 |
| Lentils | Mar 16 | Apr 6 | Apr 20 | Jul 13 – Aug 24 | 80–110 |
| Lettuce | Mar 16 | Apr 6 | Apr 20 | May 25 – Aug 3 | 30–60 |
| Lima Beans | — | Apr 27 | — | Jun 29 – Aug 10 | 60–90 |
| Loofah | Mar 2 | Apr 27 | May 4 | Aug 17 – Oct 19 | 100–150 |
| Luffa | Mar 2 | Apr 27 | May 4 | Aug 3 – Oct 19 | 90–150 |
| Mache | Mar 16 | Apr 6 | Apr 20 | Jun 1 – Jul 6 | 40–60 |
| Malabar Spinach | Mar 2 | Apr 27 | May 4 | Jun 29 – Jul 27 | 55–70 |
| Melon | Mar 23 | Apr 27 | May 4 | Jul 13 – Aug 31 | 70–100 |
| Microgreens | Mar 16 | Apr 6 | Apr 20 | Apr 27 – May 25 | 7–21 |
| Mitsuba | Mar 16 | Apr 6 | Apr 13 | Jun 8 – Aug 3 | 50–70 |
| Mizuna | Mar 16 | Apr 6 | Apr 20 | May 25 – Jun 22 | 30–45 |
| Mustard Greens | Mar 16 | Apr 6 | Apr 20 | May 25 – Jul 27 | 30–50 |
| Napa Cabbage | Mar 16 | Apr 6 | Apr 20 | Jun 15 – Jul 20 | 55–75 |
| New Zealand Spinach | Mar 2 | Apr 27 | May 4 | Jun 29 – Jul 27 | 55–70 |
| Okra | Mar 2 | Apr 27 | May 4 | Jun 29 – Aug 24 | 50–65 |
| Onion | Mar 16 | Apr 6 | Apr 20 | Jul 20 – Sep 7 | 90–120 |
| Pac Choi | Mar 16 | Apr 6 | Apr 20 | Jun 1 – Jun 29 | 40–55 |
| Parsnip | — | Apr 6 | — | Jul 20 – Aug 31 | 100–130 |
| Patty Pan Squash | Mar 23 | Apr 27 | May 4 | Jun 22 – Jul 20 | 45–60 |
| Peas | Mar 16 | Apr 6 | Apr 20 | Jun 15 – Aug 10 | 55–70 |
| Peppers | Feb 16 | Apr 27 | May 4 | Jul 6 – Sep 14 | 60–90 |
| Pole Beans | Mar 2 | Apr 27 | May 4 | Jun 29 – Aug 24 | 55–70 |
| Potatoes | Mar 2 | Apr 27 | May 4 | Jul 13 – Sep 21 | 70–120 |
| Pumpkin | Mar 23 | Apr 27 | May 4 | Aug 3 – Sep 21 | 85–120 |
| Purslane | Mar 16 | Apr 6 | Apr 20 | Jun 1 – Jul 6 | 40–60 |
| Radicchio | Mar 16 | Apr 6 | Apr 20 | Jun 22 – Jul 27 | 60–80 |
| Radish | — | Apr 6 | — | May 4 – May 25 | 22–35 |
| Rhubarb | — | — | May 11 | — | 365–730 |
| Romanesco | Mar 16 | Apr 6 | Apr 20 | Jul 6 – Aug 17 | 75–100 |
| Rutabaga | — | Apr 6 | — | Jun 29 – Aug 3 | 80–100 |
| Salsify | — | Apr 6 | — | Jul 20 – Aug 31 | 100–130 |
| Savoy Cabbage | Mar 16 | Apr 6 | Apr 20 | Jun 29 – Aug 24 | 70–110 |
| Scallions | Mar 16 | Apr 6 | Apr 20 | Jun 15 – Jul 13 | 50–70 |
| Scarlet Runner Beans | Mar 2 | Apr 27 | May 4 | Jul 6 – Aug 10 | 60–80 |
| Shallot | Mar 16 | Apr 6 | Apr 20 | Jul 20 – Sep 7 | 90–120 |
| Shiso | Mar 2 | Apr 27 | May 4 | Jun 29 – Aug 24 | 50–70 |
| Snap Peas | Mar 2 | Apr 27 | May 4 | Jun 29 – Aug 24 | 55–70 |
| Snow Peas | Mar 16 | Apr 6 | Apr 20 | Jun 15 – Aug 10 | 50–65 |
| Soybeans | — | Apr 27 | — | Jul 20 – Sep 14 | 80–120 |
| Spaghetti Squash | Mar 23 | Apr 27 | May 4 | Aug 3 – Aug 31 | 85–100 |
| Spinach | Mar 16 | Apr 6 | Apr 20 | May 25 – Jul 27 | 35–50 |
| Squash (Summer) | Mar 23 | Apr 27 | May 4 | Jun 22 – Aug 24 | 45–65 |
| Squash (Winter) | Mar 23 | Apr 27 | May 4 | Jul 27 – Sep 21 | 80–120 |
| Sunchoke | — | — | May 4 | Aug 24 – Oct 19 | 110–150 |
| Sunflower | Mar 2 | Apr 27 | May 4 | Jul 13 – Aug 31 | 70–100 |
| Sweet Corn | — | Apr 27 | — | Jun 29 – Aug 10 | 60–90 |
| Sweet Potatoes | Mar 2 | Apr 27 | May 4 | Aug 3 – Sep 21 | 90–120 |
| Tatsoi | Mar 16 | Apr 6 | Apr 20 | May 25 – Jun 29 | 35–50 |
| Tomatillo | Mar 2 | Apr 27 | May 4 | Jul 6 – Sep 14 | 60–85 |
| Tomatoes | Mar 2 | Apr 27 | May 4 | Jul 6 – Sep 14 | 60–85 |
| Turmeric | Mar 2 | Apr 27 | May 4 | Jan 4 – Jan 18 | 240–300 |
| Turnip | — | Apr 6 | — | May 18 – Jun 22 | 40–60 |
| Watercress | Mar 16 | Apr 6 | Apr 20 | Jun 1 – Jul 6 | 40–60 |
| Watermelon | Mar 23 | Apr 27 | May 4 | Jul 13 – Aug 31 | 70–100 |
| Wax Beans | — | Apr 27 | — | Jun 22 – Aug 17 | 50–65 |
| Winter Melon | Mar 2 | Apr 27 | May 4 | Aug 3 – Sep 21 | 90–120 |
| Yard Long Beans | Mar 2 | Apr 27 | May 4 | Jun 29 – Aug 10 | 55–80 |
| Zucchini | Mar 23 | Apr 27 | May 4 | Jun 22 – Aug 17 | 45–60 |
🍓 Fruits to Grow in Marion County
27 fruits that grow well in Zone 8a with planting dates for Marion County.
Show all 27 fruits with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Alpine Strawberries | — | — | May 11 | Aug 10 – Nov 23 | 90–180 |
| Aronia | — | — | May 11 | — | 730–1095 |
| Blackberries | — | — | May 11 | — | 365–730 |
| Blueberries | — | — | May 11 | — | 730–1095 |
| Boysenberries | — | — | May 11 | — | 365–730 |
| Cantaloupe | — | — | May 11 | Jul 20 – Aug 24 | 70–90 |
| Che Fruit | — | — | May 11 | — | 1095–1825 |
| Elderberries | — | — | May 11 | — | 730–1095 |
| Figs | — | — | May 11 | — | 730–1825 |
| Goji Berries | — | — | May 11 | — | 730–1095 |
| Gooseberries | — | — | May 11 | — | 730–1095 |
| Grapes | — | — | May 11 | — | 730–1095 |
| Ground Cherry | — | — | May 11 | Jul 20 – Sep 14 | 65–80 |
| Hardy Kiwi | — | — | May 11 | — | 1095–1825 |
| Honeydew | — | — | May 11 | Aug 3 – Sep 14 | 80–110 |
| Jostaberry | — | — | May 11 | — | 730–1095 |
| Kiwi | — | — | May 11 | — | 1095–1825 |
| Loquat | — | — | May 11 | — | 730–1825 |
| Medlar | — | — | May 11 | — | 1095–1825 |
| Mulberries | — | — | May 11 | — | 730–1825 |
| Pawpaw | — | — | May 11 | — | 1095–2555 |
| Persimmon | — | — | May 11 | — | 1095–2555 |
| Pomegranate | — | — | May 11 | — | 730–1095 |
| Quince | — | — | May 11 | — | 1095–1825 |
| Raspberries | — | — | May 11 | — | 365–730 |
| Serviceberries | — | — | May 11 | — | 730–1095 |
| Strawberries | — | — | May 11 | Aug 10 – Jan 25 | 90–365 |
🌿 Herbs to Grow in Marion County
42 herbs that grow well in Zone 8a with planting dates for Marion County.
Show all 42 herbs with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Angelica | Mar 16 | Apr 6 | Apr 13 | — | 365–730 |
| Anise | Mar 16 | Apr 6 | Apr 13 | Jul 13 – Sep 28 | 90–120 |
| Basil | Mar 2 | Apr 27 | May 4 | Jun 29 – Aug 31 | 50–75 |
| Bee Balm | — | — | Apr 27 | Jul 27 – Oct 12 | 90–120 |
| Borage | Mar 16 | Apr 6 | Apr 13 | Jun 8 – Jul 27 | 50–60 |
| Caraway | Mar 16 | Apr 6 | Apr 13 | — | 365–450 |
| Catnip | — | — | Apr 27 | Jun 29 – Aug 31 | 60–80 |
| Chamomile | Mar 16 | Apr 6 | Apr 13 | Jun 15 – Aug 24 | 60–90 |
| Chervil | Mar 16 | Apr 6 | Apr 13 | May 25 – Jul 27 | 40–60 |
| Chives | — | — | Apr 27 | Jun 29 – Sep 7 | 60–90 |
| Cilantro | Mar 16 | Apr 6 | Apr 13 | May 25 – Jul 27 | 40–60 |
| Comfrey | — | — | Apr 27 | Jun 29 – Sep 7 | 60–90 |
| Cumin | Mar 16 | Apr 6 | Apr 13 | Jul 27 – Sep 28 | 100–120 |
| Dill | Mar 16 | Apr 6 | Apr 13 | May 25 – Jul 27 | 40–60 |
| Echinacea | — | — | Apr 27 | Aug 31 – Dec 7 | 120–180 |
| Epazote | Mar 2 | Apr 27 | May 4 | Jun 22 – Aug 17 | 45–60 |
| Fennel (herb) | Mar 16 | Apr 6 | Apr 13 | Jun 15 – Aug 24 | 60–90 |
| Feverfew | — | — | Apr 27 | Jul 27 – Oct 12 | 90–120 |
| Garlic Chives | — | — | Apr 27 | Jun 29 – Sep 7 | 60–90 |
| Horehound | — | — | Apr 27 | Jul 13 – Sep 7 | 75–90 |
| Hyssop | — | — | Apr 27 | Jul 6 – Sep 7 | 70–90 |
| Lavender | — | — | Apr 27 | Jul 27 – Dec 28 | 90–200 |
| Lemon Balm | — | — | Apr 27 | Jun 29 – Aug 17 | 60–70 |
| Lemon Thyme | — | — | Apr 27 | Jul 6 – Sep 7 | 70–90 |
| Lemon Verbena | Mar 2 | Apr 27 | May 4 | Jul 6 – Sep 14 | 60–90 |
| Lemongrass | Mar 2 | Apr 27 | May 4 | Jul 20 – Oct 19 | 75–120 |
| Lovage | — | — | Apr 27 | Jul 6 – Sep 7 | 70–90 |
| Marjoram | — | — | Apr 27 | Jun 29 – Sep 7 | 60–90 |
| Mint | — | — | Apr 27 | Jun 29 – Sep 7 | 60–90 |
| Oregano | — | — | Apr 27 | Jun 29 – Sep 7 | 60–90 |
| Parsley | Mar 16 | Apr 6 | Apr 13 | Jun 15 – Aug 17 | 60–80 |
| Rosemary | — | — | Apr 27 | Jul 20 – Dec 7 | 80–180 |
| Rue | — | — | Apr 27 | Jul 6 – Sep 7 | 70–90 |
| Sage | — | — | Apr 27 | Jul 13 – Sep 7 | 75–90 |
| Savory | — | — | Apr 27 | Jun 22 – Aug 17 | 50–70 |
| Sorrel | Mar 16 | Apr 6 | Apr 13 | May 25 – Jul 27 | 40–60 |
| Stevia | Mar 2 | Apr 27 | May 4 | Jul 6 – Sep 14 | 60–90 |
| Tarragon | — | — | Apr 27 | Jun 29 – Sep 7 | 60–90 |
| Thai Basil | Mar 2 | Apr 27 | May 4 | Jun 29 – Aug 31 | 50–75 |
| Thyme | — | — | Apr 27 | Jul 6 – Sep 7 | 70–90 |
| Valerian | — | — | Apr 27 | Aug 31 – Dec 7 | 120–180 |
| Yarrow | — | — | Apr 27 | Jul 27 – Oct 12 | 90–120 |
Monthly Planting Guide for Marion County
Gardening Guides & Resources
Helpful guides from The Ultimate Homestead to improve your garden in Marion County.
Frequently Asked Questions
What planting zone is Marion County, OR?
Marion County is in USDA Hardiness Zone 8a. 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 Marion County, OR?
Based on 31 years of NOAA weather station data, the median last spring frost in Marion County falls around April 20. In 8 out of 10 years, last frost lands between March 25 and May 9 — a 44-day window of variability. Use May 9 as your conservative safe-to-plant date for frost-sensitive crops.
When is the first fall frost in Marion County, OR?
The median first fall frost in Marion County arrives around October 30. In cold years it can arrive as early as October 10; in mild years as late as November 24. Harvest or protect frost-sensitive crops — tomatoes, peppers, basil, squash — before this date.
How long is the growing season in Marion County?
Marion County has a frost-free growing season of approximately 193 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 longer by about 1.7 days per decade.
What is the soil like in Marion County for gardening?
Marion 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 Marion County?
Marion County has commercial agriculture that includes Hay, 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 Marion County a good location for home gardening?
Marion County scores 66/100 (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 Marion County gardeners in Zone 8a 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.
