Oswego County, NY — Planting Guide
Oswego County, New York gardeners: here's your May plan
A quick May briefing for Oswego County, New York gardeners — what's urgent, what's next, and what can wait.
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Time to transplant basil, cucumber, and kale
Harden off for 7 days — a little more sun each day — before planting. That's the difference between a seedling that thrives and one that stalls.
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Seed basil, cucumber, and green beans outdoors
Thin ruthlessly once seedlings are up. Crowded roots mean smaller crops from every plant.
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Bring in the radish, cress, and microgreens
Morning harvests are best — cooler temperatures mean crisper produce and longer fridge life.
To set up a strong June, finish these tasks
- Starting indoors: basil, cucumber, and kale
- First harvests: carrots, lettuce, and radish
Oswego County is in USDA Zone 5b. The average last spring frost is May 7 and the first fall frost is October 11, giving you a growing season of approximately 157 days.
At an elevation of 109 ft, Oswego County receives approximately 38.6 in of rainfall annually. Summer highs average 87°F with winter lows around 15°F. The predominant soil type is Silt Loam.
Based on 31 years of NOAA climate station data, the last frost date here varies by 22 days year to year — ranging from April 26 in warm years to May 18 in cold years. The growing season is trending longer by about 1.58 days per decade. Oswego County scores 68/100 (Good) on the Microclimate Index.
🌡️ Zone
5b (°F to °F min)
❄️ Last Frost
May 7
🍂 First Frost
October 11
📅 Growing Season
157 days
⛰️ Elevation
109 ft
🌧️ Annual Rainfall
38.6 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 | 2.8 in | 9 days | — | None |
| Feb | 2.7 in | 8 days | — | None |
| Mar | 3 in | 11 days | — | None |
| Apr | 3.1 in | 12 days | 1.2 in | Moderate |
| May | 3.9 in | 10 days | 0.4 in | Low |
| Jun | 3.9 in | 10 days | 0.4 in | Low |
| Jul | 4 in | 9 days | 0.3 in | Low |
| Aug | 3.2 in | 9 days | 1.1 in | Moderate |
| Sep | 2.8 in | 9 days | 1.5 in | Moderate |
| Oct | 3 in | 9 days | 1.3 in | Moderate |
| Nov | 3.1 in | 10 days | — | None |
| Dec | 2.9 in | 9 days | — | None |
Annual total: 38.4 in. Water needs vary by crop — tomatoes need ~1.2"/week while herbs like rosemary need only 0.3"/week. Check individual plant pages for crop-specific water budgets that factor in your county's rainfall and soil drainage.
Oswego County Soil Profile
Soil Type
Silt Loam
Soil pH
5.1-6.2
Drainage
Well Drained
Frost Risk Probability
Based on 31 years of NOAA weather station data from 3 stations
Beginners: Plant frost-sensitive crops (tomatoes, peppers, squash) after the "Safe" date on the left. Harvest or cover them before the "Protect by" date on the right. Hardy crops (lettuce, peas, kale) can go in the yellow transition zones.
How to read this table: "Conservative" means you're safe from frost 9 out of 10 years — best for beginners and frost-sensitive crops. "Average year" is the typical date. "Aggressive" means only 1 in 10 years is that warm — experienced gardeners with frost protection can try these dates.
| Planting Strategy | Last Spring Frost | First Fall Frost | Frost-Free Days |
|---|---|---|---|
| Conservative (safest) | May 18 | Oct 28 | 163 days |
| Cautious | May 12 | Oct 17 | 158 days |
| Average year | May 7 | Oct 11 | 157 days |
| Optimistic | Apr 29 | Oct 4 | 158 days |
| Aggressive (risky) | Apr 26 | Sep 23 | 150 days |
Not very — frost dates can vary by ±22 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 1.6 days per decade). Spring is arriving earlier than it used to. Good news for gardeners.
Gardening Difficulty Score
Oswego County offers good growing conditions. A little planning around frost dates goes a long way.
Local Gardening Help in Oswego 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 Oswego County's climate and soil.
County Extension Office
Oswego County Cornell Cooperative Extension Extension Office
Phone: 607-255-2237
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 Oswego County
Finding local nurseries & garden centers in Oswego County
Why Buy Local
Local nurseries carry plants that are proven to grow in your area. Staff can give you advice specific to Oswego 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 Oswego County NY" or "garden center Oswego 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 Oswego County NY" or check your extension office and local parks department. Facebook groups like "Oswego County Gardeners" or "New York 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
8.6 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 | 9.1 hr | 3.5 hr | Short day |
| February | 10.3 hr | 4.2 hr | Short day |
| March | 11.6 hr | 5.4 hr | Short day |
| April | 13.2 hr | 6.1 hr | Neutral |
| May | 14.5 hr | 7.5 hr | Long day |
| June | 15.2 hr | 8.5 hr | Long day |
| July | 14.9 hr | 8.6 hr | Long day |
| August | 13.8 hr | 7.8 hr | Neutral |
| September | 12.3 hr | 6.7 hr | Neutral |
| October | 10.8 hr | 5 hr | Short day |
| November | 9.4 hr | 3.7 hr | Short day |
| December | 8.8 hr | 3 hr | Short day |
Peak sun hours factor in typical cloud cover — use these for solar panel and shade-planning calculations.
Soil Temperature & Composting Calendar
Monthly soil temps tell you when to plant warm-season crops, and when your compost pile is actively working.
Plant Warm Crops When
Soil reaches 60°F+
Soil warm enough from May through 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 | 23°F | 30°F | ❄️ Dormant | ~36 weeks |
| Feb | 24°F | 29°F | ❄️ Dormant | ~36 weeks |
| Mar | 31°F | 35°F | ❄️ Dormant | ~36 weeks |
| Apr | 45°F | 45°F | 🐢 Slow | ~24 weeks |
| May | 60°F | 53°F | ♻️ Active | ~14 weeks |
| Jun | 71°F | 63°F | 🔥 Peak | ~8 weeks |
| Jul | 78°F | 70°F | 🔥 Peak | ~8 weeks |
| Aug | 77°F | 73°F | 🔥 Peak | ~8 weeks |
| Sep | 69°F | 70°F | 🔥 Peak | ~8 weeks |
| Oct | 57°F | 61°F | ♻️ Active | ~14 weeks |
| Nov | 44°F | 49°F | 🐢 Slow | ~24 weeks |
| Dec | 31°F | 36°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 Oswego 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
Moderate — watch for mildew and blight during wet periods.
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 | Moderate | Jul, Aug |
| Cabbage loopers | Low | May, Jun, Jul, Aug |
| Slugs | Low | Apr, May, Jun |
Organic pest management tips
- Use row covers on susceptible crops during peak pest months
- Apply neem oil preventatively every 7-14 days during active pest season
- Interplant with strong-scented herbs (basil, marigold) to confuse pests
- Hand-pick larger pests (beetles, caterpillars) in early morning when they're sluggish
- Practice crop rotation — never plant the same family in the same spot within 3 years
Cover Crops for Oswego 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 14 | Aug 9 | — | Rapid growth, attracts pollinators, suppresses weeds |
| Sorghum-sudan grass | May 13 | Aug 16 | — | Massive biomass, breaks compaction, suppresses nematodes |
| White clover | Apr 11 | Aug 9 | ✓ 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 30 | Sep 27 | — | 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 | Aug 18 | Apr 16 | ✓ Yes | Fixes nitrogen, good for heavy clay soils |
| Daikon radish | Aug 17 | Apr 23 | — | Deep taproot breaks compaction, excellent for clay soils |
| Hairy vetch | Jul 18 | Apr 16 | ✓ Yes | Excellent nitrogen fixer, good for depleted soils |
| Oats | Sep 10 | Apr 16 | — | Quick biomass, winterkills in cold zones — no spring tillage needed |
| Winter rye | Jul 14 | Apr 23 | — | Suppresses weeds, prevents erosion, breaks up compacted soil |
| Winter wheat | Jul 10 | Apr 23 | — | 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: 14 mph Summer: 8 mph
Fall: 10 mph Winter: 13 mph
Prevailing wind: W. Moderate wind — consider a temporary windbreak for young seedlings.
Windbreak Benefit
6.9/10
Moderately beneficial — a simple fence or trellis can protect delicate crops from wind stress.
Frost Pocket Risk
Moderate
Some terrain variation (629 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
19,138 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 750 gal tank.
Legal Status
Unrestricted
Rainwater harvesting is fully legal in your state with no restrictions.
Best Collection Months
May, Jun, Jul, Aug
Highest rainfall months — your barrels will fill up quickly during these months.
Months to Draw From Storage
Jan, Feb, Sep
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 38.4 inches of rain per year
- A 1,000 sq ft roof can collect roughly 19,138 gallons annually
- Rainwater harvesting is fully legal in your state
- Stock up on stored water before your dry season (Jan, Feb, Sep)
- Use a first-flush diverter to keep roof debris out of your collection
Soil & Growing Conditions in Oswego County
Soil Type
Silt Loam
Soil pH 5.1–6.2 · Moderately Well 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. (38.6 in. annual rainfall)
Season Tips
157-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.
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
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 Oswego County
106 vegetables that grow well in Zone 5b with planting dates for Oswego County.
Show all 106 vegetables with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Acorn Squash | Apr 2 | May 14 | May 21 | Aug 13 – Sep 17 | 80–100 |
| Amaranth | Mar 12 | May 14 | May 21 | Aug 20 – Oct 8 | 90–120 |
| Arugula | Apr 2 | Apr 23 | May 7 | Jun 11 – Aug 13 | 30–50 |
| Asparagus | — | — | May 21 | — | 730–1095 |
| Beets | — | Apr 23 | — | Jun 18 – Jul 16 | 50–70 |
| Belgian Endive | Apr 2 | Apr 23 | May 7 | Aug 27 – Oct 22 | 110–150 |
| Bitter Melon | Mar 12 | May 14 | May 21 | Jul 23 – Sep 3 | 60–90 |
| Black Beans | — | May 14 | — | Aug 13 – Oct 1 | 90–120 |
| Bok Choy | Apr 2 | Apr 23 | May 7 | Jun 18 – Jul 23 | 40–60 |
| Broccoli | Apr 2 | Apr 23 | May 7 | Jul 9 – Aug 20 | 60–90 |
| Broccoli Rabe | Apr 2 | Apr 23 | May 7 | Jun 18 – Jul 23 | 40–60 |
| Brussels Sprouts | Apr 2 | Apr 23 | May 7 | Aug 6 – Oct 1 | 90–130 |
| Butternut Squash | Apr 2 | May 14 | May 21 | Aug 20 – Sep 24 | 85–110 |
| Cabbage | Apr 2 | Apr 23 | May 7 | Jul 9 – Sep 3 | 60–100 |
| Calabash | Mar 12 | May 14 | May 21 | Aug 13 – Oct 8 | 80–120 |
| Carrots | — | Apr 23 | — | Jun 25 – Jul 30 | 60–80 |
| Cauliflower | Apr 2 | Apr 23 | May 7 | Jul 2 – Sep 3 | 55–100 |
| Celeriac | Apr 2 | Apr 23 | May 7 | Aug 20 – Sep 24 | 100–120 |
| Celery | Apr 2 | Apr 23 | May 7 | Jul 30 – Sep 24 | 80–120 |
| Celtuce | Apr 2 | Apr 23 | May 7 | Jul 9 – Aug 20 | 60–90 |
| Chard | Apr 2 | Apr 23 | May 7 | Jul 2 – Aug 20 | 50–60 |
| Chickpeas | Apr 2 | Apr 23 | May 7 | Jul 30 – Sep 10 | 80–110 |
| Chicory | Apr 2 | Apr 23 | May 7 | Jul 9 – Aug 20 | 60–85 |
| Chinese Cabbage | Apr 2 | Apr 23 | May 7 | Jul 2 – Jul 30 | 50–70 |
| Christmas Lima Beans | Mar 12 | May 14 | May 21 | Aug 13 – Sep 17 | 80–100 |
| Collard Greens | Apr 2 | Apr 23 | May 7 | Jul 2 – Sep 3 | 55–75 |
| Corn | — | May 14 | — | Jul 16 – Sep 10 | 60–100 |
| Cowpeas | — | May 14 | — | Jul 16 – Aug 27 | 60–90 |
| Cress | Apr 2 | Apr 23 | May 7 | May 21 – Jun 11 | 14–21 |
| Crookneck Squash | Apr 2 | May 14 | May 21 | Jul 9 – Aug 6 | 45–60 |
| Crosne | — | Apr 23 | — | Sep 24 – Oct 8 | 150–200 |
| Cucumber | Apr 2 | May 14 | May 21 | Jul 16 – Sep 10 | 50–70 |
| Daikon | — | Apr 23 | — | Jun 18 – Jul 16 | 50–70 |
| Delicata Squash | Apr 2 | May 14 | May 21 | Aug 13 – Sep 17 | 80–100 |
| Edamame | — | May 14 | — | Jul 30 – Sep 10 | 75–100 |
| Eggplant | Feb 26 | May 14 | May 21 | Jul 30 – Oct 1 | 65–85 |
| Endive | Apr 2 | Apr 23 | May 7 | Jun 25 – Jul 30 | 45–65 |
| Escarole | Apr 2 | Apr 23 | May 7 | Jul 2 – Jul 30 | 50–70 |
| Fava Beans | Apr 2 | Apr 23 | May 7 | Jul 23 – Sep 3 | 75–100 |
| Fennel | Mar 12 | May 14 | May 21 | Jul 23 – Sep 3 | 60–90 |
| Garlic | — | — | — | — | 90–240 |
| Green Beans | — | May 14 | — | Jul 9 – Sep 3 | 50–65 |
| Horseradish | — | — | May 21 | Sep 24 – Nov 5 | 120–180 |
| Hot Peppers | Feb 26 | May 14 | May 21 | Jul 30 – Nov 5 | 70–120 |
| Hubbard Squash | Apr 2 | May 14 | May 21 | Sep 3 – Oct 8 | 100–120 |
| Kabocha | Apr 2 | May 14 | May 21 | Aug 20 – Sep 17 | 85–100 |
| Kai Lan | Apr 2 | Apr 23 | May 7 | Jun 25 – Jul 23 | 45–60 |
| Kale | Apr 2 | Apr 23 | May 7 | Jul 2 – Aug 27 | 50–70 |
| Kidney Beans | — | May 14 | — | Aug 13 – Sep 17 | 85–110 |
| Kohlrabi | Apr 2 | Apr 23 | May 7 | Jun 25 – Jul 30 | 45–65 |
| Komatsuna | Apr 2 | Apr 23 | May 7 | Jun 11 – Jul 16 | 35–50 |
| Leeks | Apr 2 | Apr 23 | May 7 | Aug 6 – Oct 22 | 90–150 |
| Lentils | Apr 2 | Apr 23 | May 7 | Jul 30 – Sep 10 | 80–110 |
| Lettuce | Apr 2 | Apr 23 | May 7 | Jun 11 – Aug 20 | 30–60 |
| Lima Beans | — | May 14 | — | Jul 16 – Aug 27 | 60–90 |
| Mache | Apr 2 | Apr 23 | May 7 | Jun 18 – Jul 23 | 40–60 |
| Melon | Apr 2 | May 14 | May 21 | Jul 30 – Sep 17 | 70–100 |
| Microgreens | Apr 2 | Apr 23 | May 7 | May 14 – Jun 11 | 7–21 |
| Mitsuba | Apr 2 | Apr 23 | Apr 30 | Jun 25 – Aug 20 | 50–70 |
| Mizuna | Apr 2 | Apr 23 | May 7 | Jun 11 – Jul 9 | 30–45 |
| Mustard Greens | Apr 2 | Apr 23 | May 7 | Jun 11 – Aug 13 | 30–50 |
| Napa Cabbage | Apr 2 | Apr 23 | May 7 | Jul 2 – Aug 6 | 55–75 |
| New Zealand Spinach | Mar 12 | May 14 | May 21 | Jul 16 – Aug 13 | 55–70 |
| Okra | Mar 12 | May 14 | May 21 | Jul 16 – Sep 10 | 50–65 |
| Onion | Apr 2 | Apr 23 | May 7 | Aug 6 – Sep 24 | 90–120 |
| Pac Choi | Apr 2 | Apr 23 | May 7 | Jun 18 – Jul 16 | 40–55 |
| Parsnip | — | Apr 23 | — | Aug 6 – Sep 17 | 100–130 |
| Patty Pan Squash | Apr 2 | May 14 | May 21 | Jul 9 – Aug 6 | 45–60 |
| Peas | Apr 2 | Apr 23 | May 7 | Jul 2 – Aug 27 | 55–70 |
| Peppers | Feb 26 | May 14 | May 21 | Jul 23 – Oct 1 | 60–90 |
| Pole Beans | Mar 12 | May 14 | May 21 | Jul 16 – Sep 10 | 55–70 |
| Potatoes | Mar 12 | May 14 | May 21 | Jul 30 – Oct 8 | 70–120 |
| Pumpkin | Apr 2 | May 14 | May 21 | Aug 20 – Oct 8 | 85–120 |
| Purslane | Apr 2 | Apr 23 | May 7 | Jun 18 – Jul 23 | 40–60 |
| Radicchio | Apr 2 | Apr 23 | May 7 | Jul 9 – Aug 13 | 60–80 |
| Radish | — | Apr 23 | — | May 21 – Jun 11 | 22–35 |
| Rhubarb | — | — | May 28 | — | 365–730 |
| Romanesco | Apr 2 | Apr 23 | May 7 | Jul 23 – Sep 3 | 75–100 |
| Rutabaga | — | Apr 23 | — | Jul 16 – Aug 20 | 80–100 |
| Salsify | — | Apr 23 | — | Aug 6 – Sep 17 | 100–130 |
| Savoy Cabbage | Apr 2 | Apr 23 | May 7 | Jul 16 – Sep 10 | 70–110 |
| Scallions | Apr 2 | Apr 23 | May 7 | Jul 2 – Jul 30 | 50–70 |
| Scarlet Runner Beans | Mar 12 | May 14 | May 21 | Jul 23 – Aug 27 | 60–80 |
| Shallot | Apr 2 | Apr 23 | May 7 | Aug 6 – Sep 24 | 90–120 |
| Shiso | Mar 19 | May 14 | May 21 | Jul 16 – Sep 10 | 50–70 |
| Snap Peas | Mar 12 | May 14 | May 21 | Jul 16 – Sep 10 | 55–70 |
| Snow Peas | Apr 2 | Apr 23 | May 7 | Jul 2 – Aug 27 | 50–65 |
| Soybeans | — | May 14 | — | Aug 6 – Oct 1 | 80–120 |
| Spaghetti Squash | Apr 2 | May 14 | May 21 | Aug 20 – Sep 17 | 85–100 |
| Spinach | Apr 2 | Apr 23 | May 7 | Jun 11 – Aug 13 | 35–50 |
| Squash (Summer) | Apr 2 | May 14 | May 21 | Jul 9 – Sep 10 | 45–65 |
| Squash (Winter) | Apr 2 | May 14 | May 21 | Aug 13 – Oct 8 | 80–120 |
| Sunchoke | — | — | May 21 | Sep 10 – Nov 5 | 110–150 |
| Sunflower | Mar 12 | May 14 | May 21 | Jul 30 – Sep 17 | 70–100 |
| Sweet Corn | — | May 14 | — | Jul 16 – Aug 27 | 60–90 |
| Sweet Potatoes | Mar 12 | May 14 | May 21 | Aug 20 – Oct 8 | 90–120 |
| Tatsoi | Apr 2 | Apr 23 | May 7 | Jun 11 – Jul 16 | 35–50 |
| Tomatillo | Mar 12 | May 14 | May 21 | Jul 23 – Oct 1 | 60–85 |
| Tomatoes | Mar 12 | May 14 | May 21 | Jul 23 – Oct 1 | 60–85 |
| Turnip | — | Apr 23 | — | Jun 4 – Jul 9 | 40–60 |
| Watercress | Apr 2 | Apr 23 | May 7 | Jun 18 – Jul 23 | 40–60 |
| Watermelon | Apr 2 | May 14 | May 21 | Jul 30 – Sep 17 | 70–100 |
| Wax Beans | — | May 14 | — | Jul 9 – Sep 3 | 50–65 |
| Winter Melon | Mar 12 | May 14 | May 21 | Aug 20 – Oct 8 | 90–120 |
| Yard Long Beans | Mar 12 | May 14 | May 21 | Jul 16 – Aug 27 | 55–80 |
| Zucchini | Apr 2 | May 14 | May 21 | Jul 9 – Sep 3 | 45–60 |
🍓 Fruits to Grow in Oswego County
27 fruits that grow well in Zone 5b with planting dates for Oswego County.
Show all 27 fruits with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Alpine Strawberries | — | — | May 28 | Aug 27 – Nov 12 | 90–180 |
| Aronia | — | — | May 28 | — | 730–1095 |
| Blackberries | — | — | May 28 | — | 365–730 |
| Blueberries | — | — | May 28 | — | 730–1095 |
| Boysenberries | — | — | May 28 | — | 365–730 |
| Cantaloupe | — | — | May 28 | Aug 6 – Sep 10 | 70–90 |
| Che Fruit | — | — | May 28 | — | 1095–1825 |
| Cranberries | — | — | May 28 | — | 730–1095 |
| Currants | — | — | May 28 | — | 730–1095 |
| Elderberries | — | — | May 28 | — | 730–1095 |
| Goji Berries | — | — | May 28 | — | 730–1095 |
| Gooseberries | — | — | May 28 | — | 730–1095 |
| Grapes | — | — | May 28 | — | 730–1095 |
| Ground Cherry | — | — | May 28 | Aug 6 – Oct 1 | 65–80 |
| Hardy Kiwi | — | — | May 28 | — | 1095–1825 |
| Haskaps | — | — | May 28 | — | 730–1095 |
| Honeydew | — | — | May 28 | Aug 20 – Oct 1 | 80–110 |
| Jostaberry | — | — | May 28 | — | 730–1095 |
| Lingonberries | — | — | May 28 | — | 730–1095 |
| Medlar | — | — | May 28 | — | 1095–1825 |
| Mulberries | — | — | May 28 | — | 730–1825 |
| Pawpaw | — | — | May 28 | — | 1095–2555 |
| Persimmon | — | — | May 28 | — | 1095–2555 |
| Quince | — | — | May 28 | — | 1095–1825 |
| Raspberries | — | — | May 28 | — | 365–730 |
| Serviceberries | — | — | May 28 | — | 730–1095 |
| Strawberries | — | — | May 28 | Aug 27 – Nov 12 | 90–365 |
🌿 Herbs to Grow in Oswego County
37 herbs that grow well in Zone 5b with planting dates for Oswego County.
Show all 37 herbs with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Angelica | Apr 2 | Apr 23 | Apr 30 | — | 365–730 |
| Anise | Apr 2 | Apr 23 | Apr 30 | Jul 30 – Oct 15 | 90–120 |
| Basil | Mar 19 | May 14 | May 21 | Jul 16 – Sep 17 | 50–75 |
| Bee Balm | — | — | May 14 | Aug 13 – Oct 29 | 90–120 |
| Borage | Apr 2 | Apr 23 | Apr 30 | Jun 25 – Aug 13 | 50–60 |
| Caraway | Apr 2 | Apr 23 | Apr 30 | — | 365–450 |
| Catnip | — | — | May 14 | Jul 16 – Sep 17 | 60–80 |
| Chamomile | Apr 2 | Apr 23 | Apr 30 | Jul 2 – Sep 10 | 60–90 |
| Chervil | Apr 2 | Apr 23 | Apr 30 | Jun 11 – Aug 13 | 40–60 |
| Chives | — | — | May 14 | Jul 16 – Sep 24 | 60–90 |
| Cilantro | Apr 2 | Apr 23 | Apr 30 | Jun 11 – Aug 13 | 40–60 |
| Comfrey | — | — | May 14 | Jul 16 – Sep 24 | 60–90 |
| Cumin | Apr 2 | Apr 23 | Apr 30 | Aug 13 – Oct 15 | 100–120 |
| Dill | Apr 2 | Apr 23 | Apr 30 | Jun 11 – Aug 13 | 40–60 |
| Echinacea | — | — | May 14 | Sep 17 – Oct 29 | 120–180 |
| Epazote | Mar 19 | May 14 | May 21 | Jul 9 – Sep 3 | 45–60 |
| Fennel (herb) | Apr 2 | Apr 23 | Apr 30 | Jul 2 – Sep 10 | 60–90 |
| Feverfew | — | — | May 14 | Aug 13 – Oct 29 | 90–120 |
| Garlic Chives | — | — | May 14 | Jul 16 – Sep 24 | 60–90 |
| Horehound | — | — | May 14 | Jul 30 – Sep 24 | 75–90 |
| Hyssop | — | — | May 14 | Jul 23 – Sep 24 | 70–90 |
| Lavender | — | — | May 14 | Aug 13 – Oct 29 | 90–200 |
| Lemon Balm | — | — | May 14 | Jul 16 – Sep 3 | 60–70 |
| Lemon Thyme | — | — | May 14 | Jul 23 – Sep 24 | 70–90 |
| Lovage | — | — | May 14 | Jul 23 – Sep 24 | 70–90 |
| Mint | — | — | May 14 | Jul 16 – Sep 24 | 60–90 |
| Oregano | — | — | May 14 | Jul 16 – Sep 24 | 60–90 |
| Parsley | Apr 2 | Apr 23 | Apr 30 | Jul 2 – Sep 3 | 60–80 |
| Rue | — | — | May 14 | Jul 23 – Sep 24 | 70–90 |
| Sage | — | — | May 14 | Jul 30 – Sep 24 | 75–90 |
| Savory | — | — | May 14 | Jul 9 – Sep 3 | 50–70 |
| Sorrel | Apr 2 | Apr 23 | Apr 30 | Jun 11 – Aug 13 | 40–60 |
| Tarragon | — | — | May 14 | Jul 16 – Sep 24 | 60–90 |
| Thai Basil | Mar 19 | May 14 | May 21 | Jul 16 – Sep 17 | 50–75 |
| Thyme | — | — | May 14 | Jul 23 – Sep 24 | 70–90 |
| Valerian | — | — | May 14 | Sep 17 – Oct 29 | 120–180 |
| Yarrow | — | — | May 14 | Aug 13 – Oct 29 | 90–120 |
Monthly Planting Guide for Oswego County
Gardening Guides & Resources
Helpful guides from The Ultimate Homestead to improve your garden in Oswego County.
Frequently Asked Questions
What planting zone is Oswego County, NY?
Oswego County is in USDA Hardiness Zone 5b. 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 Oswego County, NY?
Based on 31 years of NOAA weather station data, the median last spring frost in Oswego County falls around May 7. In 8 out of 10 years, last frost lands between April 26 and May 18 — a 22-day window of variability. Use May 18 as your conservative safe-to-plant date for frost-sensitive crops.
When is the first fall frost in Oswego County, NY?
The median first fall frost in Oswego County arrives around October 11. In cold years it can arrive as early as September 23; in mild years as late as October 28. Harvest or protect frost-sensitive crops — tomatoes, peppers, basil, squash — before this date.
How long is the growing season in Oswego County?
Oswego County has a frost-free growing season of approximately 157 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 1.58 days per decade.
What is the soil like in Oswego County for gardening?
Oswego County has predominantly Silt Loam soil with a pH range of 5.1–6.2 and Moderately Well Drained drainage. Most vegetables and herbs grow well with standard composting and seasonal soil amendment.
What is grown commercially in Oswego County?
Oswego County has commercial agriculture that includes Hay, Dairy, Corn, Apples, Sweet Corn. These crops reflect the local climate and soil conditions — what succeeds commercially often translates well to home gardens in the same area.
Is Oswego County a good location for home gardening?
Oswego County scores 68/100 (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 Oswego County Garden Planner — Free
A 24-page printable planner built for Oswego County (Zone 5b). 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