Grant County, OK — Planting Guide
Grant County is in USDA Zone 6b. The average last spring frost is April 11 and the first fall frost is October 27, giving you a growing season of approximately 199 days.
At an elevation of 564 ft, Grant County receives approximately 25.7 in of rainfall annually. Summer highs average 89°F with winter lows around 26°F. The predominant soil type is Loam.
Based on 30 years of NOAA climate station data, the last frost date here varies by 34 days year to year — ranging from March 19 in warm years to April 23 in cold years. The growing season is trending shorter by about 1.18 days per decade. Grant County scores 63/100 (Good) on the Microclimate Index.
🌡️ Zone
6b (-5°F to 0°F min)
❄️ Last Frost
April 11
🍂 First Frost
October 27
📅 Growing Season
199 days
⛰️ Elevation
564 ft
🌧️ Annual Rainfall
25.7 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 | 0.6 in | 3 days | — | None |
| Feb | 0.9 in | 4 days | — | None |
| Mar | 1.7 in | 5 days | 2.6 in | High |
| Apr | 2.9 in | 7 days | 1.4 in | Moderate |
| May | 3.6 in | 8 days | 0.7 in | Moderate |
| Jun | 4.3 in | 7 days | — | Low |
| Jul | 3.6 in | 9 days | 0.7 in | Moderate |
| Aug | 3.1 in | 6 days | 1.2 in | Moderate |
| Sep | 2 in | 5 days | 2.3 in | High |
| Oct | 1.5 in | 5 days | 2.8 in | High |
| Nov | 0.8 in | 3 days | — | None |
| Dec | 0.7 in | 4 days | — | None |
Annual total: 25.7 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.
Grant County Soil Profile
Soil Type
Loam
Soil pH
6.5-7.2
Drainage
Well Drained
Frost Risk Probability
Based on 30 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 23 | Nov 13 | 204 days |
| Cautious | Apr 16 | Nov 4 | 202 days |
| Average year | Apr 11 | Oct 27 | 199 days |
| Optimistic | Apr 3 | Oct 23 | 203 days |
| Aggressive (risky) | Mar 19 | Oct 15 | 210 days |
Not very — frost dates can vary by ±34 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 1.2 days per decade). Use the "Conservative" dates and choose fast-maturing varieties.
Gardening Difficulty Score
Grant County offers good growing conditions. A little planning around frost dates goes a long way.
Local Gardening Help in Grant 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 Grant County's climate and soil.
County Extension Office
Grant County Oklahoma State University Extension Extension Office
Phone: 405-744-5398
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 Grant County
Finding local nurseries & garden centers in Grant County
Why Buy Local
Local nurseries carry plants that are proven to grow in your area. Staff can give you advice specific to Grant 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 Grant County OK" or "garden center Grant 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 Grant County OK" or check your extension office and local parks department. Facebook groups like "Grant County Gardeners" or "Oklahoma 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
14.5 hours
Summer solstice daylight
Shortest Day
9.5 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 | 9.7 hr | 5.4 hr | Short day |
| February | 10.6 hr | 5.9 hr | Short day |
| March | 11.7 hr | 7.1 hr | Short day |
| April | 12.9 hr | 8 hr | Neutral |
| May | 14 hr | 8.9 hr | Long day |
| June | 14.5 hr | 9.7 hr | Long day |
| July | 14.3 hr | 10.7 hr | Long day |
| August | 13.4 hr | 9.1 hr | Neutral |
| September | 12.2 hr | 8.3 hr | Neutral |
| October | 11 hr | 6.8 hr | Short day |
| November | 10 hr | 6 hr | Short day |
| December | 9.5 hr | 5 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 Oct.
Best Month to Compost
Jun
Microbial activity peaks when soil is warm.
Active Composting
7 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 | 32°F | 38°F | ❄️ Dormant | ~36 weeks |
| Feb | 33°F | 38°F | ❄️ Dormant | ~36 weeks |
| Mar | 41°F | 42°F | 🐢 Slow | ~24 weeks |
| Apr | 54°F | 50°F | ♻️ Active | ~14 weeks |
| May | 64°F | 59°F | ♻️ Active | ~14 weeks |
| Jun | 75°F | 68°F | 🔥 Peak | ~8 weeks |
| Jul | 84°F | 77°F | 🔥 Peak | ~8 weeks |
| Aug | 84°F | 78°F | 🔥 Peak | ~8 weeks |
| Sep | 74°F | 74°F | 🔥 Peak | ~8 weeks |
| Oct | 63°F | 67°F | ♻️ Active | ~14 weeks |
| Nov | 50°F | 55°F | 🐢 Slow | ~24 weeks |
| Dec | 40°F | 46°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 Grant 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 | High | Apr, May, Jun, Jul, Aug, Sep |
| Japanese beetles | Moderate | Jun, Jul, Aug |
| Squash vine borers | Moderate | Jun, Jul |
| Tomato hornworms | Moderate | Jun, Jul, Aug |
| Cucumber beetles | Moderate | May, Jun, Jul |
| Stink bugs | Low | Jun, Jul, Aug, Sep |
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 Grant 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 28 | ✓ Yes | Fixes nitrogen, good for heavy clay soils |
| Crimson clover | Aug 19 | Mar 28 | ✓ Yes | Fixes nitrogen, attracts pollinators in spring |
| Daikon radish | Sep 8 | Mar 28 | — | Deep taproot breaks compaction, excellent for clay soils |
| Hairy vetch | Aug 1 | Mar 21 | ✓ Yes | Excellent nitrogen fixer, good for depleted soils |
| Oats | Sep 19 | Mar 21 | — | Quick biomass, winterkills in cold zones — no spring tillage needed |
| Winter rye | Jul 23 | Mar 21 | — | Suppresses weeds, prevents erosion, breaks up compacted soil |
| Winter wheat | Aug 1 | Mar 28 | — | Erosion control, weed suppression, good biomass |
Spring Cover Crops (3 options) — Build soil before the main growing season
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Buckwheat | Apr 13 | Aug 18 | — | Rapid growth, attracts pollinators, suppresses weeds |
| Sorghum-sudan grass | Apr 20 | Aug 18 | — | Massive biomass, breaks compaction, suppresses nematodes |
| White clover | Mar 12 | Aug 18 | ✓ 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 2 | Oct 6 | — | 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: 16 mph Summer: 11 mph
Fall: 13 mph Winter: 15 mph
Prevailing wind: S. Windy area — plant a windbreak hedge on the S side of your garden.
Windbreak Benefit
7.2/10
Strongly recommended — a windbreak (fence, hedge, or row of tall crops like corn or sunflowers) will significantly improve garden yields.
Frost Pocket Risk
Low
Relatively flat terrain (201 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
12,808 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 2,000 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, Nov, Dec
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 25.7 inches of rain per year
- A 1,000 sq ft roof can collect roughly 12,808 gallons annually
- Rainwater harvesting is fully legal in your state
- Stock up on stored water before your dry season (Jan, Feb, Nov)
- Use a first-flush diverter to keep roof debris out of your collection
Soil & Growing Conditions in Grant County
Soil Type
Loam
Soil pH 6.5–7.2 · Moderately Well Drained drainage
Native soil is well-suited to most vegetables and herbs with regular compost additions.
Watering Needs
Drought stress: 5.5/10
Moderate drought pressure. Drip irrigation and mulching are highly recommended to maintain soil moisture through summer.
Season Tips
199-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 Grant County
108 vegetables that grow well in Zone 6b with planting dates for Grant County.
Show all 108 vegetables with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Acorn Squash | Mar 7 | Apr 18 | Apr 25 | Jul 18 – Aug 22 | 80–100 |
| Amaranth | Feb 14 | Apr 18 | Apr 25 | Jul 25 – Sep 12 | 90–120 |
| Arugula | Mar 7 | Mar 28 | Apr 11 | May 16 – Jul 18 | 30–50 |
| Asparagus | — | — | Apr 25 | — | 730–1095 |
| Beets | — | Mar 28 | — | May 23 – Jun 20 | 50–70 |
| Belgian Endive | Mar 7 | Mar 28 | Apr 11 | Aug 1 – Sep 26 | 110–150 |
| Bitter Melon | Feb 14 | Apr 18 | Apr 25 | Jun 27 – Aug 8 | 60–90 |
| Black Beans | — | Apr 18 | — | Jul 18 – Sep 5 | 90–120 |
| Bok Choy | Mar 7 | Mar 28 | Apr 11 | May 23 – Jun 27 | 40–60 |
| Broccoli | Mar 7 | Mar 28 | Apr 11 | Jun 13 – Jul 25 | 60–90 |
| Broccoli Rabe | Mar 7 | Mar 28 | Apr 11 | May 23 – Jun 27 | 40–60 |
| Brussels Sprouts | Mar 7 | Mar 28 | Apr 11 | Jul 11 – Sep 5 | 90–130 |
| Butternut Squash | Mar 7 | Apr 18 | Apr 25 | Jul 25 – Aug 29 | 85–110 |
| Cabbage | Mar 7 | Mar 28 | Apr 11 | Jun 13 – Aug 8 | 60–100 |
| Calabash | Feb 14 | Apr 18 | Apr 25 | Jul 18 – Sep 12 | 80–120 |
| Carrots | — | Mar 28 | — | May 30 – Jul 4 | 60–80 |
| Cauliflower | Mar 7 | Mar 28 | Apr 11 | Jun 6 – Aug 8 | 55–100 |
| Celeriac | Mar 7 | Mar 28 | Apr 11 | Jul 25 – Aug 29 | 100–120 |
| Celery | Mar 7 | Mar 28 | Apr 11 | Jul 4 – Aug 29 | 80–120 |
| Celtuce | Mar 7 | Mar 28 | Apr 11 | Jun 13 – Jul 25 | 60–90 |
| Chard | Mar 7 | Mar 28 | Apr 11 | Jun 6 – Jul 25 | 50–60 |
| Chickpeas | Mar 7 | Mar 28 | Apr 11 | Jul 4 – Aug 15 | 80–110 |
| Chicory | Mar 7 | Mar 28 | Apr 11 | Jun 13 – Jul 25 | 60–85 |
| Chinese Cabbage | Mar 7 | Mar 28 | Apr 11 | Jun 6 – Jul 4 | 50–70 |
| Christmas Lima Beans | Feb 14 | Apr 18 | Apr 25 | Jul 18 – Aug 22 | 80–100 |
| Collard Greens | Mar 7 | Mar 28 | Apr 11 | Jun 6 – Aug 8 | 55–75 |
| Corn | — | Apr 18 | — | Jun 20 – Aug 15 | 60–100 |
| Cowpeas | — | Apr 18 | — | Jun 20 – Aug 1 | 60–90 |
| Cress | Mar 7 | Mar 28 | Apr 11 | Apr 25 – May 16 | 14–21 |
| Crookneck Squash | Mar 7 | Apr 18 | Apr 25 | Jun 13 – Jul 11 | 45–60 |
| Crosne | — | Mar 28 | — | Aug 29 – Oct 10 | 150–200 |
| Cucumber | Mar 7 | Apr 18 | Apr 25 | Jun 20 – Aug 15 | 50–70 |
| Daikon | — | Mar 28 | — | May 23 – Jun 20 | 50–70 |
| Delicata Squash | Mar 7 | Apr 18 | Apr 25 | Jul 18 – Aug 22 | 80–100 |
| Edamame | — | Apr 18 | — | Jul 4 – Aug 15 | 75–100 |
| Eggplant | Jan 31 | Apr 18 | Apr 25 | Jul 4 – Sep 5 | 65–85 |
| Endive | Mar 7 | Mar 28 | Apr 11 | May 30 – Jul 4 | 45–65 |
| Escarole | Mar 7 | Mar 28 | Apr 11 | Jun 6 – Jul 4 | 50–70 |
| Fava Beans | Mar 7 | Mar 28 | Apr 11 | Jun 27 – Aug 8 | 75–100 |
| Fennel | Feb 14 | Apr 18 | Apr 25 | Jun 27 – Aug 8 | 60–90 |
| Garlic | — | — | — | — | 90–240 |
| Green Beans | — | Apr 18 | — | Jun 13 – Aug 8 | 50–65 |
| Horseradish | — | — | Apr 25 | Aug 29 – Nov 7 | 120–180 |
| Hot Peppers | Jan 31 | Apr 18 | Apr 25 | Jul 4 – Oct 10 | 70–120 |
| Hubbard Squash | Mar 7 | Apr 18 | Apr 25 | Aug 8 – Sep 12 | 100–120 |
| Kabocha | Mar 7 | Apr 18 | Apr 25 | Jul 25 – Aug 22 | 85–100 |
| Kai Lan | Mar 7 | Mar 28 | Apr 11 | May 30 – Jun 27 | 45–60 |
| Kale | Mar 7 | Mar 28 | Apr 11 | Jun 6 – Aug 1 | 50–70 |
| Kidney Beans | — | Apr 18 | — | Jul 18 – Aug 22 | 85–110 |
| Kohlrabi | Mar 7 | Mar 28 | Apr 11 | May 30 – Jul 4 | 45–65 |
| Komatsuna | Mar 7 | Mar 28 | Apr 11 | May 16 – Jun 20 | 35–50 |
| Leeks | Mar 7 | Mar 28 | Apr 11 | Jul 11 – Sep 26 | 90–150 |
| Lentils | Mar 7 | Mar 28 | Apr 11 | Jul 4 – Aug 15 | 80–110 |
| Lettuce | Mar 7 | Mar 28 | Apr 11 | May 16 – Jul 25 | 30–60 |
| Lima Beans | — | Apr 18 | — | Jun 20 – Aug 1 | 60–90 |
| Loofah | Feb 14 | Apr 18 | Apr 25 | Aug 8 – Oct 10 | 100–150 |
| Luffa | Feb 14 | Apr 18 | Apr 25 | Jul 25 – Oct 10 | 90–150 |
| Mache | Mar 7 | Mar 28 | Apr 11 | May 23 – Jun 27 | 40–60 |
| Melon | Mar 7 | Apr 18 | Apr 25 | Jul 4 – Aug 22 | 70–100 |
| Microgreens | Mar 7 | Mar 28 | Apr 11 | Apr 18 – May 16 | 7–21 |
| Mitsuba | Mar 7 | Mar 28 | Apr 4 | May 30 – Jul 25 | 50–70 |
| Mizuna | Mar 7 | Mar 28 | Apr 11 | May 16 – Jun 13 | 30–45 |
| Mustard Greens | Mar 7 | Mar 28 | Apr 11 | May 16 – Jul 18 | 30–50 |
| Napa Cabbage | Mar 7 | Mar 28 | Apr 11 | Jun 6 – Jul 11 | 55–75 |
| New Zealand Spinach | Feb 14 | Apr 18 | Apr 25 | Jun 20 – Jul 18 | 55–70 |
| Okra | Feb 14 | Apr 18 | Apr 25 | Jun 20 – Aug 15 | 50–65 |
| Onion | Mar 7 | Mar 28 | Apr 11 | Jul 11 – Aug 29 | 90–120 |
| Pac Choi | Mar 7 | Mar 28 | Apr 11 | May 23 – Jun 20 | 40–55 |
| Parsnip | — | Mar 28 | — | Jul 11 – Aug 22 | 100–130 |
| Patty Pan Squash | Mar 7 | Apr 18 | Apr 25 | Jun 13 – Jul 11 | 45–60 |
| Peas | Mar 7 | Mar 28 | Apr 11 | Jun 6 – Aug 1 | 55–70 |
| Peppers | Jan 31 | Apr 18 | Apr 25 | Jun 27 – Sep 5 | 60–90 |
| Pole Beans | Feb 14 | Apr 18 | Apr 25 | Jun 20 – Aug 15 | 55–70 |
| Potatoes | Feb 14 | Apr 18 | Apr 25 | Jul 4 – Sep 12 | 70–120 |
| Pumpkin | Mar 7 | Apr 18 | Apr 25 | Jul 25 – Sep 12 | 85–120 |
| Purslane | Mar 7 | Mar 28 | Apr 11 | May 23 – Jun 27 | 40–60 |
| Radicchio | Mar 7 | Mar 28 | Apr 11 | Jun 13 – Jul 18 | 60–80 |
| Radish | — | Mar 28 | — | Apr 25 – May 16 | 22–35 |
| Rhubarb | — | — | May 2 | — | 365–730 |
| Romanesco | Mar 7 | Mar 28 | Apr 11 | Jun 27 – Aug 8 | 75–100 |
| Rutabaga | — | Mar 28 | — | Jun 20 – Jul 25 | 80–100 |
| Salsify | — | Mar 28 | — | Jul 11 – Aug 22 | 100–130 |
| Savoy Cabbage | Mar 7 | Mar 28 | Apr 11 | Jun 20 – Aug 15 | 70–110 |
| Scallions | Mar 7 | Mar 28 | Apr 11 | Jun 6 – Jul 4 | 50–70 |
| Scarlet Runner Beans | Feb 14 | Apr 18 | Apr 25 | Jun 27 – Aug 1 | 60–80 |
| Shallot | Mar 7 | Mar 28 | Apr 11 | Jul 11 – Aug 29 | 90–120 |
| Shiso | Feb 21 | Apr 18 | Apr 25 | Jun 20 – Aug 15 | 50–70 |
| Snap Peas | Feb 14 | Apr 18 | Apr 25 | Jun 20 – Aug 15 | 55–70 |
| Snow Peas | Mar 7 | Mar 28 | Apr 11 | Jun 6 – Aug 1 | 50–65 |
| Soybeans | — | Apr 18 | — | Jul 11 – Sep 5 | 80–120 |
| Spaghetti Squash | Mar 7 | Apr 18 | Apr 25 | Jul 25 – Aug 22 | 85–100 |
| Spinach | Mar 7 | Mar 28 | Apr 11 | May 16 – Jul 18 | 35–50 |
| Squash (Summer) | Mar 7 | Apr 18 | Apr 25 | Jun 13 – Aug 15 | 45–65 |
| Squash (Winter) | Mar 7 | Apr 18 | Apr 25 | Jul 18 – Sep 12 | 80–120 |
| Sunchoke | — | — | Apr 25 | Aug 15 – Oct 10 | 110–150 |
| Sunflower | Feb 14 | Apr 18 | Apr 25 | Jul 4 – Aug 22 | 70–100 |
| Sweet Corn | — | Apr 18 | — | Jun 20 – Aug 1 | 60–90 |
| Sweet Potatoes | Feb 14 | Apr 18 | Apr 25 | Jul 25 – Sep 12 | 90–120 |
| Tatsoi | Mar 7 | Mar 28 | Apr 11 | May 16 – Jun 20 | 35–50 |
| Tomatillo | Feb 14 | Apr 18 | Apr 25 | Jun 27 – Sep 5 | 60–85 |
| Tomatoes | Feb 14 | Apr 18 | Apr 25 | Jun 27 – Sep 5 | 60–85 |
| Turnip | — | Mar 28 | — | May 9 – Jun 13 | 40–60 |
| Watercress | Mar 7 | Mar 28 | Apr 11 | May 23 – Jun 27 | 40–60 |
| Watermelon | Mar 7 | Apr 18 | Apr 25 | Jul 4 – Aug 22 | 70–100 |
| Wax Beans | — | Apr 18 | — | Jun 13 – Aug 8 | 50–65 |
| Winter Melon | Feb 14 | Apr 18 | Apr 25 | Jul 25 – Sep 12 | 90–120 |
| Yard Long Beans | Feb 14 | Apr 18 | Apr 25 | Jun 20 – Aug 1 | 55–80 |
| Zucchini | Mar 7 | Apr 18 | Apr 25 | Jun 13 – Aug 8 | 45–60 |
🍓 Fruits to Grow in Grant County
27 fruits that grow well in Zone 6b with planting dates for Grant County.
Show all 27 fruits with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Alpine Strawberries | — | — | May 2 | Aug 1 – Nov 14 | 90–180 |
| Aronia | — | — | May 2 | — | 730–1095 |
| Blackberries | — | — | May 2 | — | 365–730 |
| Blueberries | — | — | May 2 | — | 730–1095 |
| Boysenberries | — | — | May 2 | — | 365–730 |
| Cantaloupe | — | — | May 2 | Jul 11 – Aug 15 | 70–90 |
| Che Fruit | — | — | May 2 | — | 1095–1825 |
| Cranberries | — | — | May 2 | — | 730–1095 |
| Currants | — | — | May 2 | — | 730–1095 |
| Elderberries | — | — | May 2 | — | 730–1095 |
| Goji Berries | — | — | May 2 | — | 730–1095 |
| Gooseberries | — | — | May 2 | — | 730–1095 |
| Grapes | — | — | May 2 | — | 730–1095 |
| Ground Cherry | — | — | May 2 | Jul 11 – Sep 5 | 65–80 |
| Hardy Kiwi | — | — | May 2 | — | 1095–1825 |
| Haskaps | — | — | May 2 | — | 730–1095 |
| Honeydew | — | — | May 2 | Jul 25 – Sep 5 | 80–110 |
| Jostaberry | — | — | May 2 | — | 730–1095 |
| Lingonberries | — | — | May 2 | — | 730–1095 |
| Medlar | — | — | May 2 | — | 1095–1825 |
| Mulberries | — | — | May 2 | — | 730–1825 |
| Pawpaw | — | — | May 2 | — | 1095–2555 |
| Persimmon | — | — | May 2 | — | 1095–2555 |
| Quince | — | — | May 2 | — | 1095–1825 |
| Raspberries | — | — | May 2 | — | 365–730 |
| Serviceberries | — | — | May 2 | — | 730–1095 |
| Strawberries | — | — | May 2 | Aug 1 – Nov 14 | 90–365 |
🌿 Herbs to Grow in Grant County
38 herbs that grow well in Zone 6b with planting dates for Grant County.
Show all 38 herbs with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Angelica | Mar 7 | Mar 28 | Apr 4 | — | 365–730 |
| Anise | Mar 7 | Mar 28 | Apr 4 | Jul 4 – Sep 19 | 90–120 |
| Basil | Feb 21 | Apr 18 | Apr 25 | Jun 20 – Aug 22 | 50–75 |
| Bee Balm | — | — | Apr 18 | Jul 18 – Oct 3 | 90–120 |
| Borage | Mar 7 | Mar 28 | Apr 4 | May 30 – Jul 18 | 50–60 |
| Caraway | Mar 7 | Mar 28 | Apr 4 | — | 365–450 |
| Catnip | — | — | Apr 18 | Jun 20 – Aug 22 | 60–80 |
| Chamomile | Mar 7 | Mar 28 | Apr 4 | Jun 6 – Aug 15 | 60–90 |
| Chervil | Mar 7 | Mar 28 | Apr 4 | May 16 – Jul 18 | 40–60 |
| Chives | — | — | Apr 18 | Jun 20 – Aug 29 | 60–90 |
| Cilantro | Mar 7 | Mar 28 | Apr 4 | May 16 – Jul 18 | 40–60 |
| Comfrey | — | — | Apr 18 | Jun 20 – Aug 29 | 60–90 |
| Cumin | Mar 7 | Mar 28 | Apr 4 | Jul 18 – Sep 19 | 100–120 |
| Dill | Mar 7 | Mar 28 | Apr 4 | May 16 – Jul 18 | 40–60 |
| Echinacea | — | — | Apr 18 | Aug 22 – Oct 31 | 120–180 |
| Epazote | Feb 21 | Apr 18 | Apr 25 | Jun 13 – Aug 8 | 45–60 |
| Fennel (herb) | Mar 7 | Mar 28 | Apr 4 | Jun 6 – Aug 15 | 60–90 |
| Feverfew | — | — | Apr 18 | Jul 18 – Oct 3 | 90–120 |
| Garlic Chives | — | — | Apr 18 | Jun 20 – Aug 29 | 60–90 |
| Horehound | — | — | Apr 18 | Jul 4 – Aug 29 | 75–90 |
| Hyssop | — | — | Apr 18 | Jun 27 – Aug 29 | 70–90 |
| Lavender | — | — | Apr 18 | Jul 18 – Oct 31 | 90–200 |
| Lemon Balm | — | — | Apr 18 | Jun 20 – Aug 8 | 60–70 |
| Lemon Thyme | — | — | Apr 18 | Jun 27 – Aug 29 | 70–90 |
| Lovage | — | — | Apr 18 | Jun 27 – Aug 29 | 70–90 |
| Marjoram | — | — | Apr 18 | Jun 20 – Aug 29 | 60–90 |
| Mint | — | — | Apr 18 | Jun 20 – Aug 29 | 60–90 |
| Oregano | — | — | Apr 18 | Jun 20 – Aug 29 | 60–90 |
| Parsley | Mar 7 | Mar 28 | Apr 4 | Jun 6 – Aug 8 | 60–80 |
| Rue | — | — | Apr 18 | Jun 27 – Aug 29 | 70–90 |
| Sage | — | — | Apr 18 | Jul 4 – Aug 29 | 75–90 |
| Savory | — | — | Apr 18 | Jun 13 – Aug 8 | 50–70 |
| Sorrel | Mar 7 | Mar 28 | Apr 4 | May 16 – Jul 18 | 40–60 |
| Tarragon | — | — | Apr 18 | Jun 20 – Aug 29 | 60–90 |
| Thai Basil | Feb 21 | Apr 18 | Apr 25 | Jun 20 – Aug 22 | 50–75 |
| Thyme | — | — | Apr 18 | Jun 27 – Aug 29 | 70–90 |
| Valerian | — | — | Apr 18 | Aug 22 – Oct 31 | 120–180 |
| Yarrow | — | — | Apr 18 | Jul 18 – Oct 3 | 90–120 |
Monthly Planting Guide for Grant County
Gardening Guides & Resources
Helpful guides from The Ultimate Homestead to improve your garden in Grant County.
Frequently Asked Questions
What planting zone is Grant County, OK?
Grant County is in USDA Hardiness Zone 6b. 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 Grant County, OK?
Based on 30 years of NOAA weather station data, the median last spring frost in Grant County falls around April 11. In 8 out of 10 years, last frost lands between March 19 and April 23 — a 34-day window of variability. Use April 23 as your conservative safe-to-plant date for frost-sensitive crops.
When is the first fall frost in Grant County, OK?
The median first fall frost in Grant County arrives around October 27. In cold years it can arrive as early as October 15; in mild years as late as November 13. Harvest or protect frost-sensitive crops — tomatoes, peppers, basil, squash — before this date.
How long is the growing season in Grant County?
Grant County has a frost-free growing season of approximately 199 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 shorter by about 1.18 days per decade.
What is the soil like in Grant County for gardening?
Grant County has predominantly Loam soil with a pH range of 6.5–7.2 and Moderately Well Drained drainage. Most vegetables and herbs grow well with standard composting and seasonal soil amendment.
What is grown commercially in Grant County?
Grant County has commercial agriculture that includes Wheat, Hay, Cattle. These crops reflect the local climate and soil conditions — what succeeds commercially often translates well to home gardens in the same area.
Is Grant County a good location for home gardening?
Grant County scores 63/100 (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 Grant County gardeners in Zone 6b 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.
