Johnson County, AR — Planting Guide
Johnson County is in USDA Zone 7a. The average last spring frost is March 26 and the first fall frost is November 3, giving you a growing season of approximately 222 days.
At an elevation of 1,347 ft, Johnson County receives approximately 49.7 in of rainfall annually. Summer highs average 91°F with winter lows around 31°F. The predominant soil type is Silt Loam.
Based on 31 years of NOAA climate station data, the last frost date here varies by 32 days year to year — ranging from March 8 in warm years to April 9 in cold years. The growing season is trending longer by about 1.72 days per decade. Johnson County scores 63/100 (Good) on the Microclimate Index.
🌡️ Zone
7a (0°F to 5°F min)
❄️ Last Frost
March 26
🍂 First Frost
November 3
📅 Growing Season
222 days
⛰️ Elevation
1,347 ft
🌧️ Annual Rainfall
49.7 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 | 3.8 in | 11 days | — | None |
| Feb | 3.8 in | 8 days | — | None |
| Mar | 4.7 in | 11 days | — | Low |
| Apr | 3.6 in | 7 days | 0.7 in | Moderate |
| May | 4.1 in | 9 days | 0.2 in | Low |
| Jun | 5 in | 11 days | — | Low |
| Jul | 4.6 in | 13 days | — | Low |
| Aug | 4.3 in | 11 days | — | Low |
| Sep | 4.1 in | 7 days | 0.2 in | Low |
| Oct | 3.7 in | 6 days | 0.6 in | Moderate |
| Nov | 4.2 in | 8 days | — | None |
| Dec | 3.9 in | 9 days | — | None |
Annual total: 49.8 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.
Johnson County Soil Profile
Soil Type
Silt Loam
Soil pH
5.3-7
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 9 | Nov 24 | 229 days |
| Cautious | Apr 5 | Nov 12 | 221 days |
| Average year | Mar 26 | Nov 3 | 222 days |
| Optimistic | Mar 21 | Oct 28 | 221 days |
| Aggressive (risky) | Mar 8 | Oct 18 | 224 days |
Not very — frost dates can vary by ±32 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
Johnson County offers good growing conditions. A little planning around frost dates goes a long way.
Local Gardening Help in Johnson 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 Johnson County's climate and soil.
County Extension Office
Johnson County University of Arkansas Division of Agriculture Extension Extension Office
Phone: 501-671-2000
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 Johnson County
Finding local nurseries & garden centers in Johnson County
Why Buy Local
Local nurseries carry plants that are proven to grow in your area. Staff can give you advice specific to Johnson 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 Johnson County AR" or "garden center Johnson 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 Johnson County AR" or check your extension office and local parks department. Facebook groups like "Johnson County Gardeners" or "Arkansas 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
14.4 hours
Summer solstice daylight
Shortest Day
9.6 hours
Winter solstice daylight
Peak Sun Hours
8.7 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: Day-neutral onion varieties like Candy, Cabernet, and Sierra Blanca perform best in your day-length range.
View detailed monthly data
| Month | Daylight Hours | Peak Sun Hours | Day Length |
|---|---|---|---|
| January | 9.8 hr | 4.7 hr | Short day |
| February | 10.7 hr | 5.8 hr | Short day |
| March | 11.7 hr | 6.3 hr | Short day |
| April | 12.9 hr | 7.5 hr | Neutral |
| May | 13.9 hr | 8.5 hr | Neutral |
| June | 14.4 hr | 8.7 hr | Long day |
| July | 14.2 hr | 7.6 hr | Long day |
| August | 13.3 hr | 7.1 hr | Neutral |
| September | 12.2 hr | 7.1 hr | Neutral |
| October | 11.1 hr | 6.9 hr | Short day |
| November | 10.1 hr | 5.7 hr | Short day |
| December | 9.6 hr | 4.6 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
May
Microbial activity peaks when soil is warm.
Active Composting
8 months
Nearly year-round composting.
View detailed monthly data
| Month | Soil 4" Deep | Soil 8" Deep | Compost Activity | Time to Finish |
|---|---|---|---|---|
| Jan | 36°F | 46°F | ❄️ Dormant | ~36 weeks |
| Feb | 37°F | 43°F | ❄️ Dormant | ~36 weeks |
| Mar | 44°F | 49°F | 🐢 Slow | ~24 weeks |
| Apr | 55°F | 55°F | ♻️ Active | ~14 weeks |
| May | 67°F | 65°F | 🔥 Peak | ~8 weeks |
| Jun | 78°F | 73°F | 🔥 Peak | ~8 weeks |
| Jul | 83°F | 80°F | 🔥 Peak | ~8 weeks |
| Aug | 84°F | 82°F | 🔥 Peak | ~8 weeks |
| Sep | 80°F | 78°F | 🔥 Peak | ~8 weeks |
| Oct | 70°F | 69°F | 🔥 Peak | ~8 weeks |
| Nov | 56°F | 61°F | ♻️ Active | ~14 weeks |
| Dec | 42°F | 51°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 Johnson 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 | Moderate | Mar, Apr, May, Jun, Jul, Aug, Sep, Oct |
| Japanese beetles | Moderate | Jun, Jul, Aug |
| Squash vine borers | Moderate | May, Jun, Jul |
| Stink bugs | High | May, Jun, Jul, Aug, Sep |
| Whiteflies | Low | Jun, Jul, Aug, Sep |
| Spider mites | Moderate | Jul, Aug |
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 Johnson 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 | Aug 25 | Mar 5 | ✓ Yes | Fixes nitrogen, good for heavy clay soils |
| Crimson clover | Aug 22 | Mar 12 | ✓ Yes | Fixes nitrogen, attracts pollinators in spring |
| Daikon radish | Sep 16 | Mar 12 | — | Deep taproot breaks compaction, excellent for clay soils |
| Hairy vetch | Aug 14 | Mar 12 | ✓ Yes | Excellent nitrogen fixer, good for depleted soils |
| Oats | Oct 2 | Mar 12 | — | Quick biomass, winterkills in cold zones — no spring tillage needed |
| Winter rye | Aug 14 | Mar 5 | — | Suppresses weeds, prevents erosion, breaks up compacted soil |
| Winter wheat | Aug 3 | Mar 5 | — | 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 4 | Aug 25 | — | Rapid growth, attracts pollinators, suppresses weeds |
| Cowpeas (southern peas) | Mar 28 | Sep 8 | ✓ Yes | Excellent nitrogen fixer for warm climates, edible |
| Sorghum-sudan grass | Apr 7 | Sep 1 | — | Massive biomass, breaks compaction, suppresses nematodes |
| White clover | Feb 26 | Sep 1 | ✓ 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 26 | Oct 13 | — | 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: 8 mph Summer: 8 mph
Fall: 7 mph Winter: 8 mph
Prevailing wind: SW. Low wind — no windbreak needed for most crops.
Windbreak Benefit
2.8/10
Low need — wind is not a major factor in your garden planning.
Frost Pocket Risk
Moderate
Some terrain variation (579 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
24,820 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 250 gal tank.
Legal Status
Unrestricted
Rainwater harvesting is fully legal in your state with no restrictions.
Best Collection Months
Mar, Jun, Jul, Aug
Highest rainfall months — your barrels will fill up quickly during these months.
Months to Draw From Storage
Feb, Apr, Oct
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 49.8 inches of rain per year
- A 1,000 sq ft roof can collect roughly 24,820 gallons annually
- Rainwater harvesting is fully legal in your state
- Stock up on stored water before your dry season (Feb, Apr, Oct)
- Use a first-flush diverter to keep roof debris out of your collection
Soil & Growing Conditions in Johnson County
Soil Type
Silt Loam
Soil pH 5.3–7 · Moderately Well Drained drainage
Good candidate for raised beds to maximise drainage and extend the season.
Watering Needs
Drought stress: 1.5/10
Johnson County has very low drought pressure. Natural rainfall usually meets garden needs — water only during extended dry spells.
Season Tips
222-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 Johnson County
113 vegetables that grow well in Zone 7a with planting dates for Johnson County.
Show all 113 vegetables with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Acorn Squash | Feb 26 | Apr 2 | Apr 9 | Jul 2 – Aug 6 | 80–100 |
| Amaranth | Feb 5 | Apr 2 | Apr 9 | Jul 9 – Aug 27 | 90–120 |
| Artichoke | — | — | Apr 9 | Aug 13 – Oct 22 | 120–180 |
| Arugula | Feb 19 | Mar 12 | Mar 26 | Apr 30 – Jul 2 | 30–50 |
| Asparagus | — | — | Apr 9 | — | 730–1095 |
| Beets | — | Mar 12 | — | May 7 – Jun 4 | 50–70 |
| Belgian Endive | Feb 19 | Mar 12 | Mar 26 | Jul 16 – Sep 10 | 110–150 |
| Bitter Melon | Feb 5 | Apr 2 | Apr 9 | Jun 11 – Jul 23 | 60–90 |
| Black Beans | — | Apr 2 | — | Jul 2 – Aug 20 | 90–120 |
| Bok Choy | Feb 19 | Mar 12 | Mar 26 | May 7 – Jun 11 | 40–60 |
| Broccoli | Feb 19 | Mar 12 | Mar 26 | May 28 – Jul 9 | 60–90 |
| Broccoli Rabe | Feb 19 | Mar 12 | Mar 26 | May 7 – Jun 11 | 40–60 |
| Brussels Sprouts | Feb 19 | Mar 12 | Mar 26 | Jun 25 – Aug 20 | 90–130 |
| Butternut Squash | Feb 26 | Apr 2 | Apr 9 | Jul 9 – Aug 13 | 85–110 |
| Cabbage | Feb 19 | Mar 12 | Mar 26 | May 28 – Jul 23 | 60–100 |
| Calabash | Feb 5 | Apr 2 | Apr 9 | Jul 2 – Aug 27 | 80–120 |
| Cardoon | — | — | Apr 9 | Aug 13 – Sep 24 | 120–150 |
| Carrots | — | Mar 12 | — | May 14 – Jun 18 | 60–80 |
| Cauliflower | Feb 19 | Mar 12 | Mar 26 | May 21 – Jul 23 | 55–100 |
| Celeriac | Feb 19 | Mar 12 | Mar 26 | Jul 9 – Aug 13 | 100–120 |
| Celery | Feb 19 | Mar 12 | Mar 26 | Jun 18 – Aug 13 | 80–120 |
| Celtuce | Feb 19 | Mar 12 | Mar 26 | May 28 – Jul 9 | 60–90 |
| Chard | Feb 19 | Mar 12 | Mar 26 | May 21 – Jul 9 | 50–60 |
| Chayote | Feb 5 | Apr 2 | Apr 9 | Aug 13 – Oct 22 | 120–180 |
| Chickpeas | Feb 19 | Mar 12 | Mar 26 | Jun 18 – Jul 30 | 80–110 |
| Chicory | Feb 19 | Mar 12 | Mar 26 | May 28 – Jul 9 | 60–85 |
| Chinese Cabbage | Feb 19 | Mar 12 | Mar 26 | May 21 – Jun 18 | 50–70 |
| Christmas Lima Beans | Feb 5 | Apr 2 | Apr 9 | Jul 2 – Aug 6 | 80–100 |
| Collard Greens | Feb 19 | Mar 12 | Mar 26 | May 21 – Jul 23 | 55–75 |
| Corn | — | Apr 2 | — | Jun 4 – Jul 30 | 60–100 |
| Cowpeas | — | Apr 2 | — | Jun 4 – Jul 16 | 60–90 |
| Cress | Feb 19 | Mar 12 | Mar 26 | Apr 9 – Apr 30 | 14–21 |
| Crookneck Squash | Feb 26 | Apr 2 | Apr 9 | May 28 – Jun 25 | 45–60 |
| Crosne | — | Mar 12 | — | Aug 13 – Oct 15 | 150–200 |
| Cucumber | Feb 26 | Apr 2 | Apr 9 | Jun 4 – Jul 30 | 50–70 |
| Daikon | — | Mar 12 | — | May 7 – Jun 4 | 50–70 |
| Delicata Squash | Feb 26 | Apr 2 | Apr 9 | Jul 2 – Aug 6 | 80–100 |
| Edamame | — | Apr 2 | — | Jun 18 – Jul 30 | 75–100 |
| Eggplant | Jan 22 | Apr 2 | Apr 9 | Jun 18 – Aug 20 | 65–85 |
| Endive | Feb 19 | Mar 12 | Mar 26 | May 14 – Jun 18 | 45–65 |
| Escarole | Feb 19 | Mar 12 | Mar 26 | May 21 – Jun 18 | 50–70 |
| Fava Beans | Feb 19 | Mar 12 | Mar 26 | Jun 11 – Jul 23 | 75–100 |
| Fennel | Feb 5 | Apr 2 | Apr 9 | Jun 11 – Jul 23 | 60–90 |
| Garlic | — | — | — | — | 90–240 |
| Green Beans | — | Apr 2 | — | May 28 – Jul 23 | 50–65 |
| Horseradish | — | — | Apr 9 | Aug 13 – Oct 22 | 120–180 |
| Hot Peppers | Jan 22 | Apr 2 | Apr 9 | Jun 18 – Sep 24 | 70–120 |
| Hubbard Squash | Feb 26 | Apr 2 | Apr 9 | Jul 23 – Aug 27 | 100–120 |
| Jicama | Feb 5 | Apr 2 | Apr 9 | Aug 13 – Oct 22 | 120–180 |
| Kabocha | Feb 26 | Apr 2 | Apr 9 | Jul 9 – Aug 6 | 85–100 |
| Kai Lan | Feb 19 | Mar 12 | Mar 26 | May 14 – Jun 11 | 45–60 |
| Kale | Feb 19 | Mar 12 | Mar 26 | May 21 – Jul 16 | 50–70 |
| Kidney Beans | — | Apr 2 | — | Jul 2 – Aug 6 | 85–110 |
| Kohlrabi | Feb 19 | Mar 12 | Mar 26 | May 14 – Jun 18 | 45–65 |
| Komatsuna | Feb 19 | Mar 12 | Mar 26 | Apr 30 – Jun 4 | 35–50 |
| Leeks | Feb 19 | Mar 12 | Mar 26 | Jun 25 – Sep 10 | 90–150 |
| Lentils | Feb 19 | Mar 12 | Mar 26 | Jun 18 – Jul 30 | 80–110 |
| Lettuce | Feb 19 | Mar 12 | Mar 26 | Apr 30 – Jul 9 | 30–60 |
| Lima Beans | — | Apr 2 | — | Jun 4 – Jul 16 | 60–90 |
| Loofah | Feb 5 | Apr 2 | Apr 9 | Jul 23 – Sep 24 | 100–150 |
| Luffa | Feb 5 | Apr 2 | Apr 9 | Jul 9 – Sep 24 | 90–150 |
| Mache | Feb 19 | Mar 12 | Mar 26 | May 7 – Jun 11 | 40–60 |
| Malabar Spinach | Feb 5 | Apr 2 | Apr 9 | Jun 4 – Jul 2 | 55–70 |
| Melon | Feb 26 | Apr 2 | Apr 9 | Jun 18 – Aug 6 | 70–100 |
| Microgreens | Feb 19 | Mar 12 | Mar 26 | Apr 2 – Apr 30 | 7–21 |
| Mitsuba | Feb 19 | Mar 12 | Mar 19 | May 14 – Jul 9 | 50–70 |
| Mizuna | Feb 19 | Mar 12 | Mar 26 | Apr 30 – May 28 | 30–45 |
| Mustard Greens | Feb 19 | Mar 12 | Mar 26 | Apr 30 – Jul 2 | 30–50 |
| Napa Cabbage | Feb 19 | Mar 12 | Mar 26 | May 21 – Jun 25 | 55–75 |
| New Zealand Spinach | Feb 5 | Apr 2 | Apr 9 | Jun 4 – Jul 2 | 55–70 |
| Okra | Feb 5 | Apr 2 | Apr 9 | Jun 4 – Jul 30 | 50–65 |
| Onion | Feb 19 | Mar 12 | Mar 26 | Jun 25 – Aug 13 | 90–120 |
| Pac Choi | Feb 19 | Mar 12 | Mar 26 | May 7 – Jun 4 | 40–55 |
| Parsnip | — | Mar 12 | — | Jun 25 – Aug 6 | 100–130 |
| Patty Pan Squash | Feb 26 | Apr 2 | Apr 9 | May 28 – Jun 25 | 45–60 |
| Peas | Feb 19 | Mar 12 | Mar 26 | May 21 – Jul 16 | 55–70 |
| Peppers | Jan 22 | Apr 2 | Apr 9 | Jun 11 – Aug 20 | 60–90 |
| Pole Beans | Feb 5 | Apr 2 | Apr 9 | Jun 4 – Jul 30 | 55–70 |
| Potatoes | Feb 5 | Apr 2 | Apr 9 | Jun 18 – Aug 27 | 70–120 |
| Pumpkin | Feb 26 | Apr 2 | Apr 9 | Jul 9 – Aug 27 | 85–120 |
| Purslane | Feb 19 | Mar 12 | Mar 26 | May 7 – Jun 11 | 40–60 |
| Radicchio | Feb 19 | Mar 12 | Mar 26 | May 28 – Jul 2 | 60–80 |
| Radish | — | Mar 12 | — | Apr 9 – Apr 30 | 22–35 |
| Rhubarb | — | — | Apr 16 | — | 365–730 |
| Romanesco | Feb 19 | Mar 12 | Mar 26 | Jun 11 – Jul 23 | 75–100 |
| Rutabaga | — | Mar 12 | — | Jun 4 – Jul 9 | 80–100 |
| Salsify | — | Mar 12 | — | Jun 25 – Aug 6 | 100–130 |
| Savoy Cabbage | Feb 19 | Mar 12 | Mar 26 | Jun 4 – Jul 30 | 70–110 |
| Scallions | Feb 19 | Mar 12 | Mar 26 | May 21 – Jun 18 | 50–70 |
| Scarlet Runner Beans | Feb 5 | Apr 2 | Apr 9 | Jun 11 – Jul 16 | 60–80 |
| Shallot | Feb 19 | Mar 12 | Mar 26 | Jun 25 – Aug 13 | 90–120 |
| Shiso | Feb 5 | Apr 2 | Apr 9 | Jun 4 – Jul 30 | 50–70 |
| Snap Peas | Feb 5 | Apr 2 | Apr 9 | Jun 4 – Jul 30 | 55–70 |
| Snow Peas | Feb 19 | Mar 12 | Mar 26 | May 21 – Jul 16 | 50–65 |
| Soybeans | — | Apr 2 | — | Jun 25 – Aug 20 | 80–120 |
| Spaghetti Squash | Feb 26 | Apr 2 | Apr 9 | Jul 9 – Aug 6 | 85–100 |
| Spinach | Feb 19 | Mar 12 | Mar 26 | Apr 30 – Jul 2 | 35–50 |
| Squash (Summer) | Feb 26 | Apr 2 | Apr 9 | May 28 – Jul 30 | 45–65 |
| Squash (Winter) | Feb 26 | Apr 2 | Apr 9 | Jul 2 – Aug 27 | 80–120 |
| Sunchoke | — | — | Apr 9 | Jul 30 – Sep 24 | 110–150 |
| Sunflower | Feb 5 | Apr 2 | Apr 9 | Jun 18 – Aug 6 | 70–100 |
| Sweet Corn | — | Apr 2 | — | Jun 4 – Jul 16 | 60–90 |
| Sweet Potatoes | Feb 5 | Apr 2 | Apr 9 | Jul 9 – Aug 27 | 90–120 |
| Tatsoi | Feb 19 | Mar 12 | Mar 26 | Apr 30 – Jun 4 | 35–50 |
| Tomatillo | Feb 5 | Apr 2 | Apr 9 | Jun 11 – Aug 20 | 60–85 |
| Tomatoes | Feb 5 | Apr 2 | Apr 9 | Jun 11 – Aug 20 | 60–85 |
| Turnip | — | Mar 12 | — | Apr 23 – May 28 | 40–60 |
| Watercress | Feb 19 | Mar 12 | Mar 26 | May 7 – Jun 11 | 40–60 |
| Watermelon | Feb 26 | Apr 2 | Apr 9 | Jun 18 – Aug 6 | 70–100 |
| Wax Beans | — | Apr 2 | — | May 28 – Jul 23 | 50–65 |
| Winter Melon | Feb 5 | Apr 2 | Apr 9 | Jul 9 – Aug 27 | 90–120 |
| Yard Long Beans | Feb 5 | Apr 2 | Apr 9 | Jun 4 – Jul 16 | 55–80 |
| Zucchini | Feb 26 | Apr 2 | Apr 9 | May 28 – Jul 23 | 45–60 |
🍓 Fruits to Grow in Johnson County
31 fruits that grow well in Zone 7a with planting dates for Johnson County.
Show all 31 fruits with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Alpine Strawberries | — | — | Apr 16 | Jul 16 – Oct 29 | 90–180 |
| Aronia | — | — | Apr 16 | — | 730–1095 |
| Blackberries | — | — | Apr 16 | — | 365–730 |
| Blueberries | — | — | Apr 16 | — | 730–1095 |
| Boysenberries | — | — | Apr 16 | — | 365–730 |
| Cantaloupe | — | — | Apr 16 | Jun 25 – Jul 30 | 70–90 |
| Che Fruit | — | — | Apr 16 | — | 1095–1825 |
| Cranberries | — | — | Apr 16 | — | 730–1095 |
| Currants | — | — | Apr 16 | — | 730–1095 |
| Elderberries | — | — | Apr 16 | — | 730–1095 |
| Figs | — | — | Apr 16 | — | 730–1825 |
| Goji Berries | — | — | Apr 16 | — | 730–1095 |
| Gooseberries | — | — | Apr 16 | — | 730–1095 |
| Grapes | — | — | Apr 16 | — | 730–1095 |
| Ground Cherry | — | — | Apr 16 | Jun 25 – Aug 20 | 65–80 |
| Hardy Kiwi | — | — | Apr 16 | — | 1095–1825 |
| Haskaps | — | — | Apr 16 | — | 730–1095 |
| Honeydew | — | — | Apr 16 | Jul 9 – Aug 20 | 80–110 |
| Jostaberry | — | — | Apr 16 | — | 730–1095 |
| Kiwi | — | — | Apr 16 | — | 1095–1825 |
| Lingonberries | — | — | Apr 16 | — | 730–1095 |
| Loquat | — | — | Apr 16 | — | 730–1825 |
| Medlar | — | — | Apr 16 | — | 1095–1825 |
| Mulberries | — | — | Apr 16 | — | 730–1825 |
| Pawpaw | — | — | Apr 16 | — | 1095–2555 |
| Persimmon | — | — | Apr 16 | — | 1095–2555 |
| Pomegranate | — | — | Apr 16 | — | 730–1095 |
| Quince | — | — | Apr 16 | — | 1095–1825 |
| Raspberries | — | — | Apr 16 | — | 365–730 |
| Serviceberries | — | — | Apr 16 | — | 730–1095 |
| Strawberries | — | — | Apr 16 | Jul 16 – Nov 26 | 90–365 |
🌿 Herbs to Grow in Johnson County
39 herbs that grow well in Zone 7a with planting dates for Johnson County.
Show all 39 herbs with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Angelica | Feb 19 | Mar 12 | Mar 19 | — | 365–730 |
| Anise | Feb 19 | Mar 12 | Mar 19 | Jun 18 – Sep 3 | 90–120 |
| Basil | Feb 5 | Apr 2 | Apr 9 | Jun 4 – Aug 6 | 50–75 |
| Bee Balm | — | — | Apr 2 | Jul 2 – Sep 17 | 90–120 |
| Borage | Feb 19 | Mar 12 | Mar 19 | May 14 – Jul 2 | 50–60 |
| Caraway | Feb 19 | Mar 12 | Mar 19 | — | 365–450 |
| Catnip | — | — | Apr 2 | Jun 4 – Aug 6 | 60–80 |
| Chamomile | Feb 19 | Mar 12 | Mar 19 | May 21 – Jul 30 | 60–90 |
| Chervil | Feb 19 | Mar 12 | Mar 19 | Apr 30 – Jul 2 | 40–60 |
| Chives | — | — | Apr 2 | Jun 4 – Aug 13 | 60–90 |
| Cilantro | Feb 19 | Mar 12 | Mar 19 | Apr 30 – Jul 2 | 40–60 |
| Comfrey | — | — | Apr 2 | Jun 4 – Aug 13 | 60–90 |
| Cumin | Feb 19 | Mar 12 | Mar 19 | Jul 2 – Sep 3 | 100–120 |
| Dill | Feb 19 | Mar 12 | Mar 19 | Apr 30 – Jul 2 | 40–60 |
| Echinacea | — | — | Apr 2 | Aug 6 – Nov 12 | 120–180 |
| Epazote | Feb 5 | Apr 2 | Apr 9 | May 28 – Jul 23 | 45–60 |
| Fennel (herb) | Feb 19 | Mar 12 | Mar 19 | May 21 – Jul 30 | 60–90 |
| Feverfew | — | — | Apr 2 | Jul 2 – Sep 17 | 90–120 |
| Garlic Chives | — | — | Apr 2 | Jun 4 – Aug 13 | 60–90 |
| Horehound | — | — | Apr 2 | Jun 18 – Aug 13 | 75–90 |
| Hyssop | — | — | Apr 2 | Jun 11 – Aug 13 | 70–90 |
| Lavender | — | — | Apr 2 | Jul 2 – Nov 12 | 90–200 |
| Lemon Balm | — | — | Apr 2 | Jun 4 – Jul 23 | 60–70 |
| Lemon Thyme | — | — | Apr 2 | Jun 11 – Aug 13 | 70–90 |
| Lovage | — | — | Apr 2 | Jun 11 – Aug 13 | 70–90 |
| Marjoram | — | — | Apr 2 | Jun 4 – Aug 13 | 60–90 |
| Mint | — | — | Apr 2 | Jun 4 – Aug 13 | 60–90 |
| Oregano | — | — | Apr 2 | Jun 4 – Aug 13 | 60–90 |
| Parsley | Feb 19 | Mar 12 | Mar 19 | May 21 – Jul 23 | 60–80 |
| Rosemary | — | — | Apr 2 | Jun 25 – Nov 12 | 80–180 |
| Rue | — | — | Apr 2 | Jun 11 – Aug 13 | 70–90 |
| Sage | — | — | Apr 2 | Jun 18 – Aug 13 | 75–90 |
| Savory | — | — | Apr 2 | May 28 – Jul 23 | 50–70 |
| Sorrel | Feb 19 | Mar 12 | Mar 19 | Apr 30 – Jul 2 | 40–60 |
| Tarragon | — | — | Apr 2 | Jun 4 – Aug 13 | 60–90 |
| Thai Basil | Feb 5 | Apr 2 | Apr 9 | Jun 4 – Aug 6 | 50–75 |
| Thyme | — | — | Apr 2 | Jun 11 – Aug 13 | 70–90 |
| Valerian | — | — | Apr 2 | Aug 6 – Nov 12 | 120–180 |
| Yarrow | — | — | Apr 2 | Jul 2 – Sep 17 | 90–120 |
Monthly Planting Guide for Johnson County
Gardening Guides & Resources
Helpful guides from The Ultimate Homestead to improve your garden in Johnson County.
Frequently Asked Questions
What planting zone is Johnson County, AR?
Johnson County is in USDA Hardiness Zone 7a. 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 Johnson County, AR?
Based on 31 years of NOAA weather station data, the median last spring frost in Johnson County falls around March 26. In 8 out of 10 years, last frost lands between March 8 and April 9 — a 32-day window of variability. Use April 9 as your conservative safe-to-plant date for frost-sensitive crops.
When is the first fall frost in Johnson County, AR?
The median first fall frost in Johnson County arrives around November 3. In cold years it can arrive as early as October 18; 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 Johnson County?
Johnson County has a frost-free growing season of approximately 222 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 longer by about 1.72 days per decade.
What is the soil like in Johnson County for gardening?
Johnson County has predominantly Silt Loam soil with a pH range of 5.3–7 and Moderately Well Drained drainage. Most vegetables and herbs grow well with standard composting and seasonal soil amendment.
What is grown commercially in Johnson County?
Johnson County has commercial agriculture that includes Rice, Soybeans, Poultry. These crops reflect the local climate and soil conditions — what succeeds commercially often translates well to home gardens in the same area.
Is Johnson County a good location for home gardening?
Johnson 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 Johnson County gardeners in Zone 7a 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.
