Harper County, KS — Planting Guide
Harper County is in USDA Zone 6b. The average last spring frost is April 9 and the first fall frost is October 27, giving you a growing season of approximately 201 days.
At an elevation of 745 ft, Harper County receives approximately 27.7 in of rainfall annually. Summer highs average 88°F with winter lows around 24°F. The predominant soil type is Loam.
Based on 31 years of NOAA climate station data, the last frost date here varies by 31 days year to year — ranging from March 22 in warm years to April 22 in cold years. The growing season is trending shorter by about 1.03 days per decade. Harper County scores 66/100 (Good) on the Microclimate Index.
🌡️ Zone
6b (-5°F to 0°F min)
❄️ Last Frost
April 9
🍂 First Frost
October 27
📅 Growing Season
201 days
⛰️ Elevation
745 ft
🌧️ Annual Rainfall
27.7 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 | 0.7 in | 4 days | — | None |
| Feb | 1.1 in | 5 days | — | None |
| Mar | 1.6 in | 6 days | 2.7 in | High |
| Apr | 2.6 in | 8 days | 1.7 in | High |
| May | 4.5 in | 8 days | — | Low |
| Jun | 4.1 in | 8 days | 0.2 in | Low |
| Jul | 3.6 in | 8 days | 0.7 in | Moderate |
| Aug | 3.3 in | 7 days | 1 in | Moderate |
| Sep | 2.7 in | 6 days | 1.6 in | High |
| Oct | 1.9 in | 5 days | 2.4 in | High |
| Nov | 1 in | 3 days | — | None |
| Dec | 0.7 in | 4 days | — | None |
Annual total: 27.8 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.
Harper County Soil Profile
Soil Type
Loam
Soil pH
6.2-7.8
Drainage
Well Drained
Frost Risk Probability
Based on 31 years of NOAA weather station data from 3 stations
Beginners: Plant frost-sensitive crops (tomatoes, peppers, squash) after the "Safe" date on the left. Harvest or cover them before the "Protect by" date on the right. Hardy crops (lettuce, peas, kale) can go in the yellow transition zones.
How to read this table: "Conservative" means you're safe from frost 9 out of 10 years — best for beginners and frost-sensitive crops. "Average year" is the typical date. "Aggressive" means only 1 in 10 years is that warm — experienced gardeners with frost protection can try these dates.
| Planting Strategy | Last Spring Frost | First Fall Frost | Frost-Free Days |
|---|---|---|---|
| Conservative (safest) | Apr 22 | Nov 12 | 204 days |
| Cautious | Apr 14 | Nov 4 | 204 days |
| Average year | Apr 9 | Oct 27 | 201 days |
| Optimistic | Apr 3 | Oct 23 | 203 days |
| Aggressive (risky) | Mar 22 | Oct 14 | 206 days |
Not very — frost dates can vary by ±31 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 days per decade). Use the "Conservative" dates and choose fast-maturing varieties.
Gardening Difficulty Score
Harper County offers good growing conditions. A little planning around frost dates goes a long way.
Local Gardening Help in Harper 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 Harper County's climate and soil.
County Extension Office
Harper County Kansas State University Extension Extension Office
Phone: 785-532-5820
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 Harper County
Finding local nurseries & garden centers in Harper County
Why Buy Local
Local nurseries carry plants that are proven to grow in your area. Staff can give you advice specific to Harper 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 Harper County KS" or "garden center Harper 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 Harper County KS" or check your extension office and local parks department. Facebook groups like "Harper County Gardeners" or "Kansas 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
10.1 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 | 5.1 hr | Short day |
| February | 10.6 hr | 6.4 hr | Short day |
| March | 11.7 hr | 7.3 hr | Short day |
| April | 13 hr | 8.3 hr | Neutral |
| May | 14 hr | 8.4 hr | Long day |
| June | 14.5 hr | 10.1 hr | Long day |
| July | 14.3 hr | 9.8 hr | Long day |
| August | 13.4 hr | 9.4 hr | Neutral |
| September | 12.2 hr | 8.4 hr | Neutral |
| October | 11 hr | 6.8 hr | Short day |
| November | 10 hr | 5.6 hr | Short day |
| December | 9.5 hr | 5.1 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
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 | 30°F | 41°F | ❄️ Dormant | ~36 weeks |
| Feb | 34°F | 39°F | ❄️ Dormant | ~36 weeks |
| Mar | 39°F | 43°F | ❄️ Dormant | ~36 weeks |
| Apr | 50°F | 51°F | 🐢 Slow | ~24 weeks |
| May | 64°F | 59°F | ♻️ Active | ~14 weeks |
| Jun | 72°F | 69°F | 🔥 Peak | ~8 weeks |
| Jul | 81°F | 77°F | 🔥 Peak | ~8 weeks |
| Aug | 82°F | 79°F | 🔥 Peak | ~8 weeks |
| Sep | 76°F | 75°F | 🔥 Peak | ~8 weeks |
| Oct | 64°F | 67°F | ♻️ Active | ~14 weeks |
| Nov | 50°F | 55°F | 🐢 Slow | ~24 weeks |
| Dec | 38°F | 46°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 Harper 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 | High | Jun, Jul, Aug |
| Squash vine borers | Moderate | Jun, Jul |
| Tomato hornworms | Moderate | Jun, Jul, Aug |
| Cucumber beetles | Low | May, Jun, Jul |
| Stink bugs | Moderate | Jun, Jul, Aug, Sep |
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 Harper 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 29 | Mar 26 | ✓ Yes | Fixes nitrogen, good for heavy clay soils |
| Crimson clover | Aug 29 | Mar 26 | ✓ Yes | Fixes nitrogen, attracts pollinators in spring |
| Daikon radish | Sep 11 | Mar 19 | — | Deep taproot breaks compaction, excellent for clay soils |
| Hairy vetch | Aug 1 | Mar 26 | ✓ Yes | Excellent nitrogen fixer, good for depleted soils |
| Oats | Sep 21 | Mar 19 | — | Quick biomass, winterkills in cold zones — no spring tillage needed |
| Winter rye | Aug 7 | Mar 26 | — | Suppresses weeds, prevents erosion, breaks up compacted soil |
| Winter wheat | Jul 22 | Mar 26 | — | 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 16 | Aug 18 | — | Rapid growth, attracts pollinators, suppresses weeds |
| Sorghum-sudan grass | Apr 20 | Aug 18 | — | Massive biomass, breaks compaction, suppresses nematodes |
| White clover | Mar 13 | 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 | Apr 28 | 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: 15 mph Summer: 13 mph
Fall: 14 mph Winter: 16 mph
Prevailing wind: S. Windy area — plant a windbreak hedge on the S side of your garden.
Windbreak Benefit
8.6/10
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 (309 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
13,855 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 2,250 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, 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 27.8 inches of rain per year
- A 1,000 sq ft roof can collect roughly 13,855 gallons annually
- Rainwater harvesting is fully legal in your state
- Use a first-flush diverter to keep roof debris out of your collection
Soil & Growing Conditions in Harper County
Soil Type
Loam
Soil pH 6.2–7.8 · Excessively 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
201-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 Harper County
108 vegetables that grow well in Zone 6b with planting dates for Harper County.
Show all 108 vegetables with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Acorn Squash | Mar 5 | Apr 16 | Apr 23 | Jul 16 – Aug 20 | 80–100 |
| Amaranth | Feb 12 | Apr 16 | Apr 23 | Jul 23 – Sep 10 | 90–120 |
| Arugula | Mar 5 | Mar 26 | Apr 9 | May 14 – Jul 16 | 30–50 |
| Asparagus | — | — | Apr 23 | — | 730–1095 |
| Beets | — | Mar 26 | — | May 21 – Jun 18 | 50–70 |
| Belgian Endive | Mar 5 | Mar 26 | Apr 9 | Jul 30 – Sep 24 | 110–150 |
| Bitter Melon | Feb 12 | Apr 16 | Apr 23 | Jun 25 – Aug 6 | 60–90 |
| Black Beans | — | Apr 16 | — | Jul 16 – Sep 3 | 90–120 |
| Bok Choy | Mar 5 | Mar 26 | Apr 9 | May 21 – Jun 25 | 40–60 |
| Broccoli | Mar 5 | Mar 26 | Apr 9 | Jun 11 – Jul 23 | 60–90 |
| Broccoli Rabe | Mar 5 | Mar 26 | Apr 9 | May 21 – Jun 25 | 40–60 |
| Brussels Sprouts | Mar 5 | Mar 26 | Apr 9 | Jul 9 – Sep 3 | 90–130 |
| Butternut Squash | Mar 5 | Apr 16 | Apr 23 | Jul 23 – Aug 27 | 85–110 |
| Cabbage | Mar 5 | Mar 26 | Apr 9 | Jun 11 – Aug 6 | 60–100 |
| Calabash | Feb 12 | Apr 16 | Apr 23 | Jul 16 – Sep 10 | 80–120 |
| Carrots | — | Mar 26 | — | May 28 – Jul 2 | 60–80 |
| Cauliflower | Mar 5 | Mar 26 | Apr 9 | Jun 4 – Aug 6 | 55–100 |
| Celeriac | Mar 5 | Mar 26 | Apr 9 | Jul 23 – Aug 27 | 100–120 |
| Celery | Mar 5 | Mar 26 | Apr 9 | Jul 2 – Aug 27 | 80–120 |
| Celtuce | Mar 5 | Mar 26 | Apr 9 | Jun 11 – Jul 23 | 60–90 |
| Chard | Mar 5 | Mar 26 | Apr 9 | Jun 4 – Jul 23 | 50–60 |
| Chickpeas | Mar 5 | Mar 26 | Apr 9 | Jul 2 – Aug 13 | 80–110 |
| Chicory | Mar 5 | Mar 26 | Apr 9 | Jun 11 – Jul 23 | 60–85 |
| Chinese Cabbage | Mar 5 | Mar 26 | Apr 9 | Jun 4 – Jul 2 | 50–70 |
| Christmas Lima Beans | Feb 12 | Apr 16 | Apr 23 | Jul 16 – Aug 20 | 80–100 |
| Collard Greens | Mar 5 | Mar 26 | Apr 9 | Jun 4 – Aug 6 | 55–75 |
| Corn | — | Apr 16 | — | Jun 18 – Aug 13 | 60–100 |
| Cowpeas | — | Apr 16 | — | Jun 18 – Jul 30 | 60–90 |
| Cress | Mar 5 | Mar 26 | Apr 9 | Apr 23 – May 14 | 14–21 |
| Crookneck Squash | Mar 5 | Apr 16 | Apr 23 | Jun 11 – Jul 9 | 45–60 |
| Crosne | — | Mar 26 | — | Aug 27 – Oct 8 | 150–200 |
| Cucumber | Mar 5 | Apr 16 | Apr 23 | Jun 18 – Aug 13 | 50–70 |
| Daikon | — | Mar 26 | — | May 21 – Jun 18 | 50–70 |
| Delicata Squash | Mar 5 | Apr 16 | Apr 23 | Jul 16 – Aug 20 | 80–100 |
| Edamame | — | Apr 16 | — | Jul 2 – Aug 13 | 75–100 |
| Eggplant | Jan 29 | Apr 16 | Apr 23 | Jul 2 – Sep 3 | 65–85 |
| Endive | Mar 5 | Mar 26 | Apr 9 | May 28 – Jul 2 | 45–65 |
| Escarole | Mar 5 | Mar 26 | Apr 9 | Jun 4 – Jul 2 | 50–70 |
| Fava Beans | Mar 5 | Mar 26 | Apr 9 | Jun 25 – Aug 6 | 75–100 |
| Fennel | Feb 12 | Apr 16 | Apr 23 | Jun 25 – Aug 6 | 60–90 |
| Garlic | — | — | — | — | 90–240 |
| Green Beans | — | Apr 16 | — | Jun 11 – Aug 6 | 50–65 |
| Horseradish | — | — | Apr 23 | Aug 27 – Nov 5 | 120–180 |
| Hot Peppers | Jan 29 | Apr 16 | Apr 23 | Jul 2 – Oct 8 | 70–120 |
| Hubbard Squash | Mar 5 | Apr 16 | Apr 23 | Aug 6 – Sep 10 | 100–120 |
| Kabocha | Mar 5 | Apr 16 | Apr 23 | Jul 23 – Aug 20 | 85–100 |
| Kai Lan | Mar 5 | Mar 26 | Apr 9 | May 28 – Jun 25 | 45–60 |
| Kale | Mar 5 | Mar 26 | Apr 9 | Jun 4 – Jul 30 | 50–70 |
| Kidney Beans | — | Apr 16 | — | Jul 16 – Aug 20 | 85–110 |
| Kohlrabi | Mar 5 | Mar 26 | Apr 9 | May 28 – Jul 2 | 45–65 |
| Komatsuna | Mar 5 | Mar 26 | Apr 9 | May 14 – Jun 18 | 35–50 |
| Leeks | Mar 5 | Mar 26 | Apr 9 | Jul 9 – Sep 24 | 90–150 |
| Lentils | Mar 5 | Mar 26 | Apr 9 | Jul 2 – Aug 13 | 80–110 |
| Lettuce | Mar 5 | Mar 26 | Apr 9 | May 14 – Jul 23 | 30–60 |
| Lima Beans | — | Apr 16 | — | Jun 18 – Jul 30 | 60–90 |
| Loofah | Feb 12 | Apr 16 | Apr 23 | Aug 6 – Oct 8 | 100–150 |
| Luffa | Feb 12 | Apr 16 | Apr 23 | Jul 23 – Oct 8 | 90–150 |
| Mache | Mar 5 | Mar 26 | Apr 9 | May 21 – Jun 25 | 40–60 |
| Melon | Mar 5 | Apr 16 | Apr 23 | Jul 2 – Aug 20 | 70–100 |
| Microgreens | Mar 5 | Mar 26 | Apr 9 | Apr 16 – May 14 | 7–21 |
| Mitsuba | Mar 5 | Mar 26 | Apr 2 | May 28 – Jul 23 | 50–70 |
| Mizuna | Mar 5 | Mar 26 | Apr 9 | May 14 – Jun 11 | 30–45 |
| Mustard Greens | Mar 5 | Mar 26 | Apr 9 | May 14 – Jul 16 | 30–50 |
| Napa Cabbage | Mar 5 | Mar 26 | Apr 9 | Jun 4 – Jul 9 | 55–75 |
| New Zealand Spinach | Feb 12 | Apr 16 | Apr 23 | Jun 18 – Jul 16 | 55–70 |
| Okra | Feb 12 | Apr 16 | Apr 23 | Jun 18 – Aug 13 | 50–65 |
| Onion | Mar 5 | Mar 26 | Apr 9 | Jul 9 – Aug 27 | 90–120 |
| Pac Choi | Mar 5 | Mar 26 | Apr 9 | May 21 – Jun 18 | 40–55 |
| Parsnip | — | Mar 26 | — | Jul 9 – Aug 20 | 100–130 |
| Patty Pan Squash | Mar 5 | Apr 16 | Apr 23 | Jun 11 – Jul 9 | 45–60 |
| Peas | Mar 5 | Mar 26 | Apr 9 | Jun 4 – Jul 30 | 55–70 |
| Peppers | Jan 29 | Apr 16 | Apr 23 | Jun 25 – Sep 3 | 60–90 |
| Pole Beans | Feb 12 | Apr 16 | Apr 23 | Jun 18 – Aug 13 | 55–70 |
| Potatoes | Feb 12 | Apr 16 | Apr 23 | Jul 2 – Sep 10 | 70–120 |
| Pumpkin | Mar 5 | Apr 16 | Apr 23 | Jul 23 – Sep 10 | 85–120 |
| Purslane | Mar 5 | Mar 26 | Apr 9 | May 21 – Jun 25 | 40–60 |
| Radicchio | Mar 5 | Mar 26 | Apr 9 | Jun 11 – Jul 16 | 60–80 |
| Radish | — | Mar 26 | — | Apr 23 – May 14 | 22–35 |
| Rhubarb | — | — | Apr 30 | — | 365–730 |
| Romanesco | Mar 5 | Mar 26 | Apr 9 | Jun 25 – Aug 6 | 75–100 |
| Rutabaga | — | Mar 26 | — | Jun 18 – Jul 23 | 80–100 |
| Salsify | — | Mar 26 | — | Jul 9 – Aug 20 | 100–130 |
| Savoy Cabbage | Mar 5 | Mar 26 | Apr 9 | Jun 18 – Aug 13 | 70–110 |
| Scallions | Mar 5 | Mar 26 | Apr 9 | Jun 4 – Jul 2 | 50–70 |
| Scarlet Runner Beans | Feb 12 | Apr 16 | Apr 23 | Jun 25 – Jul 30 | 60–80 |
| Shallot | Mar 5 | Mar 26 | Apr 9 | Jul 9 – Aug 27 | 90–120 |
| Shiso | Feb 19 | Apr 16 | Apr 23 | Jun 18 – Aug 13 | 50–70 |
| Snap Peas | Feb 12 | Apr 16 | Apr 23 | Jun 18 – Aug 13 | 55–70 |
| Snow Peas | Mar 5 | Mar 26 | Apr 9 | Jun 4 – Jul 30 | 50–65 |
| Soybeans | — | Apr 16 | — | Jul 9 – Sep 3 | 80–120 |
| Spaghetti Squash | Mar 5 | Apr 16 | Apr 23 | Jul 23 – Aug 20 | 85–100 |
| Spinach | Mar 5 | Mar 26 | Apr 9 | May 14 – Jul 16 | 35–50 |
| Squash (Summer) | Mar 5 | Apr 16 | Apr 23 | Jun 11 – Aug 13 | 45–65 |
| Squash (Winter) | Mar 5 | Apr 16 | Apr 23 | Jul 16 – Sep 10 | 80–120 |
| Sunchoke | — | — | Apr 23 | Aug 13 – Oct 8 | 110–150 |
| Sunflower | Feb 12 | Apr 16 | Apr 23 | Jul 2 – Aug 20 | 70–100 |
| Sweet Corn | — | Apr 16 | — | Jun 18 – Jul 30 | 60–90 |
| Sweet Potatoes | Feb 12 | Apr 16 | Apr 23 | Jul 23 – Sep 10 | 90–120 |
| Tatsoi | Mar 5 | Mar 26 | Apr 9 | May 14 – Jun 18 | 35–50 |
| Tomatillo | Feb 12 | Apr 16 | Apr 23 | Jun 25 – Sep 3 | 60–85 |
| Tomatoes | Feb 12 | Apr 16 | Apr 23 | Jun 25 – Sep 3 | 60–85 |
| Turnip | — | Mar 26 | — | May 7 – Jun 11 | 40–60 |
| Watercress | Mar 5 | Mar 26 | Apr 9 | May 21 – Jun 25 | 40–60 |
| Watermelon | Mar 5 | Apr 16 | Apr 23 | Jul 2 – Aug 20 | 70–100 |
| Wax Beans | — | Apr 16 | — | Jun 11 – Aug 6 | 50–65 |
| Winter Melon | Feb 12 | Apr 16 | Apr 23 | Jul 23 – Sep 10 | 90–120 |
| Yard Long Beans | Feb 12 | Apr 16 | Apr 23 | Jun 18 – Jul 30 | 55–80 |
| Zucchini | Mar 5 | Apr 16 | Apr 23 | Jun 11 – Aug 6 | 45–60 |
🍓 Fruits to Grow in Harper County
27 fruits that grow well in Zone 6b with planting dates for Harper County.
Show all 27 fruits with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Alpine Strawberries | — | — | Apr 30 | Jul 30 – Nov 12 | 90–180 |
| Aronia | — | — | Apr 30 | — | 730–1095 |
| Blackberries | — | — | Apr 30 | — | 365–730 |
| Blueberries | — | — | Apr 30 | — | 730–1095 |
| Boysenberries | — | — | Apr 30 | — | 365–730 |
| Cantaloupe | — | — | Apr 30 | Jul 9 – Aug 13 | 70–90 |
| Che Fruit | — | — | Apr 30 | — | 1095–1825 |
| Cranberries | — | — | Apr 30 | — | 730–1095 |
| Currants | — | — | Apr 30 | — | 730–1095 |
| Elderberries | — | — | Apr 30 | — | 730–1095 |
| Goji Berries | — | — | Apr 30 | — | 730–1095 |
| Gooseberries | — | — | Apr 30 | — | 730–1095 |
| Grapes | — | — | Apr 30 | — | 730–1095 |
| Ground Cherry | — | — | Apr 30 | Jul 9 – Sep 3 | 65–80 |
| Hardy Kiwi | — | — | Apr 30 | — | 1095–1825 |
| Haskaps | — | — | Apr 30 | — | 730–1095 |
| Honeydew | — | — | Apr 30 | Jul 23 – Sep 3 | 80–110 |
| Jostaberry | — | — | Apr 30 | — | 730–1095 |
| Lingonberries | — | — | Apr 30 | — | 730–1095 |
| Medlar | — | — | Apr 30 | — | 1095–1825 |
| Mulberries | — | — | Apr 30 | — | 730–1825 |
| Pawpaw | — | — | Apr 30 | — | 1095–2555 |
| Persimmon | — | — | Apr 30 | — | 1095–2555 |
| Quince | — | — | Apr 30 | — | 1095–1825 |
| Raspberries | — | — | Apr 30 | — | 365–730 |
| Serviceberries | — | — | Apr 30 | — | 730–1095 |
| Strawberries | — | — | Apr 30 | Jul 30 – Nov 12 | 90–365 |
🌿 Herbs to Grow in Harper County
38 herbs that grow well in Zone 6b with planting dates for Harper County.
Show all 38 herbs with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Angelica | Mar 5 | Mar 26 | Apr 2 | — | 365–730 |
| Anise | Mar 5 | Mar 26 | Apr 2 | Jul 2 – Sep 17 | 90–120 |
| Basil | Feb 19 | Apr 16 | Apr 23 | Jun 18 – Aug 20 | 50–75 |
| Bee Balm | — | — | Apr 16 | Jul 16 – Oct 1 | 90–120 |
| Borage | Mar 5 | Mar 26 | Apr 2 | May 28 – Jul 16 | 50–60 |
| Caraway | Mar 5 | Mar 26 | Apr 2 | — | 365–450 |
| Catnip | — | — | Apr 16 | Jun 18 – Aug 20 | 60–80 |
| Chamomile | Mar 5 | Mar 26 | Apr 2 | Jun 4 – Aug 13 | 60–90 |
| Chervil | Mar 5 | Mar 26 | Apr 2 | May 14 – Jul 16 | 40–60 |
| Chives | — | — | Apr 16 | Jun 18 – Aug 27 | 60–90 |
| Cilantro | Mar 5 | Mar 26 | Apr 2 | May 14 – Jul 16 | 40–60 |
| Comfrey | — | — | Apr 16 | Jun 18 – Aug 27 | 60–90 |
| Cumin | Mar 5 | Mar 26 | Apr 2 | Jul 16 – Sep 17 | 100–120 |
| Dill | Mar 5 | Mar 26 | Apr 2 | May 14 – Jul 16 | 40–60 |
| Echinacea | — | — | Apr 16 | Aug 20 – Oct 29 | 120–180 |
| Epazote | Feb 19 | Apr 16 | Apr 23 | Jun 11 – Aug 6 | 45–60 |
| Fennel (herb) | Mar 5 | Mar 26 | Apr 2 | Jun 4 – Aug 13 | 60–90 |
| Feverfew | — | — | Apr 16 | Jul 16 – Oct 1 | 90–120 |
| Garlic Chives | — | — | Apr 16 | Jun 18 – Aug 27 | 60–90 |
| Horehound | — | — | Apr 16 | Jul 2 – Aug 27 | 75–90 |
| Hyssop | — | — | Apr 16 | Jun 25 – Aug 27 | 70–90 |
| Lavender | — | — | Apr 16 | Jul 16 – Oct 29 | 90–200 |
| Lemon Balm | — | — | Apr 16 | Jun 18 – Aug 6 | 60–70 |
| Lemon Thyme | — | — | Apr 16 | Jun 25 – Aug 27 | 70–90 |
| Lovage | — | — | Apr 16 | Jun 25 – Aug 27 | 70–90 |
| Marjoram | — | — | Apr 16 | Jun 18 – Aug 27 | 60–90 |
| Mint | — | — | Apr 16 | Jun 18 – Aug 27 | 60–90 |
| Oregano | — | — | Apr 16 | Jun 18 – Aug 27 | 60–90 |
| Parsley | Mar 5 | Mar 26 | Apr 2 | Jun 4 – Aug 6 | 60–80 |
| Rue | — | — | Apr 16 | Jun 25 – Aug 27 | 70–90 |
| Sage | — | — | Apr 16 | Jul 2 – Aug 27 | 75–90 |
| Savory | — | — | Apr 16 | Jun 11 – Aug 6 | 50–70 |
| Sorrel | Mar 5 | Mar 26 | Apr 2 | May 14 – Jul 16 | 40–60 |
| Tarragon | — | — | Apr 16 | Jun 18 – Aug 27 | 60–90 |
| Thai Basil | Feb 19 | Apr 16 | Apr 23 | Jun 18 – Aug 20 | 50–75 |
| Thyme | — | — | Apr 16 | Jun 25 – Aug 27 | 70–90 |
| Valerian | — | — | Apr 16 | Aug 20 – Oct 29 | 120–180 |
| Yarrow | — | — | Apr 16 | Jul 16 – Oct 1 | 90–120 |
Monthly Planting Guide for Harper County
Gardening Guides & Resources
Helpful guides from The Ultimate Homestead to improve your garden in Harper County.
Frequently Asked Questions
What planting zone is Harper County, KS?
Harper 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 Harper County, KS?
Based on 31 years of NOAA weather station data, the median last spring frost in Harper County falls around April 9. In 8 out of 10 years, last frost lands between March 22 and April 22 — a 31-day window of variability. Use April 22 as your conservative safe-to-plant date for frost-sensitive crops.
When is the first fall frost in Harper County, KS?
The median first fall frost in Harper County arrives around October 27. In cold years it can arrive as early as October 14; in mild years as late as November 12. Harvest or protect frost-sensitive crops — tomatoes, peppers, basil, squash — before this date.
How long is the growing season in Harper County?
Harper County has a frost-free growing season of approximately 201 days. This long season supports multiple succession plantings and warm-season crops that need extended heat, like sweet potatoes and melons. Climate records show the growing season is trending shorter by about 1.03 days per decade.
What is the soil like in Harper County for gardening?
Harper County has predominantly Loam soil with a pH range of 6.2–7.8 and Excessively Drained drainage. Most vegetables and herbs grow well with standard composting and seasonal soil amendment.
What is grown commercially in Harper County?
Harper County has commercial agriculture that includes Corn, Wheat, Soybeans. These crops reflect the local climate and soil conditions — what succeeds commercially often translates well to home gardens in the same area.
Is Harper County a good location for home gardening?
Harper 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 Harper 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.
