Lawn Care Guide for Clark County
Clark County, Kansas
USDA SSURGO / PHZMData Story
About Lawn Care in Clark County, Kansas
Intense Heat Drives High Lawn Difficulty
Clark County is one of the most challenging places in Kansas for lawn care, with a score of just 41.1. This Zone 6b county trails far behind the state average of 59.1 due to extreme temperature swings and low rainfall. Maintaining a traditional green lawn here requires significant effort and resources.
Eighty-Four Days of Extreme Heat
The county endures a staggering 84 days over 90°F annually, nearly 50% more than the state average. Combined with only 23.0 inches of precipitation, this heat creates a high-evaporation environment that is tough on turf. The 4,474 growing degree days indicate a fast, hot growing season that can easily scorch sensitive grass types.
Fine Sandy Loam with High pH
The soil consists of 44.3% sand and is classified as well-drained, meaning it won't hold moisture long during heatwaves. A pH of 7.46 is on the alkaline side, which may require iron treatments to prevent grass from yellowing. This fine sandy loam foundation offers good aeration but demands very consistent supplemental watering.
Maintaining Turf in a Dry Climate
With 96.0% of the county abnormally dry and 15 weeks of drought in the last year, water management is the top priority. Local gardeners should prioritize water-saving tech like smart irrigation controllers or drip lines. High heat and low rain make native, deep-rooted vegetation a more sustainable alternative to standard turf.
Tough Grasses for a Tough Climate
Warm-season grasses like Bermuda or native Buffalograss are the most likely to survive the 84 days of extreme heat. Planting should occur after the April 21 frost date to give roots time to establish before the peak summer heat. Aim for completion before the first fall frost on October 17.
Lawn Difficulty Score
Top Grass Fit for Clark County
Excellent match
Jonathan Green Black Beauty Ultra
Jonathan Green
Top cultivar score: 86/100
Zone 6b vs Tall Fescue's 3–8 band.
Soil pH 7.45919091296872 vs Tall Fescue's 5.5–6.5 window.
Precipitation 23" + soil AWC vs Tall Fescue's 20–30" need.
Growing-degree-days + frost window vs a intermediate-difficulty establishment.
If you spend any time on lawn care forums, Reddit's r/lawncare, or YouTube lawn channels, one name comes up more than any other: Jonathan Green Black Beauty Ultra. It's practically a cult favorite, and the label, cultivar story, and long-running owner reports explain why. The secret is in the genetics.
In Clark County, USDA zone 6b, soil pH 7.5, fine sandy loam, Jonathan Green Black Beauty Ultra scores 86/100 — a strong zone match, adequate moisture, and a long enough establishment window.
Recommended Grasses
Buffalograss
Bouteloua dactyloides
Blue Grama
Bouteloua gracilis
Tall Fescue
Festuca arundinacea
Best Grass Seed for Clark County
Zone 6b • Cool- and warm-season grasses thrive here.
Find Seeds for Zone 6bClimate Snapshot
Annual Precip
23.0"
Growing Degree Days
4,474.3
Base 50F
Last Spring Frost
04/21
First Fall Frost
10/17
Days Above 95F
84
Hardiness Zone
6b
Seeding Calendar — Zone 6B
Seasonal Lawn Care Checklist
Spring
- Apply pre-emergent herbicide when soil reaches 55F
- Begin mowing when grass reaches 3 inches
- Start irrigation if rainfall is below 1 inch/week
- Soil test every 2-3 years — adjust lime or sulfur as needed
Summer
- Mow at recommended height weekly
- Water deeply 1-2 times per week (1 inch total)
- Avoid fertilizing cool-season grasses in peak heat
- Scout for grubs and treat if >10 per sq ft
Fall
- Overseed warm-season lawns if thinning
- Apply fall fertilizer (highest N application for cool-season)
- Continue mowing until growth stops
- Rake or mulch leaves to prevent smothering
Winter
- Apply pre-emergent for winter weeds
- Service mower and sharpen blades
- Plan spring soil amendments based on fall test
- Keep lawn clear of debris
Watering Deficit Calculator
Monthly Deficit
2.1"
inches of water
Monthly Water
6,626
gallons
Estimated Monthly Cost
$53.01
at $0.008/gallon average
Estimates based on 23" annual precipitation and estimated evapotranspiration. Actual costs vary by local water rates.
Common Lawn Problems in Clark County
Drought Stress
With only 23 inches of annual rainfall, lawns in Clark County face significant drought stress. Consider drought-tolerant grass species and deep, infrequent watering.
Learn more about regional lawn challenges at The Lawn Report.
Lawn Care Advisory: Clark County
Lawn Verdict
Clark County sits in USDA hardiness zone 6b, a transitional zone where cool-season grasses dominate but some warm-season varieties can survive. with winter lows reaching around -5.0°F. and 4,474.3 growing degree days annually, supporting vigorous warm-season lawns. Moderate rainfall (23.0 inches) generally supports healthy lawns with minimal supplemental watering.
Seasonal Breakdown
Wait until after April 21 to seed or overseed; soil temperatures should consistently reach 50-55°F. Summers are warm (July averages 81.5°F); monitor for heat stress and water when soil is dry 2-3 inches down. With 83.9 days above 90°F annually, warm-season grasses recover faster from summer stress than cool-season types. Aerate and overseed cool-season lawns by early fall, well before October 17; this is the best renovation window. Cool winters (January averages 33.1°F) mean slow or dormant growth; keep debris off the lawn.
Watering Guidance
Low annual precipitation (23.0 inches) makes irrigation essential for maintaining green turf through summer. Currently, 100.0% of the county is in abnormally dry according to the US Drought Monitor. Standard warm-season watering of 1 inch per week is usually adequate during summer.
Regional Context
Clark County is close to the Kansas average temperature, it is somewhat drier than the state average, USDA zone 6b helps guide grass selection compared to neighboring counties.
Want detailed soil composition, drainage classes, and soil series data? View soil details on SoilByCounty.com
Frequently Asked Questions
What USDA hardiness zone is Clark County in?
What is the best grass for Clark County?
How much rainfall does Clark County get?
What is the soil pH in Clark County?
Data sourced from USDA SSURGO, NOAA Climate Normals (1991-2020), USDA Plant Hardiness Zone Map, and US Drought Monitor. Lawn difficulty scores and grass recommendations are estimates for informational purposes only.
Explore more data for Clark County