Lawn Care Guide for Clark County
Clark County, Illinois
Data Story
About Lawn Care in Clark County, Illinois
Navigating Clark County's Transition Zone
Clark County has a lawn difficulty score of 65.2, making it more challenging than the Illinois average of 69.8. Situated in Hardiness Zone 6b, the slightly warmer winters and hotter summers require more attentive care. Despite these challenges, it remains well above the national median for lawn success.
Abundant Rain but High Heat Stress
The county receives 45.5 inches of annual precipitation, which is significantly higher than the state average of 41.8 inches. However, 35 extreme heat days and 3,839 growing degree days can quickly dry out turf. Lawns here need a careful balance of this high rainfall and protection from intense summer sun.
Optimal pH and Balanced Texture
Soil pH sits at a healthy 6.47, creating an excellent environment for nutrient uptake. The texture is balanced with 19.0% clay and 20.6% sand, allowing for better drainage than many neighboring counties. This combination means less soil amendment is required compared to more clay-heavy areas.
Partial Relief from Severe Drought
While 100% of the county is abnormally dry, 81.4% currently faces severe drought conditions. The county has endured 31 weeks of drought in the past year, making water-efficient landscaping a wise choice. Using drought-tolerant grass seed can help your lawn survive these frequent dry spells.
Seeding for the 6b Climate
Tall Fescue is highly recommended for Zone 6b because it handles the 35 extreme heat days better than other varieties. Plan your spring planting after April 14 or start your fall renovation before the October 20 frost. Early autumn is generally the most successful time for establishment in this climate.
Lawn Difficulty Score
Recommended Grasses
Tall Fescue
Festuca arundinacea
Climate Snapshot
Annual Precip
45.5"
Growing Degree Days
3,838.6
Base 50F
Last Spring Frost
04/14
First Fall Frost
10/20
Days Above 95F
35
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
0.1"
inches of water
Monthly Water
339
gallons
Estimated Monthly Cost
$2.71
at $0.008/gallon average
Estimates based on 46" annual precipitation and estimated evapotranspiration. Actual costs vary by local water rates.
Common Lawn Problems in Clark County
Persistent Drought Conditions
Clark County experienced drought conditions for 31 of the past 52 weeks. Prioritize water-efficient grasses and consider reducing lawn area.
Learn more about regional lawn challenges at The Lawn Report.
Want detailed soil composition, drainage classes, and soil series data? View soil details on SoilByCounty.com
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.
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