Lawn Care Guide for Henry County
Henry County, Illinois
Data Story
About Lawn Care in Henry County, Illinois
A Northern Success Story
Henry County earns a strong lawn difficulty score of 76.7, placing it well above the national median of 50.0. This Hardiness Zone 5b area favors cool-season grasses that can withstand the colder winters of northern Illinois.
Cool Nights and Comfortable Days
With only 16 extreme heat days and 38.7 inches of rain, the climate is very gentle on cool-season turf. The 3222 growing degree days mean your mowing schedule is predictable and manageable throughout the peak season.
Balanced Texture and Steady pH
The soil pH of 6.29 is within the healthy range, while the 20.5% sand content is higher than many neighbors, likely aiding in natural drainage. You can maintain this foundation with simple annual fertilization and regular mowing at the proper height.
Resilience During Dry Stretches
The county has faced 23 weeks of drought in the past year, but severe drought currently impacts only 2.2% of the area. This stability allows you to focus on routine care rather than emergency watering for most of the summer.
Timing the Frost Window
Wait for the ground to warm after the April 24 frost before starting your spring projects. Because the first fall frost arrives on October 17, late August is the prime time for overseeding to ensure the grass matures before the cold sets in.
Lawn Difficulty Score
Recommended Grasses
Tall Fescue
Festuca arundinacea
Climate Snapshot
Annual Precip
38.7"
Growing Degree Days
3,221.967
Base 50F
Last Spring Frost
04/24
First Fall Frost
10/17
Days Above 95F
16
Hardiness Zone
5b
Seeding Calendar — Zone 5B
Seasonal Lawn Care Checklist
Spring
- Apply pre-emergent herbicide when soil reaches 55F
- Overseed bare spots once frost risk passes
- 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
- Core aerate compacted areas
- Apply fall fertilizer (highest N application for cool-season)
- Continue mowing until growth stops
- Rake or mulch leaves to prevent smothering
Winter
- Avoid walking on frozen turf
- Service mower and sharpen blades
- Plan spring soil amendments based on fall test
- Keep lawn clear of debris
Watering Deficit Calculator
Monthly Deficit
0.6"
inches of water
Monthly Water
1,885
gallons
Estimated Monthly Cost
$15.08
at $0.008/gallon average
Estimates based on 39" annual precipitation and estimated evapotranspiration. Actual costs vary by local water rates.
Common Lawn Problems in Henry County
Persistent Drought Conditions
Henry County experienced drought conditions for 23 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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