Lawn Care Guide for Jefferson County
Jefferson County, Wisconsin
Data Story
About Lawn Care in Jefferson County, Wisconsin
Jefferson Leads in Lawn Ease
Jefferson County boasts a high lawn difficulty score of 81.2, far outpacing the Wisconsin average of 64.4. This Zone 5b county offers some of the most hospitable conditions for residential turf in the state.
Extended Growth and Summer Heat
A robust 2,685 growing degree days and 10 extreme heat days create a long, active season for mowing. The 37.2 inches of annual precipitation is well-distributed, keeping grass hydrated during the warmer July peaks.
Prime Sandy Loam Foundations
The soil pH of 6.32 is nearly perfect for lawn health, and the sandy loam texture provides a professional-grade growing medium. Lawns benefit from well-drained conditions and a balanced 14.4% clay content that retains essential nutrients.
Consistent Moisture and Low Stress
The county only saw four weeks of drought in the past year and currently reports no abnormally dry areas. This consistency allows homeowners to maintain lush green space with minimal supplemental irrigation.
Long Growing Windows in 5b
The generous growing season begins after the April 29 frost and extends until October 12. These dates allow ample time for seeding heat-tolerant Tall Fescue or traditional Bluegrass blends.
Lawn Difficulty Score
Recommended Grasses
Tall Fescue
Festuca arundinacea
Climate Snapshot
Annual Precip
37.2"
Growing Degree Days
2,685
Base 50F
Last Spring Frost
04/29
First Fall Frost
10/12
Days Above 95F
10
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
0.7"
inches of water
Monthly Water
2,046
gallons
Estimated Monthly Cost
$16.37
at $0.008/gallon average
Estimates based on 37" annual precipitation and estimated evapotranspiration. Actual costs vary by local water rates.
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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