Lawn Care Guide for Winnebago County
Winnebago County, Wisconsin
USDA SSURGO / PHZMData Story
About Lawn Care in Winnebago County, Wisconsin
Favorable conditions near the water
Winnebago County scores a 68.6 for lawn difficulty, outperforming the state average of 64.4. Its location in Hardiness Zone 5b provides a stable climate for a variety of lawn styles and grass types. Homeowners here typically find it easier to keep their yards green than the average American.
Slightly drier with steady heat
The county averages 31.9 inches of rain, which is lower than the Wisconsin state average of 34.5 inches. Despite being drier, the 2,630 growing degree days and 7 extreme heat days provide a very productive environment for turf. Grass starts growing quickly after the April 30 spring frost.
Well-drained silt loam foundation
The soil pH of 5.92 is just slightly below the ideal 6.0-7.0 range, requiring only minor adjustments for peak performance. Its well-drained silt loam texture, featuring 16.1% clay and 37.8% sand, provides an excellent balance for root health. This natural drainage reduces the risk of fungal diseases and waterlogging.
Currently facing dry conditions
The entire county is currently classified as abnormally dry, following 13 weeks of drought over the past year. Since annual rainfall is lower than the state average, supplemental watering is necessary to prevent browning during the summer. Use rain barrels or smart irrigation to manage water efficiently while keeping the lawn active.
Thriving in the 5b zone
Kentucky Bluegrass and Turf-Type Tall Fescue are the most recommended varieties for this region. You have a long growing window between April 30 and the first frost on October 20. Seeding in late August allows the grass to take advantage of cooler temperatures and autumn rains.
Lawn Difficulty Score
Top Grass Fit for Winnebago County
Excellent match
Jonathan Green Black Beauty Ultra
Jonathan Green
Top cultivar score: 100/100
Zone 5b vs Tall Fescue's 3–8 band.
Soil pH 5.92476932125246 vs Tall Fescue's 5.5–6.5 window.
Precipitation 31.924999999999997" + 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 Winnebago County, USDA zone 5b, soil pH 5.9, silt loam, Jonathan Green Black Beauty Ultra scores 100/100 — a strong zone match, adequate moisture, and a long enough establishment window.
Why we ruled these out
- Scotts Turf Builder Bermudagrass — USDA zone 5b is below Scotts Turf Builder Bermudagrass's effective range (6–11); not recommended for this county.
See our fit-score methodology for how survivability is determined.
Recommended Grasses
Tall Fescue
Festuca arundinacea
Best Grass Seed for Winnebago County
Zone 5b • Cool-season grasses thrive here.
Find Seeds for Zone 5bClimate Snapshot
Annual Precip
31.9"
Growing Degree Days
2,629.75
Base 50F
Last Spring Frost
04/30
First Fall Frost
10/20
Days Above 95F
7
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
1.1"
inches of water
Monthly Water
3,423
gallons
Estimated Monthly Cost
$27.39
at $0.008/gallon average
Estimates based on 32" annual precipitation and estimated evapotranspiration. Actual costs vary by local water rates.
Lawn Care Advisory: Winnebago County
Lawn Verdict
Winnebago County sits in USDA hardiness zone 5b, a transitional zone where cool-season grasses dominate but some warm-season varieties can survive. with winter lows reaching around -15.0°F. and 2,629.75 growing degree days, sufficient for most common turfgrasses. Moderate rainfall (31.9 inches) generally supports healthy lawns with minimal supplemental watering.
Seasonal Breakdown
Wait until after April 30 to seed or overseed; soil temperatures should consistently reach 50-55°F. Cool summers (July averages 71.8°F) reduce heat stress — maintain regular mowing and moderate watering. Aerate and overseed cool-season lawns by early fall, well before October 20; this is the best renovation window. Winters are harsh (January averages 18.3°F); avoid foot traffic on frozen turf and plan snow mold prevention.
Watering Guidance
Moderate rainfall (31.9 inches) means lawns benefit from weekly deep watering during summer stress. Currently, 100.0% of the county is in abnormally dry according to the US Drought Monitor. Cool summers reduce water demand; overwatering is a bigger risk than drought stress.
Regional Context
Winnebago County is close to the Wisconsin average temperature, USDA zone 5b 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 Winnebago County in?
What is the best grass for Winnebago County?
How much rainfall does Winnebago County get?
What is the soil pH in Winnebago 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 Winnebago County