Lawn Care Guide for Iron County
Iron County, Wisconsin
Data Story
About Lawn Care in Iron County, Wisconsin
Cold Winters Challenge Iron County Grass
Iron County scores 56.5 for lawn difficulty, making it harder to maintain than the state average of 64.4. Situated in USDA Hardiness Zone 4a, this region faces shorter, colder growing seasons than most of Wisconsin.
Limited Heat for Slow Growth
With only 1,860 growing degree days and three extreme heat days, turf grows slowly here compared to warmer southern counties. However, the 37.3 inches of annual precipitation provides ample hydration for northern grass varieties.
Correcting Highly Acidic Soil
The soil pH is remarkably low at 4.38, meaning most lawns will struggle without significant lime applications to reach the 6.0-7.0 ideal range. The soil is well-drained with low clay content of 5.5%, allowing nutrients to wash away quickly.
Resilience During Shorter Dry Spells
Iron County faced 14 weeks of drought last year, and 60.1% of the county currently remains abnormally dry. Because the soil is well-drained, lawns may require more frequent, light watering during these periods to prevent dormancy.
Planning for a Short Summer
Select cold-hardy Fine Fescue or Perennial Ryegrass to survive the harsh 4a winters. Planting should occur between the late spring frost on May 24 and the early fall frost on October 1.
Lawn Difficulty Score
Recommended Grasses
Tall Fescue
Festuca arundinacea
Climate Snapshot
Annual Precip
37.3"
Growing Degree Days
1,860.45
Base 50F
Last Spring Frost
05/24
First Fall Frost
10/01
Days Above 95F
3
Hardiness Zone
4a
Seeding Calendar — Zone 4A
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
0.5"
inches of water
Monthly Water
1,567
gallons
Estimated Monthly Cost
$12.54
at $0.008/gallon average
Estimates based on 37" annual precipitation and estimated evapotranspiration. Actual costs vary by local water rates.
Common Lawn Problems in Iron County
Acidic Soil
Soil pH of 4.4 is below the ideal range for most grasses (6.0-7.0). Apply agricultural lime to raise pH gradually.
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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