Lawn Care Guide for Hennepin County
Hennepin County, Minnesota
Data Story
About Lawn Care in Hennepin County, Minnesota
High Success Rates in Hennepin
Hennepin County boasts a lawn difficulty score of 75.7, indicating a relatively easy maintenance environment compared to the state average of 63.9. Now classified in USDA Zone 5a, the county supports a wider variety of grass types than its northern neighbors. This favorable score reflects a climate that is generally conducive to lush, green suburban landscapes.
Warm Summers Drive Growth Cycles
The county generates 2,833 growing degree days, fueled by a July average of 73.5°F and 13 extreme heat days. This extra warmth accelerates grass growth, leading to more frequent mowing than in cooler parts of the state. While 32.4 inches of rain provides a solid base, those 13 hot days require careful monitoring to prevent heat stress.
Sandy Soil Requires Nutrient Management
The soil is notably sandy at 54.0%, which ensures excellent drainage but requires more frequent fertilization to keep nutrients in the root zone. A pH of 6.12 sits perfectly within the ideal range, ensuring that your grass can easily access the minerals it needs. Despite the high sand content, the 13.8% clay provides just enough structure to hold some moisture between waterings.
Exceptional Moisture Stability This Year
Hennepin County recorded zero weeks in drought over the past year, showcasing remarkable resilience compared to other Minnesota regions. Because current dry conditions are at 0.0%, lawns are entering the peak season with full moisture reserves. Maintaining this health is simple: water deeply in the early morning to combat those 13 annual high-heat days.
Long Growing Window for Metro Lawns
The growing season kicks off after the last spring frost on April 23 and stretches until October 14. This provides a generous window for seeding Kentucky Bluegrass or Fine Fescues, which thrive in Zone 5a. Late summer remains the golden window for repair, allowing new grass to establish before the first autumn frost.
Lawn Difficulty Score
Recommended Grasses
Tall Fescue
Festuca arundinacea
Climate Snapshot
Annual Precip
32.4"
Growing Degree Days
2,832.62
Base 50F
Last Spring Frost
04/23
First Fall Frost
10/14
Days Above 95F
13
Hardiness Zone
5a
Seeding Calendar — Zone 5A
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
3,455
gallons
Estimated Monthly Cost
$27.64
at $0.008/gallon average
Estimates based on 32" 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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