Lawn Care Guide for Marshall County
Marshall County, Iowa
Data Story
About Lawn Care in Marshall County, Iowa
High Ease of Growth in Marshall
Marshall County earns a stellar 82.2 lawn difficulty score, making it easier to grow grass here than in most of the state. Its Zone 5a climate is ideal for cool-season turfs that prefer moderate temperatures over intense heat.
Cooler Summers, Steady Growth
The county only averages 13 extreme heat days, significantly lower than the state average of 16. Combined with 35.9 inches of rain, this cooler profile helps lawns stay green longer into the summer months.
Reliable Moderately Drained Loam
A 6.43 pH and moderately well-drained loam soil create a nearly perfect medium for grass. With 23.8% clay and 26.0% sand, the soil offers both the drainage needed for health and the density needed for nutrient storage.
Healthy Moisture Levels
The county spent only 6 weeks in drought over the last year and currently has only 2.9% of its area listed as abnormally dry. These statistics make Marshall County one of the most drought-resilient areas in the region.
Ideal Late-Spring Seeding
Start your lawn project after the April 30 frost to take advantage of the 2,908 growing degree days. Kentucky Bluegrass and Fine Fescue thrive in these moderately drained soils and benefit from the early October fall frost timeline.
Lawn Difficulty Score
Recommended Grasses
Tall Fescue
Festuca arundinacea
Climate Snapshot
Annual Precip
35.9"
Growing Degree Days
2,907.5
Base 50F
Last Spring Frost
04/30
First Fall Frost
10/07
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
0.8"
inches of water
Monthly Water
2,482
gallons
Estimated Monthly Cost
$19.85
at $0.008/gallon average
Estimates based on 36" 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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