Lawn Care Guide for Poweshiek County
Poweshiek County, Iowa
Data Story
About Lawn Care in Poweshiek County, Iowa
Forgiving Growth in Poweshiek
Poweshiek County is a high performer with a 79.6 lawn difficulty score, exceeding the Iowa state average. Its Hardiness Zone 5b classification and generous rainfall make it one of the more forgiving places to grow a lawn in the Midwest.
Cooler Summers and High Precipitation
Lawns here benefit from 37.8 inches of annual precipitation, the highest in this group and well within the ideal range. With only 11 extreme heat days—fewer than the state average—the grass experiences less summer stress than in other parts of Iowa.
Excellent pH and Moisture Retention
The soil pH of 6.30 is nearly perfect for nutrient absorption, meaning you likely won't need much lime or sulfur. While specific drainage data is limited, the 24.9% clay content helps the soil retain the county’s ample 37.8 inches of annual rain.
Bouncing Back from Dry Spells
The county faced only 10 weeks of drought last year, though 89.5% of the area is currently seeing abnormally dry conditions. Given the low number of extreme heat days, lawns here recover quickly from dry spells if given a little supplemental water.
Ideal Timing for Cool-Season Grass
This climate is ideal for cool-season blends like Kentucky Bluegrass and Fine Fescue. Target the period between the May 3 spring frost and the October 6 fall frost for your planting and fertilizing schedule.
Lawn Difficulty Score
Recommended Grasses
Tall Fescue
Festuca arundinacea
Climate Snapshot
Annual Precip
37.8"
Growing Degree Days
2,803.3
Base 50F
Last Spring Frost
05/03
First Fall Frost
10/06
Days Above 95F
11
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
0.6"
inches of water
Monthly Water
1,979
gallons
Estimated Monthly Cost
$15.83
at $0.008/gallon average
Estimates based on 38" 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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