Lawn Care Guide for Dewey County
Dewey County, South Dakota
Data Story
About Lawn Care in Dewey County, South Dakota
Average Difficulty in Dewey County
Dewey County’s lawn score of 53.4 is slightly better than the national average and the state average of 51.1. Residents in this Zone 4b region enjoy a moderate climate that balances growth with maintenance needs.
Dry Climate Requires Careful Watering
Annual precipitation is low at just 19.3 inches, requiring significant supplemental watering to keep lawns green. The 24 extreme heat days match the state average, so expect your mowing schedule to slow down during mid-summer dormancy.
Clay-Rich Soil for Nutrient Retention
The soil has a relatively high clay content of 30.3% and a pH of 7.18. While specific drainage data is missing, this high clay percentage means the soil will hold onto fertilizers well but may be prone to compaction.
Currently Clear of Drought
Dewey County is currently 100% free of drought conditions, a significant relief after 12 weeks of drought in the past year. Use this period of adequate moisture to establish new sod or perform heavy lawn repairs.
Preparing for a Short Season
Because the first fall frost arrives early on September 30, early spring planting is essential. Start your grass after the May 10 frost to maximize the growing season and establish a strong root system.
Lawn Difficulty Score
Recommended Grasses
Blue Grama
Bouteloua gracilis
Tall Fescue
Festuca arundinacea
Buffalograss
Bouteloua dactyloides
Climate Snapshot
Annual Precip
19.3"
Growing Degree Days
2,618.6
Base 50F
Last Spring Frost
05/10
First Fall Frost
09/30
Days Above 95F
24
Hardiness Zone
4b
Seeding Calendar — Zone 4B
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
2.2"
inches of water
Monthly Water
6,798
gallons
Estimated Monthly Cost
$54.39
at $0.008/gallon average
Estimates based on 19" annual precipitation and estimated evapotranspiration. Actual costs vary by local water rates.
Common Lawn Problems in Dewey County
Drought Stress
With only 19 inches of annual rainfall, lawns in Dewey County face significant drought stress. Consider drought-tolerant grass species and deep, infrequent watering.
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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