Lawn Care Guide for Bon Homme County
Bon Homme County, South Dakota
USDA SSURGO / PHZMData Story
About Lawn Care in Bon Homme County, South Dakota
Tougher Conditions in Bon Homme
Bon Homme County scores a 48.5 on lawn difficulty, making it more challenging than both the state and national averages. Homeowners in this Zone 5a area must work harder to maintain healthy turf compared to their neighbors.
High Precipitation Meets High Heat
At 26.2 inches, this county receives more rain than the state average of 22.8 inches, yet it still faces 26 extreme heat days. The high growing degree day count of 2,941 suggests a very active mowing season from spring through fall.
Slightly Alkaline Soil Texture
The soil pH of 7.09 is slightly above the ideal range, which can occasionally limit the availability of certain micronutrients. A balanced blend of 24.0% clay and 26.9% sand provides a decent structure, though sulfur amendments may help lower pH.
Severe Drought Challenges Growth
Over half the county is currently in severe drought, and the region suffered through 40 weeks of drought in the last year. These intense conditions require strict water management and potentially letting lawns go dormant to survive.
Longer Growing Season for Lawns
The frost-free window between May 1st and October 7th is generous for this region. Heat-tolerant cool-season blends are your best bet to survive the 26 days of 90-degree weather.
Lawn Difficulty Score
Top Grass Fit for Bon Homme County
Excellent match
Scotts EZ Seed Patch & Repair Sun & Shade
Scotts
Top cultivar score: 92/100
Estimated — county soil data incomplete.
Zone 5a vs Kentucky Bluegrass's 3–7 band.
Soil pH 7.08713202429711 vs Kentucky Bluegrass's 6–7 window.
Precipitation 26.24" + soil AWC vs Kentucky Bluegrass's 30–40" need.
Growing-degree-days + frost window vs a beginner-difficulty establishment.
EZ Seed is the duct tape of lawn care — it's not the most elegant solution, but it works, and it works every time. The combination of grass seed, mulch (ground wood fiber), and fertilizer in one product solves the three biggest reasons bare spot repairs fail: poor seed-to-soil contact, seeds drying out, and no starter…
In Bon Homme County, USDA zone 5a, soil pH 7.1, Scotts EZ Seed Patch & Repair Sun & Shade scores 92/100 — a strong zone match, adequate moisture, and a long enough establishment window.
Why we ruled these out
- Scotts Turf Builder Bermudagrass — USDA zone 5a is below Scotts Turf Builder Bermudagrass's effective range (6–11); not recommended for this county.
See our fit-score methodology for how survivability is determined.
Recommended Grasses
Buffalograss
Bouteloua dactyloides
Blue Grama
Bouteloua gracilis
Tall Fescue
Festuca arundinacea
Best Grass Seed for Bon Homme County
Zone 5a • Cool-season grasses thrive here.
Find Seeds for Zone 5aClimate Snapshot
Annual Precip
26.2"
Growing Degree Days
2,941.4
Base 50F
Last Spring Frost
05/01
First Fall Frost
10/07
Days Above 95F
26
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
1.7"
inches of water
Monthly Water
5,140
gallons
Estimated Monthly Cost
$41.12
at $0.008/gallon average
Estimates based on 26" annual precipitation and estimated evapotranspiration. Actual costs vary by local water rates.
Common Lawn Problems in Bon Homme County
Persistent Drought Conditions
Bon Homme County experienced drought conditions for 40 of the past 52 weeks. Prioritize water-efficient grasses and consider reducing lawn area.
Learn more about regional lawn challenges at The Lawn Report.
Lawn Care Advisory: Bon Homme County
Lawn Verdict
Bon Homme County sits in USDA hardiness zone 5a, a transitional zone where cool-season grasses dominate but some warm-season varieties can survive. with winter lows reaching around -20.0°F. and 2,941.4 growing degree days, sufficient for most common turfgrasses. Moderate rainfall (26.2 inches) generally supports healthy lawns with minimal supplemental watering.
Seasonal Breakdown
Wait until after May 1 to seed or overseed; soil temperatures should consistently reach 50-55°F. Cool summers (July averages 74.4°F) reduce heat stress — maintain regular mowing and moderate watering. Aerate and overseed cool-season lawns by early fall, well before October 7; this is the best renovation window. Winters are harsh (January averages 18.8°F); avoid foot traffic on frozen turf and plan snow mold prevention.
Watering Guidance
Moderate rainfall (26.2 inches) means lawns benefit from weekly deep watering during summer stress. Currently, 100.0% of the county is in moderate drought according to the US Drought Monitor. Consider reducing irrigation frequency and allowing cool-season lawns to go semi-dormant during peak heat. Cool summers reduce water demand; overwatering is a bigger risk than drought stress.
Regional Context
Bon Homme County is close to the South Dakota average temperature, it is somewhat wetter than the state average, USDA zone 5a helps guide grass selection compared to neighboring counties.
Want detailed soil composition, drainage classes, and soil series data? View soil details on SoilByCounty.com
Frequently Asked Questions
What USDA hardiness zone is Bon Homme County in?
What is the best grass for Bon Homme County?
How much rainfall does Bon Homme County get?
What is the soil pH in Bon Homme County?
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.
Explore more data for Bon Homme County