Lawn Care Guide for Sherman County
Sherman County, Oregon
Data Story
About Lawn Care in Sherman County, Oregon
Surprising Success in Sherman
Sherman County outperforms the state average with a lawn difficulty score of 49.4, nearly reaching the national median. This Zone 7a area manages to stay competitive despite significantly lower rainfall than its neighbors.
Navigating a Dry Climate
With only 11.8 inches of annual rain, natural precipitation falls well below the 30-50 inches grass prefers. Lawns here must withstand 25 extreme heat days and a relatively short 2,151 growing degree day season.
Prime Soil for Turf
The county boasts a near-perfect soil pH of 6.47, which sits right in the ideal 6.0-7.0 range. A balanced texture of 31.1% sand helps with drainage, reducing the need for intensive soil prep work.
Constant Water Management
The entire county is currently abnormally dry, following 25 weeks of drought in the past year. Since rainfall is scarce, investing in a high-efficiency sprinkler system is vital for lawn survival.
Choosing Rugged Grasses
Buffalograss or Tall Fescue are excellent choices for the dry, Zone 7a conditions found here. Wait until the threat of frost passes on May 15 to begin your seeding or sodding projects.
Lawn Difficulty Score
Recommended Grasses
Bermudagrass
Cynodon dactylon
Tall Fescue
Festuca arundinacea
Climate Snapshot
Annual Precip
11.8"
Growing Degree Days
2,151.4
Base 50F
Last Spring Frost
05/15
First Fall Frost
10/11
Days Above 95F
25
Hardiness Zone
7a
Seeding Calendar — Zone 7A
Seasonal Lawn Care Checklist
Spring
- Apply pre-emergent herbicide when soil reaches 55F
- Begin mowing when grass reaches 3 inches
- 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
- Overseed warm-season lawns if thinning
- Apply fall fertilizer (highest N application for cool-season)
- Continue mowing until growth stops
- Rake or mulch leaves to prevent smothering
Winter
- Apply pre-emergent for winter weeds
- Service mower and sharpen blades
- Plan spring soil amendments based on fall test
- Keep lawn clear of debris
Watering Deficit Calculator
Monthly Deficit
2.7"
inches of water
Monthly Water
8,390
gallons
Estimated Monthly Cost
$67.12
at $0.008/gallon average
Estimates based on 12" annual precipitation and estimated evapotranspiration. Actual costs vary by local water rates.
Common Lawn Problems in Sherman County
Drought Stress
With only 12 inches of annual rainfall, lawns in Sherman County face significant drought stress. Consider drought-tolerant grass species and deep, infrequent watering.
Persistent Drought Conditions
Sherman County experienced drought conditions for 25 of the past 52 weeks. Prioritize water-efficient grasses and consider reducing lawn area.
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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