Lawn Care Guide for Clearwater County
Clearwater County, Idaho
Data Story
About Lawn Care in Clearwater County, Idaho
A More Manageable Climate in Clearwater
Clearwater County earns a lawn difficulty score of 44.2, making it much easier to maintain turf here than in other parts of Idaho. This score sits comfortably above the state average of 33.3 and approaches the national median. The county benefits from being in Hardiness Zone 7a, which allows for a wider variety of plant life.
Exceptional Rainfall Fuels Green Growth
With 37.3 inches of annual precipitation, Clearwater County hits the sweet spot for the 30-50 inches required by ideal lawns. The climate is relatively mild with only 22 extreme heat days and 1668 growing degree days. This natural moisture significantly reduces the need for supplemental irrigation compared to neighboring counties.
Identifying Your Soil Composition
While comprehensive soil data is not available for this region, the high rainfall suggests a potential for more organic matter than Idaho's more arid zones. Homeowners are encouraged to test their soil pH to ensure it falls within the 6.0-7.0 range for optimal grass health. Proper drainage remains important to prevent root rot during wet spring months.
Managing Pockets of Severe Dryness
Despite high annual rainfall, 38.4% of the county is currently experiencing severe drought, and the region has faced 53 weeks of dry conditions over the last year. It is important to monitor local water restrictions even when the season feels wet. Mulching around lawn edges can help retain the moisture provided by Clearwater's natural precipitation.
Seizing the 7a Growing Season
The Zone 7a climate supports resilient grasses like Tall Fescue or Kentucky Bluegrass blends. Aim to start your lawn after the last spring frost on June 3rd for the best results. The extended fall season, with frosts not arriving until October 20th, provides a generous window for lawn establishment.
Lawn Difficulty Score
Recommended Grasses
Tall Fescue
Festuca arundinacea
Bermudagrass
Cynodon dactylon
Climate Snapshot
Annual Precip
37.3"
Growing Degree Days
1,668.375
Base 50F
Last Spring Frost
06/03
First Fall Frost
10/20
Days Above 95F
22
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
0.5"
inches of water
Monthly Water
1,487
gallons
Estimated Monthly Cost
$11.89
at $0.008/gallon average
Estimates based on 37" annual precipitation and estimated evapotranspiration. Actual costs vary by local water rates.
Common Lawn Problems in Clearwater County
Persistent Drought Conditions
Clearwater County experienced drought conditions for 53 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.
Explore more data for Clearwater County