Lawn Care Guide for Clark County
Clark County, Washington
Data Story
About Lawn Care in Clark County, Washington
Clark County Leads in Lawn Ease
Clark County is a standout with a lawn difficulty score of 52.9, which is easier than both the state and national averages. Located in Zone 8b, the climate is highly favorable for maintaining lush turf with minimal stress. This makes it the most user-friendly county for lawn enthusiasts in this regional comparison.
Ideal Rainfall and Moderate Heat
The county receives 44 inches of rain annually, falling right in the 30-50 inch 'ideal' range for lawn health. While there are 12 extreme heat days, the overall climate is temperate with 2,109 growing degree days. This balance allows for consistent growth without the constant threat of scorching temperatures.
Acidic Soil Requires Attention
Clark County's soil pH is quite acidic at 5.43, well below the ideal range of 6.0-7.0. The cobbly silt loam is well-drained but will likely require lime applications to neutralize acidity and unlock nutrients. Its 18.1% clay content helps with nutrient retention but requires monitoring to prevent compaction.
Navigating Occasional Dry Stretches
Despite its high score, 82.9% of Clark County is currently abnormally dry. The county saw 29 weeks of drought over the past year, reminding homeowners that summer irrigation is still necessary. Focus on maintaining a taller grass height during these dry weeks to shade the soil and retain moisture.
Optimal Growth in Zone 8b
With a frost-free window from April 26 to October 18, you have a solid season for establishing new turf. Zone 8b is ideal for Perennial Ryegrass and Tall Fescue blends that can handle both the wet winters and dry summers. Late summer is the prime time to overseed for a thick, resilient lawn.
Lawn Difficulty Score
Soil Summary
pH
5.4
Texture
Cobbly silt loam
Drainage
Well drained
Organic Matter
4.9%
Recommended Grasses
Bermudagrass
Cynodon dactylon
Climate Snapshot
Annual Precip
44.0"
Growing Degree Days
2,109.233
Base 50F
Last Spring Frost
04/26
First Fall Frost
10/18
Days Above 95F
12
Hardiness Zone
8b
Seeding Calendar — Zone 8B
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
- Raise mowing height to reduce heat stress
- 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
- Overseed with ryegrass for winter color
Watering Deficit Calculator
Monthly Deficit
0.0"
inches of water
Monthly Water
0
gallons
Estimated Monthly Cost
$0.00
at $0.008/gallon average
Estimates based on 44" annual precipitation and estimated evapotranspiration. Actual costs vary by local water rates.
Common Lawn Problems in Clark County
Acidic Soil
Soil pH of 5.4 is below the ideal range for most grasses (6.0-7.0). Apply agricultural lime to raise pH gradually.
Persistent Drought Conditions
Clark County experienced drought conditions for 29 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 Clark County