Lawn Care Guide for Clallam County
Clallam County, Washington
USDA SSURGO / PHZMData Story
About Lawn Care in Clallam County, Washington
Coastal Comfort for Clallam Lawns
Clallam County boasts a lawn difficulty score of 40.8, making it one of the easier places in Washington to keep a yard green. Its Hardiness Zone 8b status and mild maritime climate provide a significant advantage over the state average of 36.9. You will find that nature does much of the heavy lifting here.
High Rainfall and Cool Summers
With a generous 58.7 inches of annual precipitation, Clallam County far exceeds the state average of 38.5 inches. Extreme heat is almost non-existent, with only 1 day per year reaching 90°F. The low 1,311 growing degree days mean grass grows slowly and steadily, requiring less frequent mowing than in warmer regions.
Managing High Moisture in Soil
Specific soil data for pH and texture is currently limited, but the 58.7 inches of rain suggests a need for excellent drainage. In this wet environment, moss can often outcompete grass if the soil becomes too compacted or acidic. Regular aeration and monitoring for drainage issues will keep your lawn healthy and fungus-free.
The Most Resilient County in the Set
Clallam County is relatively drought-resilient, with only 23.3% of the area currently classified as abnormally dry. It experienced just 28 weeks of drought in the past year, the lowest in this group. You can typically rely on natural rainfall for most of the year, though occasional summer watering may be needed.
A Long, Mild Growing Season
Your planting window opens after April 20 and stays favorable until the first frost on October 31. Zone 8b is perfect for cool-season grasses like Fine Fescue and Bentgrass that thrive in moist, temperate conditions. Start seeding in early spring to take advantage of the gentle rise in temperatures.
Lawn Difficulty Score
Top Grass Fit for Clallam County
Cool-season grasses are the general fit here
County soil and zone data are incomplete, so we show a category recommendation rather than a precise cultivar score for Clallam County.
Recommended Grasses
Tall Fescue
Festuca arundinacea
Bermudagrass
Cynodon dactylon
Best Grass Seed for Clallam County
Zone 8b • Cool- and warm-season grasses thrive here.
Find Seeds for Zone 8bClimate Snapshot
Annual Precip
58.7"
Growing Degree Days
1,311.133
Base 50F
Last Spring Frost
04/20
First Fall Frost
10/31
Days Above 95F
1
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 59" annual precipitation and estimated evapotranspiration. Actual costs vary by local water rates.
Common Lawn Problems in Clallam County
Excess Moisture & Fungal Disease
High annual rainfall (59 inches) increases risk of fungal diseases like brown patch and dollar spot. Ensure good drainage and avoid overwatering.
Persistent Drought Conditions
Clallam County experienced drought conditions for 28 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: Clallam County
Lawn Verdict
Clallam County falls in USDA hardiness zone 8b, a favorable range for both cool- and warm-season grasses. with winter lows reaching around 15.0°F. with just 1,311.133 growing degree days, limiting options to very cold-hardy grasses. Mild year-round temperatures create a relatively low-stress environment for turf. High annual precipitation (58.7 inches) supports lush growth but increases disease pressure.
Seasonal Breakdown
Wait until after April 20 to seed or overseed; soil temperatures should consistently reach 50-55°F. Cool summers (July averages 60.8°F) reduce heat stress — maintain regular mowing and moderate watering. Aerate and overseed cool-season lawns by early fall, well before October 31; this is the best renovation window. Cool winters (January averages 39.7°F) mean slow or dormant growth; keep debris off the lawn.
Watering Guidance
Clallam County receives abundant rainfall (58.7 inches annually), so lawns rarely need supplemental irrigation. Currently, 23.3% of the county is in abnormally dry according to the US Drought Monitor. Cool summers reduce water demand; overwatering is a bigger risk than drought stress.
Regional Context
Clallam County is close to the Washington average temperature, it is significantly wetter than the state average (20.1 inches more), the growing season is noticeably shorter than the state average, USDA zone 8b 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 Clallam County in?
What is the best grass for Clallam County?
How much rainfall does Clallam County get?
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 Clallam County