Lawn Care Guide for Yakima County
Yakima County, Washington
USDA SSURGO / PHZMThis week in Yakima County · next up in about 2 weeks (Aug 14)
Get ready to seed cool-season grass — the best fall window is about to open.
Data Story
About Lawn Care in Yakima County, Washington
Arid Conditions Challenge Yakima Growers
Yakima County presents a difficult landscape for lawn enthusiasts with a score of 28.4. This score is well below the national median and the state average, largely due to the arid conditions found in Zone 7a.
Washington's Striking Desert Climate
With a mere 8.1 inches of rain per year, Yakima is the driest county in this group and falls far short of the 30-inch minimum for healthy grass. Lawns must endure 39 days of extreme heat, requiring dedicated irrigation systems for survival.
Preparing for Alkaline Soil Conditions
While specific soil data is unavailable, the region’s volcanic and desert history often results in alkaline or sandy soils. Regular applications of organic matter and sulfur may be necessary to lower pH and improve water retention for thirsty grass.
A Full Year of Constant Drought
The county has spent every single week of the past year in drought, and 100% of the area remains abnormally dry. Water conservation is a necessity here, requiring growers to use every drop efficiently to maintain any green space.
Drought-Resistant Turf for the High Desert
Drought-resistant varieties like Buffalograss or hybrid fescues are the smartest choices for this challenging climate. Plan your seeding between the May 4 and October 10 frost dates, focusing on early fall for the most resilient results.
Lawn Difficulty Score
Top Grass Fit for Yakima 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 Yakima County.
Recommended Grasses
Bermudagrass
Cynodon dactylon
Buffalograss
Bouteloua dactyloides
Blue Grama
Bouteloua gracilis
Tall Fescue
Festuca arundinacea
Choosing grass in Yakima County
Severe drought (53 wk in drought / yr) and cold winters (lows near 0°F) are the two things working hardest against a lawn in Yakima County. Here's how to choose for both — then the specific pick.
- Drought-tolerant grass seedWhat survives where water is scarce and often restricted.
- Cold-hardy hybrid bluegrassA transition-zone option built to shrug off winterkill.
- Tall Fescue, explainedTraits, care, and where Tall Fescue wins — the species behind your top match.
Top match for Yakima County: Tall Fescue
See the full breakdownPremium Grass Seeds is a sister site in our network. We may earn a commission from qualifying purchases made through its retailer links — this never affects your price. Guidance here reflects your county’s climate and soil data, not hands-on testing.
Climate Snapshot
Annual Precip
8.1"
Growing Degree Days
2,659.9
Base 50F
Last Spring Frost
05/04
First Fall Frost
10/10
Days Above 95F
39
Hardiness Zone
7a
Seeding Calendar — Yakima County
Personalized to this county’s frost dates — a 159-day growing season. Windows below are computed from local last-spring and first-fall frost normals, so they differ county-to-county even within USDA Zone 7A.
Plan your seeding — Yakima County
Pick a grass and a goal to get a personalized schedule anchored to this county’s frost dates.
- 1Prepare the seedbedMay 3 – May 16
Mow low, dethatch or rake, and loosen the top ½ inch of soil so seed makes good contact.
- 2Sow seedMay 17 – Jun 14
Best window to sow Bermudagrass in Yakima County, anchored to your local frost dates.
- 3EstablishJun 15 – Jul 12
Protect young seedlings: mow only after they reach ~3 inches and hold off on weed pre-emergents until established.
Keep the seedbed consistently moist — roughly ¼ inch of water daily, split into shorter cycles if the surface dries out quickly. County-specific soil texture isn’t available here, so adjust to how fast your own soil drains.
You’re in the transition zone — both cool- and warm-season grasses can work; the schedule above follows the species you selected.
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
3.1"
inches of water
Monthly Water
9,678
gallons
Estimated Monthly Cost
$77.42
at $0.008/gallon average
Estimates based on 8" annual precipitation and estimated evapotranspiration. Actual costs vary by local water rates.
Common Lawn Problems in Yakima County
Drought Stress
With only 8 inches of annual rainfall, lawns in Yakima County face significant drought stress. Consider drought-tolerant grass species and deep, infrequent watering.
Persistent Drought Conditions
Yakima 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.
Lawn Care Advisory: Yakima County
Lawn Verdict
Yakima County falls in USDA hardiness zone 7a, a favorable range for both cool- and warm-season grasses. with winter lows reaching around 0.0°F. and 2,659.9 growing degree days, sufficient for most common turfgrasses. Low rainfall (8.1 inches) means supplemental irrigation is essential during summer months.
Seasonal Breakdown
Wait until after May 4 to seed or overseed; soil temperatures should consistently reach 50-55°F. Cool summers (July averages 72.4°F) reduce heat stress — maintain regular mowing and moderate watering. With 38.883333333333326 days above 90°F annually, warm-season grasses recover faster from summer stress than cool-season types. Aerate and overseed cool-season lawns by early fall, well before October 10; this is the best renovation window. Cool winters (January averages 31.3°F) mean slow or dormant growth; keep debris off the lawn.
Watering Guidance
Low annual precipitation (8.1 inches) makes irrigation essential for maintaining green turf through summer. Currently, 100.0% 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
Yakima County is close to the Washington average temperature, it is significantly drier than the state average (30.5 inches less), the growing season is noticeably longer than the state average, USDA zone 7a 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 Yakima County in?
What is the best grass for Yakima County?
How long is the growing season in Yakima County?
How much rainfall does Yakima 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 Yakima County