Lawn Care Guide for Westmoreland County
Westmoreland County, Pennsylvania
USDA SSURGO / PHZMThis week in Westmoreland County · next up in about 3 weeks (Aug 21)
Get ready to seed cool-season grass — the best fall window is about to open.
Data Story
About Lawn Care in Westmoreland County, Pennsylvania
Above-Average Lawn Ease in Westmoreland
With a lawn difficulty score of 68.2, Westmoreland County is significantly easier to maintain than both the state average of 59.2 and the national median of 50.0. The county sits in USDA Hardiness Zone 6b, providing a stable environment for a variety of cool-season grasses.
Ideal Rainfall Meets Manageable Heat
The county receives 45.7 inches of annual precipitation, which fits perfectly within the ideal range for healthy turf. With only 9 extreme heat days compared to the state average of 11, Westmoreland lawns suffer less mid-summer stress and burning.
Acidic Silty Clay Needs Lime
The local soil is a well-drained silty clay loam, but its pH of 5.29 is quite acidic for turfgrass. Most lawns require lime applications to reach the ideal 6.0-7.0 pH range required for optimal nutrient absorption.
Strong Resilience Despite Dry Spells
Westmoreland shows high drought resilience, spending only 5 weeks in drought conditions over the past year. While nearly 40% of the area currently shows abnormal dryness, the well-drained soil structure helps roots stay healthy with minimal supplemental watering.
Prime Planting for Zone 6b
Kentucky Bluegrass and Tall Fescue are top choices for this climate. Aim to seed or sod after the last spring frost on April 30th to ensure the lawn establishes itself before the first fall frost arrives in mid-October.
Lawn Difficulty Score
Soil Summary
pH
5.3
Texture
Silty clay loam
Drainage
Well drained
Organic Matter
22.3%
Top Grass Fit for Westmoreland County
Excellent match
Jonathan Green Black Beauty Ultra
Jonathan Green
Top cultivar score: 92/100
Zone 6b vs Tall Fescue's 3–8 band.
Soil pH 5.28884902457955 vs Tall Fescue's 5.5–6.5 window.
Precipitation 45.73" + soil AWC vs Tall Fescue's 20–30" need.
Growing-degree-days + frost window vs a intermediate-difficulty establishment.
If you spend any time on lawn care forums, Reddit's r/lawncare, or YouTube lawn channels, one name comes up more than any other: Jonathan Green Black Beauty Ultra. It's practically a cult favorite, and the label, cultivar story, and long-running owner reports explain why. The secret is in the genetics.
In Westmoreland County, USDA zone 6b, soil pH 5.3, silty clay loam, Jonathan Green Black Beauty Ultra scores 92/100 — a strong zone match, adequate moisture, and a long enough establishment window.
Recommended Grasses
Tall Fescue
Festuca arundinacea
Choosing grass in Westmoreland County
Acidic soil (pH 5.3) is the main thing shaping grass choice in Westmoreland County. Here's how to work with it — then the specific pick.
- Amending your soil before you seedLime, timing, and the acid-tolerant shortlist.
- Tall Fescue, explainedTraits, care, and where Tall Fescue wins — the species behind your top match.
Top match for Westmoreland 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
45.7"
Growing Degree Days
2,865.143
Base 50F
Last Spring Frost
04/30
First Fall Frost
10/17
Days Above 95F
9
Hardiness Zone
6b
Seeding Calendar — Westmoreland County
Personalized to this county’s frost dates — a 170-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 6B.
Plan your seeding — Westmoreland County
Pick a grass and a goal to get a personalized schedule anchored to this county’s frost dates.
- 1Prepare the seedbedAug 7 – Aug 20
Mow low, dethatch or rake, and loosen the top ½ inch of soil so seed makes good contact.
- 2Sow seedAug 21 – Sep 18
Best window to sow Kentucky Bluegrass in Westmoreland County, anchored to your local frost dates.
- 3EstablishSep 19 – Oct 16
Protect young seedlings: mow only after they reach ~3 inches and hold off on weed pre-emergents until established.
Organic (muck/peat) soil holds moisture — a single ¼-inch watering most days is usually enough; let the surface dry slightly between cycles to prevent algae and damping-off.
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
0.0"
inches of water
Monthly Water
0
gallons
Estimated Monthly Cost
$0.00
at $0.008/gallon average
Estimates based on 46" annual precipitation and estimated evapotranspiration. Actual costs vary by local water rates.
Common Lawn Problems in Westmoreland County
Acidic Soil
Soil pH of 5.3 is below the ideal range for most grasses (6.0-7.0). Apply agricultural lime to raise pH gradually.
Learn more about regional lawn challenges at The Lawn Report.
Lawn Care Advisory: Westmoreland County
Lawn Verdict
Westmoreland County sits in USDA hardiness zone 6b, a transitional zone where cool-season grasses dominate but some warm-season varieties can survive. with winter lows reaching around -5.0°F. and 2,865.143 growing degree days, sufficient for most common turfgrasses. Moderate rainfall (45.7 inches) generally supports healthy lawns with minimal supplemental watering.
Seasonal Breakdown
Wait until after April 30 to seed or overseed; soil temperatures should consistently reach 50-55°F. Cool summers (July averages 71.4°F) reduce heat stress — maintain regular mowing and moderate watering. Aerate and overseed cool-season lawns by early fall, well before October 17; this is the best renovation window. Cool winters (January averages 28.2°F) mean slow or dormant growth; keep debris off the lawn.
Watering Guidance
With 45.7 inches of annual rainfall, established lawns typically need watering only during extended dry spells. Currently, 39.5% 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
Westmoreland County is close to the Pennsylvania average temperature, USDA zone 6b helps guide grass selection compared to neighboring counties.
Dig deeper into Westmoreland County
Westmoreland County is a USDA Zone 6B, organic-soil, cool-season county. Explore the data that shapes its lawn:
Want detailed soil composition, drainage classes, and soil series data? View soil details on SoilByCounty.com
Frequently Asked Questions
What USDA hardiness zone is Westmoreland County in?
What is the best grass for Westmoreland County?
How long is the growing season in Westmoreland County?
How much rainfall does Westmoreland County get?
What is the soil pH in Westmoreland County?
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 Westmoreland County