Lawn Care Guide for Dallam County
Dallam County, Texas
USDA SSURGO / PHZMThis week in Dallam County · next up in about 4 weeks (Aug 24)
Get ready to seed cool-season grass — the best fall window is about to open.
Data Story
About Lawn Care in Dallam County, Texas
The Panhandle's Cold and Dry Challenge
Dallam County holds a lawn difficulty score of 38.6, outperforming the Texas state average despite its harsh northern climate. As part of Hardiness Zone 6b, it faces the coldest winters in the state, requiring different turf strategies.
Short Seasons and Scarce Rain
Annual precipitation is quite low at 16.6 inches, making irrigation a necessity for survival. The growing season is limited, with only 4,069 growing degree days and a relatively low 80 days of extreme heat.
Sandy Soil with High pH
The soil is 56.4% sand, which allows for fast drainage but poor nutrient retention. With a pH of 7.74, the soil is very alkaline, meaning growers must use acidifying fertilizers to prevent grass from turning yellow.
Managing Dryness in the North
Dallam County spent 13 weeks in drought this past year, and the entire county remains abnormally dry. To conserve water, residents should aerate the soil to ensure every drop of the limited 16.6 inches reaches the roots.
Seeding for a Cooler Climate
Unlike most of Texas, cool-season grasses like Tall Fescue may work here if irrigated, but planting must wait until after the April 28 frost. You have until October 20 to establish your lawn before the first autumn freeze hits.
Lawn Difficulty Score
Top Grass Fit for Dallam County
Excellent match
Jonathan Green Black Beauty Ultra
Jonathan Green
Top cultivar score: 82/100
Zone 6b vs Tall Fescue's 3–8 band.
Soil pH 7.73727210931565 vs Tall Fescue's 5.5–6.5 window.
Precipitation 16.6" + 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 Dallam County, USDA zone 6b, soil pH 7.7, Jonathan Green Black Beauty Ultra scores 82/100 — a strong zone match, adequate moisture, and a long enough establishment window.
Recommended Grasses
Buffalograss
Bouteloua dactyloides
Blue Grama
Bouteloua gracilis
Tall Fescue
Festuca arundinacea
Choosing grass in Dallam County
Severe drought (13 wk in drought / yr) is the main thing shaping grass choice in Dallam County. Here's how to work with it — then the specific pick.
- Drought-tolerant grass seedWhat survives where water is scarce and often restricted.
- Tall Fescue, explainedTraits, care, and where Tall Fescue wins — the species behind your top match.
Top match for Dallam 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
16.6"
Growing Degree Days
4,068.7
Base 50F
Last Spring Frost
04/28
First Fall Frost
10/20
Days Above 95F
80
Hardiness Zone
6b
Seeding Calendar — Dallam County
Personalized to this county’s frost dates — a 175-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 — Dallam County
Pick a grass and a goal to get a personalized schedule anchored to this county’s frost dates.
- 1Prepare the seedbedApr 27 – May 10
Mow low, dethatch or rake, and loosen the top ½ inch of soil so seed makes good contact.
- 2Sow seedMay 11 – Jun 8
Best window to sow Buffalograss in Dallam County, anchored to your local frost dates.
- 3EstablishJun 9 – Jul 6
Protect young seedlings: mow only after they reach ~3 inches and hold off on weed pre-emergents until established.
Sandy soil drains fast — water lightly and often. Aim to keep the top 1 inch moist with 2–3 short cycles a day (~0.1 in each) until germination, then taper to deeper, less frequent watering.
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
2.6"
inches of water
Monthly Water
8,051
gallons
Estimated Monthly Cost
$64.41
at $0.008/gallon average
Estimates based on 17" annual precipitation and estimated evapotranspiration. Actual costs vary by local water rates.
Common Lawn Problems in Dallam County
Drought Stress
With only 17 inches of annual rainfall, lawns in Dallam County face significant drought stress. Consider drought-tolerant grass species and deep, infrequent watering.
Learn more about regional lawn challenges at The Lawn Report.
Lawn Care Advisory: Dallam County
Lawn Verdict
Dallam 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 4,068.7 growing degree days annually, supporting vigorous warm-season lawns. Low rainfall (16.6 inches) means supplemental irrigation is essential during summer months.
Seasonal Breakdown
Wait until after April 28 to seed or overseed; soil temperatures should consistently reach 50-55°F. Cool summers (July averages 78.9°F) reduce heat stress — maintain regular mowing and moderate watering. With 80.3 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 20; this is the best renovation window. Cool winters (January averages 34.6°F) mean slow or dormant growth; keep debris off the lawn.
Watering Guidance
Low annual precipitation (16.6 inches) makes irrigation essential for maintaining green turf through summer. Currently, 100.0% of the county is in moderate drought according to the US Drought Monitor. Consider reducing irrigation frequency and allowing cool-season lawns to go semi-dormant during peak heat. Standard warm-season watering of 1 inch per week is usually adequate during summer.
Regional Context
Dallam County is 9.1°F cooler than the Texas average, it is significantly drier than the state average (15.3 inches less), USDA zone 6b helps guide grass selection compared to neighboring counties.
Dig deeper into Dallam County
Dallam County is a USDA Zone 6B, sandy-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 Dallam County in?
What is the best grass for Dallam County?
How long is the growing season in Dallam County?
How much rainfall does Dallam County get?
What is the soil pH in Dallam 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 Dallam County