Lawn Care Guide for Summit County
Summit County, Colorado
USDA SSURGO / PHZMData Story
About Lawn Care in Summit County, Colorado
Uphill Battles for Summit Lawns
Summit County's lawn difficulty score of 33.4 reflects the harsh reality of high-altitude gardening in Hardiness Zone 5a. This score falls below the Colorado average of 37.4 and far below the national baseline. Keeping grass green here requires navigating a very short season and intense drought cycles.
Cool Breezes and Dry Skies
With an average annual temperature of 37°F and zero days reaching 90°F, heat stress is never an issue in Summit County. However, the 17.7 inches of annual precipitation is less than half of what a standard lawn needs to thrive. The low 758 growing degree days indicate a slow growth rate, meaning recovery from wear or damage takes longer than usual.
Preparing Rugged Mountain Soil
Soil data for this region is sparse, but typical mountain profiles are rocky and nutrient-poor. Homeowners should test their specific plots, as mountain soil can vary wildly between acidic and alkaline. Incorporating several inches of compost before laying sod is the best way to improve the foundation for any new lawn.
Severe Drought Affects the Entire County
The past year saw 35 weeks of drought, and currently, 100% of the county faces severe drought conditions. Outdoor water use should be strictly managed to prioritize deep root growth rather than surface moisture. Consider converting low-traffic lawn areas to native xeriscaping to reduce your overall water footprint.
Short Season Turf Strategies
Hardy, cool-season grasses like Fine Fescue or specialized mountain mixes are essential for the Zone 5a climate. Because frost dates are unpredictable and can happen nearly any month, planting in the heart of summer is often safest. Focus on maintaining a healthy lawn through the winter, as temperatures regularly dip to a 16°F average in January.
Lawn Difficulty Score
Top Grass Fit for Summit 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 Summit County.
Why we ruled these out
- Scotts Turf Builder Bermudagrass — USDA zone 5a is below Scotts Turf Builder Bermudagrass's effective range (6–11); not recommended for this county.
See our fit-score methodology for how survivability is determined.
Recommended Grasses
Buffalograss
Bouteloua dactyloides
Blue Grama
Bouteloua gracilis
Tall Fescue
Festuca arundinacea
Climate Snapshot
Annual Precip
17.7"
Growing Degree Days
757.75
Base 50F
Last Spring Frost
-9999.0
First Fall Frost
-9999.0
Days Above 95F
0
Hardiness Zone
5a
Seeding Calendar — Zone 5A
Seasonal Lawn Care Checklist
Spring
- Apply pre-emergent herbicide when soil reaches 55F
- Overseed bare spots once frost risk passes
- 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
- Core aerate compacted areas
- Apply fall fertilizer (highest N application for cool-season)
- Continue mowing until growth stops
- Rake or mulch leaves to prevent smothering
Winter
- Avoid walking on frozen turf
- Service mower and sharpen blades
- Plan spring soil amendments based on fall test
- Keep lawn clear of debris
Watering Deficit Calculator
Monthly Deficit
1.9"
inches of water
Monthly Water
5,965
gallons
Estimated Monthly Cost
$47.72
at $0.008/gallon average
Estimates based on 18" annual precipitation and estimated evapotranspiration. Actual costs vary by local water rates.
Common Lawn Problems in Summit County
Drought Stress
With only 18 inches of annual rainfall, lawns in Summit County face significant drought stress. Consider drought-tolerant grass species and deep, infrequent watering.
Persistent Drought Conditions
Summit County experienced drought conditions for 35 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: Summit County
Lawn Verdict
Summit County sits in USDA hardiness zone 5a, a transitional zone where cool-season grasses dominate but some warm-season varieties can survive. with winter lows reaching around -20.0°F. with just 757.75 growing degree days, limiting options to very cold-hardy grasses. Low rainfall (17.7 inches) means supplemental irrigation is essential during summer months.
Seasonal Breakdown
Wait until after -9999.0 to seed or overseed; soil temperatures should consistently reach 50-55°F. Cool summers (July averages 59.1°F) reduce heat stress — maintain regular mowing and moderate watering. Aerate and overseed cool-season lawns by early fall, well before -9999.0; this is the best renovation window. Winters are harsh (January averages 16.0°F); avoid foot traffic on frozen turf and plan snow mold prevention.
Watering Guidance
Low annual precipitation (17.7 inches) makes irrigation essential for maintaining green turf through summer. Currently, 100.0% of the county is in severe drought according to the US Drought Monitor. Mandatory watering restrictions may be in effect; follow local guidelines and prioritize tree and shrub watering over turf. Cool summers reduce water demand; overwatering is a bigger risk than drought stress.
Regional Context
Summit County is 8.8°F cooler than the Colorado average, USDA zone 5a 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 Summit County in?
What is the best grass for Summit County?
How much rainfall does Summit 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 Summit County