Lawn Care Guide for Summit County
Summit County, Utah
USDA SSURGO / PHZMThis week in Summit County · now through Aug 20
Prime time to seed or overseed cool-season grass — soil is still warm and nights are cooling.
Data Story
About Lawn Care in Summit County, Utah
Mountain Lawns in Summit County
Summit County presents a difficult environment for traditional lawns with a difficulty score of 27.2. This is slightly below the Utah state average and far more challenging than the national average of 50.0. In Zone 5b, the focus shifts from managing heat to surviving long, cold winters and a short growing window.
High Precipitation and Cool Summers
Lawns benefit from 18.0 inches of annual precipitation, which is well above the Utah state average of 13.7. Extreme heat is rare, with only 19 days per year reaching 90°F, significantly lower than the state's 43-day average. Low growing degree days (1675) mean grass grows slowly, requiring less frequent mowing than in the valleys.
Managing High-Altitude Soil Health
Specific soil data for Summit County is currently limited, so local testing is the best way to determine your lawn's needs. Mountain soils can often be rocky or shallow, which impacts how well they hold water and nutrients. Identifying your specific soil texture will help you choose the right fertilization and aeration schedule.
Navigating Severe Mountain Drought
While 41 weeks of drought were recorded last year, 67.4% of the county currently faces severe (D2+) drought conditions. All residents are living in abnormally dry conditions, requiring careful management of mountain water resources. Using drought-tolerant fine fescues can help your lawn thrive with less supplemental irrigation.
Wait for the Early June Thaw
Your primary growing window opens after the last frost on June 7 and closes quickly by September 18. Hardiness Zone 5b is perfect for fine fescues and Kentucky bluegrass, which can handle the deep snow and cold. Seeding should occur early in the summer to ensure roots are established before the mid-September frost.
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 5b 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
Choosing grass in Summit County
Short growing season (103-day window) and severe drought (41 wk in drought / yr) are the two things working hardest against a lawn in Summit County. Here's how to choose for both — then the specific pick.
Right nowSeed cool-season grass nowYour prime fall window is open — the top cool-season picks.- Germinating fast in a short windowPre-germination and priming when the season is tight.
- 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 Summit 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
18.0"
Growing Degree Days
1,675.3
Base 50F
Last Spring Frost
06/07
First Fall Frost
09/18
Days Above 95F
19
Hardiness Zone
5b
Seeding Calendar — Summit County
Personalized to this county’s frost dates — a 103-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 5B.
Plan your seeding — Summit County
Pick a grass and a goal to get a personalized schedule anchored to this county’s frost dates.
- 1Prepare the seedbedJun 6 – Jun 19
Mow low, dethatch or rake, and loosen the top ½ inch of soil so seed makes good contact.
- 2Sow seedJun 20 – Jul 18
Best window to sow Buffalograss in Summit County, anchored to your local frost dates.
- 3EstablishJul 19 – Aug 15
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.
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
2.1"
inches of water
Monthly Water
6,570
gallons
Estimated Monthly Cost
$52.56
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 41 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 5b, a transitional zone where cool-season grasses dominate but some warm-season varieties can survive. with winter lows reaching around -15.0°F. though only 1,675.3 growing degree days favor cool-season varieties like Kentucky bluegrass and fescue. Low rainfall (18.0 inches) means supplemental irrigation is essential during summer months.
Seasonal Breakdown
Wait until after June 7 to seed or overseed; soil temperatures should consistently reach 50-55°F. Cool summers (July averages 66.7°F) reduce heat stress — maintain regular mowing and moderate watering. Aerate and overseed cool-season lawns by early fall, well before September 18; this is the best renovation window. Cool winters (January averages 23.6°F) mean slow or dormant growth; keep debris off the lawn.
Watering Guidance
Low annual precipitation (18.0 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. Cool summers reduce water demand; overwatering is a bigger risk than drought stress.
Regional Context
Summit County is 4.8°F cooler than the Utah average, it is somewhat wetter than the state average, the growing season is noticeably shorter than the state average, USDA zone 5b 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 long is the growing season in 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