Lawn Care Guide for Custer County
Custer County, Colorado
USDA SSURGO / PHZMData Story
About Lawn Care in Custer County, Colorado
The High-Altitude Challenge in Custer County
With a difficulty score of 29.5, Custer County is one of the hardest places in the nation to maintain a traditional lawn. This score is significantly lower than the state average of 37.4, reflecting the harsh realities of high-altitude Zone 5b gardening. You are working with a climate that is much more demanding than the national median of 50.0.
A Narrow Window and Dry Air
Custer County has a very short growing season, bounded by a late June frost and an early September freeze. You only have 1,279 growing degree days and a single day of extreme heat, meaning your grass grows slowly and has little time to recover from damage. The 13.6 inches of rain is better than some neighbors but still necessitates constant irrigation.
Testing the Mountain Soil Foundation
Specific soil data for Custer County is not in the current record, but high-elevation soils are notoriously thin and nutrient-poor. You must test your soil locally to check for drainage and pH, especially before attempting to grow water-heavy sod. Adding organic compost is almost always a requirement to build a viable root zone in these mountain conditions.
Enduring a Continuous Year of Drought
Custer County has spent the entire past year—53 straight weeks—in drought conditions. Currently, nearly 70% of the county is abnormally dry, which is devastating for a slow-growing lawn. Because recovery from stress is so slow here, it is better to let your grass go dormant during dry spells than to over-tax the local water supply.
Hardy Options for a Short Season
Fine Fescues and specialty mountain mixes are your best bet for the Zone 5b cold and the short summer. You must wait until after June 11th to seed, giving you a tiny window before the September 9th frost arrives. Success in Custer County is about choosing the right native-adjacent grasses that don't mind the cold or the dry spells.
Lawn Difficulty Score
Top Grass Fit for Custer 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 Custer 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
Climate Snapshot
Annual Precip
13.6"
Growing Degree Days
1,279.3
Base 50F
Last Spring Frost
06/11
First Fall Frost
09/09
Days Above 95F
1
Hardiness Zone
5b
Seeding Calendar — Zone 5B
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
2.4"
inches of water
Monthly Water
7,370
gallons
Estimated Monthly Cost
$58.96
at $0.008/gallon average
Estimates based on 14" annual precipitation and estimated evapotranspiration. Actual costs vary by local water rates.
Common Lawn Problems in Custer County
Drought Stress
With only 14 inches of annual rainfall, lawns in Custer County face significant drought stress. Consider drought-tolerant grass species and deep, infrequent watering.
Persistent Drought Conditions
Custer 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: Custer County
Lawn Verdict
Custer 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. with just 1,279.3 growing degree days, limiting options to very cold-hardy grasses. Low rainfall (13.6 inches) means supplemental irrigation is essential during summer months.
Seasonal Breakdown
Wait until after June 11 to seed or overseed; soil temperatures should consistently reach 50-55°F. Cool summers (July averages 62.8°F) reduce heat stress — maintain regular mowing and moderate watering. Aerate and overseed cool-season lawns by early fall, well before September 9; this is the best renovation window. Cool winters (January averages 23.9°F) mean slow or dormant growth; keep debris off the lawn.
Watering Guidance
Low annual precipitation (13.6 inches) makes irrigation essential for maintaining green turf through summer. Currently, 98.9% 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
Custer County is 3.1°F cooler than the Colorado 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 Custer County in?
What is the best grass for Custer County?
How much rainfall does Custer 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 Custer County