Lawn Care Guide for Fallon County
Fallon County, Montana
Data Story
About Lawn Care in Fallon County, Montana
Fallon County Leads the State
Fallon County boasts a lawn difficulty score of 41.1, the highest in this group and well above the Montana average of 33.4. While still more difficult than the national average, the conditions in Zone 4b are relatively favorable for the region.
Balancing 33 Days of Heat
The county sees 15.0 inches of annual precipitation, which is typical for Montana but requires careful management during the 33 days of extreme heat. With 2,253 growing degree days, there is ample warmth to support robust grass growth through the summer.
Sandy Loam Advantages
A soil profile of 39.2% sand provides better drainage than many neighboring counties, though the 7.31 pH remains slightly alkaline. Regular applications of organic mulch can help lower the pH and improve the 23.2% clay structure.
Relatively Resilient Conditions
Only 4.5% of the county is currently abnormally dry, a major advantage compared to its neighbors. Despite 21 weeks of drought over the last year, Fallon County currently enjoys some of the best moisture conditions in the state.
Planting for Fallon's Climate
Cool-season blends like Perennial Ryegrass mixed with Bluegrass perform well here. Aim to seed after May 16, ensuring the lawn is mature enough to withstand the first frost on September 26.
Lawn Difficulty Score
Recommended Grasses
Blue Grama
Bouteloua gracilis
Tall Fescue
Festuca arundinacea
Buffalograss
Bouteloua dactyloides
Climate Snapshot
Annual Precip
15.0"
Growing Degree Days
2,253
Base 50F
Last Spring Frost
05/16
First Fall Frost
09/26
Days Above 95F
33
Hardiness Zone
4b
Seeding Calendar — Zone 4B
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
2.5"
inches of water
Monthly Water
7,756
gallons
Estimated Monthly Cost
$62.05
at $0.008/gallon average
Estimates based on 15" annual precipitation and estimated evapotranspiration. Actual costs vary by local water rates.
Common Lawn Problems in Fallon County
Drought Stress
With only 15 inches of annual rainfall, lawns in Fallon County face significant drought stress. Consider drought-tolerant grass species and deep, infrequent watering.
Persistent Drought Conditions
Fallon County experienced drought conditions for 21 of the past 52 weeks. Prioritize water-efficient grasses and consider reducing lawn area.
Learn more about regional lawn challenges at The Lawn Report.
Want detailed soil composition, drainage classes, and soil series data? View soil details on SoilByCounty.com
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.
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