Lawn Care Guide for Knox County
Knox County, Tennessee
Data Story
About Lawn Care in Knox County, Tennessee
Challenging Landscapes in Knox
Knox County faces tougher conditions with a lawn difficulty score of 43.5, falling below the national median of 50.0. Maintaining a lush lawn here requires more intervention than the Tennessee average of 48.0 suggests.
High Humidity and Rainfall
The county sees 36 extreme heat days annually, matching the state average. Precipitation of 55.8 inches is slightly high, which can occasionally lead to fungal issues in the humid Tennessee summers.
Excellent Drainage, Low pH
Well-drained silt loam provides an excellent physical environment for root growth, but the pH of 5.12 is quite acidic. Regular soil testing and lime applications are required to reach the 6.0-7.0 sweet spot for grass.
Smart Watering During Dry Spells
After 18 weeks of drought last year, the entire county is currently listed as abnormally dry. Focus on deep watering early in the morning to minimize evaporation and help turf survive the peak summer heat.
Establishment Timing in Zone 7b
Hybrid Bermuda or Zoysia are strong performers in Zone 7b, particularly during the hot summer months. The best growing window falls between the last spring frost on April 11 and the first fall frost on October 28.
Lawn Difficulty Score
Recommended Grasses
Tall Fescue
Festuca arundinacea
Bermudagrass
Cynodon dactylon
Climate Snapshot
Annual Precip
55.8"
Growing Degree Days
4,277.7
Base 50F
Last Spring Frost
04/11
First Fall Frost
10/28
Days Above 95F
36
Hardiness Zone
7b
Seeding Calendar — Zone 7B
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
0.0"
inches of water
Monthly Water
0
gallons
Estimated Monthly Cost
$0.00
at $0.008/gallon average
Estimates based on 56" annual precipitation and estimated evapotranspiration. Actual costs vary by local water rates.
Common Lawn Problems in Knox County
Excess Moisture & Fungal Disease
High annual rainfall (56 inches) increases risk of fungal diseases like brown patch and dollar spot. Ensure good drainage and avoid overwatering.
Acidic Soil
Soil pH of 5.1 is below the ideal range for most grasses (6.0-7.0). Apply agricultural lime to raise pH gradually.
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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