Lawn Care Guide for Jefferson County
Jefferson County, Missouri
Data Story
About Lawn Care in Jefferson County, Missouri
Steady Growing Conditions in Jefferson
Jefferson County earns a 62.9 lawn score, placing it nearly in line with the Missouri average of 63.7. This 7a hardiness zone offers a much easier growing environment than the national median score of 50.0.
Ideal Rainfall for Healthy Turf
The county receives 44.1 inches of annual precipitation, which fits perfectly within the ideal range for most lawn types. Residents manage 38 days of extreme heat, mirroring the typical Missouri summer experience.
Silt Loam Provides a Strong Base
The soil is moderately well-drained with a silt loam texture that provides a healthy balance for root growth. A pH of 6.05 and a clay content of 15.4% mean the ground retains nutrients well without excessive compaction.
Navigating Abnormally Dry Spells
Although the county faced 23 weeks of drought last year, there is currently no severe drought reported. Maintaining consistent moisture is key as 100% of the county is presently classified as abnormally dry.
Plan for Zone 7a Success
Tall Fescue is a reliable choice for the local climate and well-drained soils. Aim to start your lawn projects between the April 9th spring frost and the October 26th fall freeze.
Lawn Difficulty Score
Soil Summary
pH
6.1
Texture
Silt loam
Drainage
Moderately well drained
Organic Matter
9.6%
Recommended Grasses
Tall Fescue
Festuca arundinacea
Bermudagrass
Cynodon dactylon
Climate Snapshot
Annual Precip
44.1"
Growing Degree Days
4,094.7
Base 50F
Last Spring Frost
04/09
First Fall Frost
10/26
Days Above 95F
38
Hardiness Zone
7a
Seeding Calendar — Zone 7A
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
0.3"
inches of water
Monthly Water
800
gallons
Estimated Monthly Cost
$6.40
at $0.008/gallon average
Estimates based on 44" annual precipitation and estimated evapotranspiration. Actual costs vary by local water rates.
Common Lawn Problems in Jefferson County
Persistent Drought Conditions
Jefferson County experienced drought conditions for 23 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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