Lawn Care Guide for Navajo County
Navajo County, Arizona
Data Story
About Lawn Care in Navajo County, Arizona
A More Manageable High-Country Lawn
Navajo County’s lawn difficulty score of 33.1 makes it one of the easier places in Arizona to grow grass, though it still trails the national average of 50.0. This Zone 7a region offers a much cooler environment than the low-desert counties to the south.
Cooler Summers and Moderate Moisture
The county sees only 38 extreme heat days per year, which is far lower than the state average of 113. With 14.3 inches of annual rain, you still face a moisture deficit, but the 3,047 growing degree days indicate a much slower, more manageable growth pace.
Navigating High-Altitude Soil Needs
Localized soil data is limited for Navajo County, so testing your specific plot is essential for success. Most regional soils benefit from added compost to improve the structure and help retain the limited 14.3 inches of annual rainfall.
Staying Green Through Dry Spells
Navajo County has experienced drought for 53 consecutive weeks, and 81% of the area is currently abnormally dry. Mulching around lawn edges and maintaining a taller mow height can help the soil surface stay cool and retain precious moisture.
Timing Your Navajo County Planting
Hardy grasses like Buffalo grass or fine fescue thrive in this Zone 7a climate. Aim to seed or sod after the final spring frost on May 7, but well before the first fall frost arrives on October 15.
Lawn Difficulty Score
Recommended Grasses
Bermudagrass
Cynodon dactylon
Buffalograss
Bouteloua dactyloides
Blue Grama
Bouteloua gracilis
Tall Fescue
Festuca arundinacea
Climate Snapshot
Annual Precip
14.3"
Growing Degree Days
3,047.145
Base 50F
Last Spring Frost
05/07
First Fall Frost
10/15
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
2.6"
inches of water
Monthly Water
8,163
gallons
Estimated Monthly Cost
$65.31
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 Navajo County
Drought Stress
With only 14 inches of annual rainfall, lawns in Navajo County face significant drought stress. Consider drought-tolerant grass species and deep, infrequent watering.
Persistent Drought Conditions
Navajo 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.
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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