Lawn Care Guide for Hillsborough County
Hillsborough County, New Hampshire
Data Story
About Lawn Care in Hillsborough County, New Hampshire
Hillsborough Leads the State in Ease of Care
With a lawn difficulty score of 53.8, Hillsborough County is one of the easiest places in New Hampshire to grow a lawn. This score comfortably exceeds both the state average of 47.9 and the national median of 50.0. The Zone 6a climate provides a longer and more forgiving environment for homeowners compared to the rest of the state.
A Longer Season with Intense Summer Heat
Hillsborough experiences 10 extreme heat days per year, the second highest in the state, which can stress cool-season grasses during July. However, the 46.6 inches of rain and 2,460 growing degree days provide plenty of fuel for growth. The growing season is generous, stretching from the May 2 frost until the October 8 frost.
Best Practices for Southern NH Soil
While specific FIPS-level soil data is not available, southern New Hampshire often features a mix of loam and glacial till. Given the high number of growing degree days, your soil will work hard; replenishing organic matter through mulching is highly recommended. Always start your season with a pH test to ensure your grass can access the nutrients it needs to survive the summer heat.
Monitoring Dry Spells in a Busy Climate
The county has seen 38 weeks of drought over the past year, though it currently avoids the 'severe' classification found in northern counties. Because of the 10 extreme heat days, your lawn will require more attentive watering during July and August than in other parts of the state. Use a rain gauge to ensure your turf receives at least one inch of water per week, including rainfall.
Selecting Turf for a Warmer New Hampshire
Tall fescue is a smart choice for Hillsborough County as it handles the 10+ heat days better than more sensitive grasses. The best window for seeding is early May or late August, allowing the grass to establish before the frost dates of May 2 or October 8. With the state's most favorable conditions, a little effort here goes a very long way.
Lawn Difficulty Score
Recommended Grasses
Tall Fescue
Festuca arundinacea
Climate Snapshot
Annual Precip
46.6"
Growing Degree Days
2,460.429
Base 50F
Last Spring Frost
05/02
First Fall Frost
10/08
Days Above 95F
10
Hardiness Zone
6a
Seeding Calendar — Zone 6A
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 47" annual precipitation and estimated evapotranspiration. Actual costs vary by local water rates.
Common Lawn Problems in Hillsborough County
Persistent Drought Conditions
Hillsborough County experienced drought conditions for 38 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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