Lawn Care Guide for Plymouth County
Plymouth County, Massachusetts
USDA SSURGO / PHZMThis week in Plymouth County · next up in about 4 weeks (Aug 25)
Get ready to seed cool-season grass — the best fall window is about to open.
Data Story
About Lawn Care in Plymouth County, Massachusetts
Average Difficulty in Historic Plymouth
Plymouth County earns a lawn difficulty score of 54.7, aligning closely with the Massachusetts state average of 56.8. It is slightly easier to maintain a lawn here than the national median of 50.0. This Zone 6b region offers a balanced environment for traditional New England grass varieties.
High Precipitation and Moderate Heat
Plymouth receives a generous 51.4 inches of rain annually, surpassing the state average and the ideal 50-inch threshold. With only 10 extreme heat days per year, your lawn is less likely to scorch compared to inland counties. This plentiful water supply provides a strong foundation for a lush, green landscape.
Battling Extremely Acidic Soil
The soil pH in Plymouth is a remarkably low 1.96, indicating extreme acidity that can prevent most grasses from absorbing nutrients. The soil is also quite low in clay at 1.7%, which can lead to poor structure and nutrient holding capacity. Heavy applications of lime and organic matter are critical to making this ground hospitable for turf.
Strong Drought Resilience This Year
Plymouth County has experienced only nine weeks of drought in the last year, showing high resilience compared to the rest of the state. While the entire county is currently flagged as abnormally dry, the impact is minimal compared to the severe conditions found elsewhere. Routine watering during the driest summer weeks should maintain your lawn's health.
Kickstart Your Plymouth Lawn
Cool-season grasses like Kentucky bluegrass and fine fescue are the best bets for the Plymouth climate. Plan your seeding after the last spring frost on April 23 to capitalize on the moist spring weather. Focus heavily on soil pH correction this season to ensure your new grass can actually grow.
Lawn Difficulty Score
Top Grass Fit for Plymouth County
Excellent match
Jonathan Green Black Beauty Ultra
Jonathan Green
Top cultivar score: 82/100
Zone 6b vs Tall Fescue's 3–8 band.
Soil pH 1.96372445150002 vs Tall Fescue's 5.5–6.5 window.
Precipitation 51.397499999999994" + soil AWC vs Tall Fescue's 20–30" need.
Growing-degree-days + frost window vs a intermediate-difficulty establishment.
If you spend any time on lawn care forums, Reddit's r/lawncare, or YouTube lawn channels, one name comes up more than any other: Jonathan Green Black Beauty Ultra. It's practically a cult favorite, and the label, cultivar story, and long-running owner reports explain why. The secret is in the genetics.
In Plymouth County, USDA zone 6b, soil pH 2.0, Jonathan Green Black Beauty Ultra scores 82/100 — a strong zone match, adequate moisture, and a long enough establishment window.
Recommended Grasses
Tall Fescue
Festuca arundinacea
Choosing grass in Plymouth County
Acidic soil (pH 2.0) is the main thing shaping grass choice in Plymouth County. Here's how to work with it — then the specific pick.
- Amending your soil before you seedLime, timing, and the acid-tolerant shortlist.
- Tall Fescue, explainedTraits, care, and where Tall Fescue wins — the species behind your top match.
Top match for Plymouth County: Tall Fescue
See the full breakdownPremium Grass Seeds is a sister site in our network. We may earn a commission from qualifying purchases made through its retailer links — this never affects your price. Guidance here reflects your county’s climate and soil data, not hands-on testing.
Climate Snapshot
Annual Precip
51.4"
Growing Degree Days
2,776.875
Base 50F
Last Spring Frost
04/23
First Fall Frost
10/21
Days Above 95F
10
Hardiness Zone
6b
Seeding Calendar — Plymouth County
Personalized to this county’s frost dates — a 181-day growing season. Windows below are computed from local last-spring and first-fall frost normals, so they differ county-to-county even within USDA Zone 6B.
Plan your seeding — Plymouth County
Pick a grass and a goal to get a personalized schedule anchored to this county’s frost dates.
- 1Prepare the seedbedAug 11 – Aug 24
Mow low, dethatch or rake, and loosen the top ½ inch of soil so seed makes good contact.
- 2Sow seedAug 25 – Sep 22
Best window to sow Kentucky Bluegrass in Plymouth County, anchored to your local frost dates.
- 3EstablishSep 23 – Oct 20
Protect young seedlings: mow only after they reach ~3 inches and hold off on weed pre-emergents until established.
Organic (muck/peat) soil holds moisture — a single ¼-inch watering most days is usually enough; let the surface dry slightly between cycles to prevent algae and damping-off.
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 51" annual precipitation and estimated evapotranspiration. Actual costs vary by local water rates.
Common Lawn Problems in Plymouth County
Excess Moisture & Fungal Disease
High annual rainfall (51 inches) increases risk of fungal diseases like brown patch and dollar spot. Ensure good drainage and avoid overwatering.
Acidic Soil
Soil pH of 2.0 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.
Lawn Care Advisory: Plymouth County
Lawn Verdict
Plymouth County sits in USDA hardiness zone 6b, a transitional zone where cool-season grasses dominate but some warm-season varieties can survive. with winter lows reaching around -5.0°F. and 2,776.875 growing degree days, sufficient for most common turfgrasses. High annual precipitation (51.4 inches) supports lush growth but increases disease pressure.
Seasonal Breakdown
Wait until after April 23 to seed or overseed; soil temperatures should consistently reach 50-55°F. Cool summers (July averages 72.6°F) reduce heat stress — maintain regular mowing and moderate watering. Aerate and overseed cool-season lawns by early fall, well before October 21; this is the best renovation window. Cool winters (January averages 29.3°F) mean slow or dormant growth; keep debris off the lawn.
Watering Guidance
Plymouth County receives abundant rainfall (51.4 inches annually), so lawns rarely need supplemental irrigation. Currently, 100.0% of the county is in abnormally dry according to the US Drought Monitor. Cool summers reduce water demand; overwatering is a bigger risk than drought stress.
Regional Context
Plymouth County is close to the Massachusetts average temperature, it is somewhat wetter than the state average, USDA zone 6b helps guide grass selection compared to neighboring counties.
Dig deeper into Plymouth County
Plymouth County is a USDA Zone 6B, organic-soil, cool-season county. Explore the data that shapes its lawn:
Want detailed soil composition, drainage classes, and soil series data? View soil details on SoilByCounty.com
Frequently Asked Questions
What USDA hardiness zone is Plymouth County in?
What is the best grass for Plymouth County?
How long is the growing season in Plymouth County?
How much rainfall does Plymouth County get?
What is the soil pH in Plymouth County?
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.
Explore more data for Plymouth County