Quick Answer
Hardwood mulch yardage for a Plymouth County bed comes out of one formula: (square feet x inches deep) / 324 = cubic yards. A typical Plymouth County front-and-side bed runs 250-400 square feet, which works out to 1.5-2.5 cubic yards at 2 inches deep. Measure the beds in 20 minutes, run the math, round up to the nearest half yard, and place one clean bulk order before the March 15 trucking surge.
Why March 1 Is the Right Day to Run This Math
March opens mulch season across Plymouth County. By the second week of March, deliveries from Brockton out to Plymouth, Halifax, Hanover, and Duxbury start booking 7-10 days ahead. Homeowners who measure on March 1 still have a clear delivery window. Homeowners who guess on April 5 are paying a freight premium and waiting two weeks.
The math itself is grade-school. The cost of getting it wrong is a half-yard pile sitting on a tarp through July, or a second delivery fee for a top-up. See How Cohasset Contractors Pre-Stage Mulch in Late February for the contractor-side timing on the same week.
Step 1 - Sketch the Beds
Walk the property with a tape measure and a clipboard. Sketch the house outline. For each bed, record length x width to the nearest foot. Don't try to be precise on curves - measure the longest run and the average width.
Plymouth County bed types you'll see most:
- Front foundation bed: 4 ft wide x 30-40 ft (the front of a colonial or ranch) = 120-160 sq ft
- Side-yard shrub line: 3 ft wide x 30-50 ft = 90-150 sq ft
- Back patio border: 2-3 ft wide x 20-30 ft = 40-90 sq ft
- Tree rings (each): 9-12 sq ft per tree at a 3-ft radius
- Mailbox / lamppost circle: 6-9 sq ft
Sum the numbers. Most Plymouth County yards land between 250 and 400 square feet of bed.
Step 2 - Apply the Yardage Formula
The formula:
(Square feet x inches deep) / 324 = cubic yards
The 324 is fixed: 1 cubic yard = 27 cubic feet, and 27 x 12 inches = 324 inch-square-feet of coverage.
Worked example - 300 sq ft Plymouth ranch at 2 inches deep:
300 x 2 / 324 = 1.85 cubic yards. Round to 2.
Worked example - 400 sq ft Halifax colonial with 100 sq ft of new beds (3 inches) and 300 sq ft of established beds (2 inches):
(100 x 3) + (300 x 2) = 300 + 600 = 900 900 / 324 = 2.78 cubic yards. Round to 3.
Step 3 - Use the Quick Reference
Memorize one number: 1 cubic yard of hardwood mulch covers 162 sq ft at 2 inches deep.
- 200 sq ft -> 1.25 yd
- 300 sq ft -> 1.85 yd (round to 2)
- 400 sq ft -> 2.5 yd
- 500 sq ft -> 3.1 yd (round to 3)
- 600 sq ft -> 3.7 yd (round to 4)
Browse the mulch collection for current per-yard pricing. Plymouth County delivery is on standard route from the Brockton yard.
Step 4 - Add the Forgotten Spots
Plymouth County yards reliably miss the side-yard utility strip behind the AC condenser, the foundation gap behind shrubs, and any tree ring more than 10 feet off the front walk. Add a half yard to the order for those.
For the broader March kickoff list, see March Mulch Trucking Update for Newton Routes - same trucking math runs through Plymouth County.
Step 5 - Place the Order Once
Bulk hardwood mulch is the cheapest option per cubic yard for any order over 1.5 yards. Below 1.5 yards, bagged starts to compete on convenience. Ottr delivers in half-yard increments by the Hauling Services 14 Cubic Yard Truck. One clean order beats two staggered deliveries every time.
For the regional yardage-vs-tonnage comparison (when stone is in the same project), the 2026 Suffolk County Tonnage Walk-Through covers the conversion math.
Common Mistakes in the Math
- Including lawn area in the bed measurement. Lawn doesn't get mulched.
- Applying at 1 inch "to stretch the order" - mulch breaks down faster than weed seed germinates. 2 inches is the established-bed floor.
- Using bag-label coverage as gospel - bags vary in compaction.
For the broader depth question, UMass Extension Landscape, Nursery & Urban Forestry has the authoritative regional standard: 2-3 inches over established beds, 3 inches max on new beds.
The 30-Minute Worksheet
- Sketch the property outline.
- Measure each bed (length x width to nearest foot).
- Sum total square feet.
- Multiply by depth in inches (2 established, 3 new).
- Divide by 324.
- Round up to nearest half yard.
- Add half a yard for forgotten spots.
- Place the order through /collections/mulch or /collections/plymouth-county-landscape-supply.
The short version: most Plymouth County beds need 1.5-2.5 yards of hardwood mulch at 2 inches. Measure once, do the math, order once, and you're done before the trucking surge hits.
