Overseeding Calculator
Calculate how much seed you need for overseeding your lawn.
Dense, dark green lawn. Slow germination (14-28 days).
Seed Needed
Weight
4.5 lb
(2.0 kg)
Rate
1.5 lb/1000 sq ft
Seed Cost
$36 – $54
Methodology & Notes
Overseeding rates are: Kentucky bluegrass 1.5-3 lb/1000 sq ft, perennial rye 4-8 lb/1000 sq ft, fescue mix 3-6 lb/1000 sq ft. Light rates are for annual maintenance; heavy rates for thin or damaged lawns. Seed prices are approximate (Montreal retail). Best time to overseed in Montreal is late August to mid-September.
Get an Accurate Free Estimate
These calculators provide rough estimates. For an exact price, call us or send photos of your project.
“The secret to successful overseeding in Montreal is timing and soil contact. I always recommend aerating first — the seed needs to touch soil, not sit on top of thatch. Late August gives you the warmest soil and the least weed competition.”
How to use this tool
Enter your lawn area in square feet and select the grass seed type: Kentucky bluegrass for a classic Montreal lawn, perennial ryegrass for fast germination, or fine fescue for shady areas. Choose whether this is a light overseed or a heavy renovation. The calculator estimates seed quantity needed in kilograms and the approximate cost based on current Montreal garden centre pricing.
Why it matters
Overseeding is the most effective way to thicken a thin or patchy Montreal lawn without starting from scratch. The best time to overseed in Quebec is late August through mid-September when soil temperatures are still warm enough for germination but air temperatures are cooling. Spring overseeding is possible but competes with crabgrass and weed germination. A thick, healthy lawn naturally crowds out weeds, reducing or eliminating the need for herbicides.
Frequently Asked Questions
When is the best time to overseed a lawn in Montreal?
The best time to overseed in Montreal is late August to mid-September. Soil is still warm for germination while cooler air reduces stress on seedlings. Spring overseeding (April-May) is possible but competes with weed germination and requires more watering.
How much does overseeding cost in Montreal?
Professional overseeding in Montreal costs $0.10 to $0.25 per sq ft in 2026, or roughly $500 to $1,250 for a 5,000 sq ft lawn. DIY overseeding with quality seed costs about $150 to $300 for the same area. Montréal Paysagement Pro offers full service — call 514-900-3867.
What grass seed is best for Quebec lawns?
Kentucky bluegrass is the gold standard for Montreal lawns — it handles cold winters and creates a dense, attractive turf. Mix it with perennial ryegrass for faster fill and fine fescue for shaded areas. Avoid warm-season grasses like Bermuda which cannot survive Quebec winters.