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The rolls are the easy part. Whether a new lawn thrives depends on what happens underneath and in the weeks after: stripping the old turf, grading so water flows away from the foundation, spreading good topsoil, laying the pieces tight with staggered seams, and watering steadily until the roots knit into the ground. Sod is alive and perishable, so the job has to be timed with delivery and with someone available to water every day.
This page covers site preparation, the best times of year to lay sod in Canada, how installation is done, watering and the municipal rules around it, the first mowing, how sod compares with seed, and what to do about shade and poor soil. Routine mowing, fertilizing and weed control are on the lawn care page.
Sod installation step by step: removing old turf, grading, topsoil and staggered seams
Sod laid on compacted subsoil or over an old lawn roots poorly and dries out fast. Preparation starts with stripping the existing turf and weeds, usually with a sod cutter, and clearing out construction debris, stones and roots. The ground is then graded so it slopes gently away from the house with no low spots where water will pond, loosened wherever machinery packed it down, and covered with screened topsoil deep enough for new roots to grow into. The finished soil should sit a little below walkways and driveway edges so the lawn ends up flush with them.
Laying starts along a straight edge such as a driveway or walkway. Pieces are set snugly against each other without stretching or overlapping, with the ends staggered like brickwork so seams never line up. Gaps are filled with trimmed pieces or soil, since exposed edges dry out first. On slopes, rows run across the grade and pieces can be pegged until they root. The finished area is rolled to press the roots firmly against the soil and watered right away.
- Locates: public lines are marked before any regrading or tilling, and private lines such as irrigation, lighting or a garage feed are traced separately.
- Old turf: strip it rather than burying it, since new sod over existing grass leaves a spongy, uneven layer that stays weedy.
- Grade: fill hollows and slope the soil away from the foundation, because sod follows every dip in the surface below it.
- Topsoil: ask what depth and type of soil the quote includes and where it comes from, since weedy or clay-heavy fill undermines the lawn.
- Moisture: dampen dry soil before laying so the roots of the new sod meet moist ground.
- Same-day laying: sod should go down the day it arrives, because rolls stacked on a pallet heat up and yellow quickly.
Best time to lay sod in Canada: spring or early fall
The cool-season grasses grown for sod across most of Canada root best in cool, moist weather. That makes spring, once the soil has thawed and dried enough to work, and late summer into early fall the easiest windows. In the fall, the soil stays warm while the air cools, rain returns and weeds slow down, so new sod often roots quickly. Spring installations benefit from snowmelt and showers but need to be well anchored before the first summer heat.
Sod can go down in midsummer if you can water faithfully and your municipality allows it, but heat and drought stress fresh rolls, and a ban on lawn watering during a shortage can leave a new lawn stranded. Very late fall carries its own risk: sod that hasn't rooted before the ground freezes can dry out, shift or be damaged by snow clearing over the winter.
Watering new sod and the first mowing: care in the first weeks
The first weeks decide whether sod takes. Water right after installation, long enough to wet the soil beneath the rolls, then keep both the sod and the soil consistently moist until the roots grip. Lift a corner now and then: if the soil underneath is dry, water longer, and if it is soggy, ease off. Edges, seams and strips beside hot pavement dry first and need extra attention. Once the sod resists a gentle tug, water less often but more deeply so the roots follow the moisture down.
Check the municipal rules before the sod arrives. In Montreal, the water-use regulation lets owners water a new lawn every day for 15 days after it is laid; after that, the usual schedule based on even or odd addresses applies. Other municipalities publish their own schedules and rules for new lawns, and any of them can restrict watering during a heat wave or a shortage.
Hold off on the first mowing until the sod is firmly rooted and the grass has grown taller than your usual cutting height. Use a sharp blade set high, take off only a small part of the blade, and mow when the ground is firm enough that wheels won't leave ruts. Keep pets, play and heavy traffic off the lawn until it has knitted in.
Sod vs seed: which is better for a new lawn?
Both can produce a good lawn. They differ in speed, in how much grass choice you have and in the care each needs at the start. Sod is the more expensive material but gives an immediate result; seed asks for patience and closer attention in exchange for more flexibility.
- Speed: sod looks finished the day it is laid and can be used once it roots, while a seeded lawn takes much longer to fill in.
- Erosion: sod holds bare soil and slopes at once, while seed can wash away in a heavy rain before it sprouts.
- Weeds: sod arrives dense and crowds out weeds, while a new seedbed is open ground where weeds sprout alongside the grass.
- Grass choice: seed lets you pick a blend for shade, dry soil or low upkeep, while sod offers fewer options.
- Watering: both need steady moisture, but a seedbed must be kept damp at the surface for a longer stretch.
- Thin lawns: when the soil and grade are sound, overseeding the existing lawn, covered on the lawn care page, may be enough.
Sod for shade and poor soil: grass blends and soil tests
Most sod is grown for sunny, open lawns and relies heavily on Kentucky bluegrass, which thins out under trees and along the north side of a house. In deep shade, sod rarely lasts; a shade-tolerant seed blend richer in fine fescues, a groundcover or a mulched planting bed often suits that corner better. Ask the installer what blend is on the pallet and whether a shade mix is available.
Soil is the other half. A basic soil test measures pH and nutrients and tells you whether lime, compost or a particular starter fertilizer is worth adding before sodding, instead of guessing. Heavy clay benefits from organic matter worked into the top layer and sandy soil from compost that holds moisture, while ground packed down by months of construction traffic needs loosening before any topsoil goes on.
Why new sod fails: shrinking seams, yellow patches and poor rooting
- Shrinking, brown seams: the edges dried out, so water more and fill the gaps with topsoil.
- Yellow patches soon after laying: the sod sat too long on the pallet or went down on dry soil.
- Rolls that lift like a carpet: the roots haven't entered the soil, usually because the topsoil is thin, compacted or dry, or the sod sits on old turf.
- Mushrooms or a spongy feel: too much water or poor drainage, so ease off and check the grade.
- Puddles and soggy low spots: hollows in the grade underneath were never filled.
- Thinning under trees: not enough light for the grass blend.
Sod Installation: frequently asked questions
How often can I water new sod in Montreal?
Montreal's water-use rules allow a new lawn to be watered every day for 15 days after it is laid. After that, follow the even or odd day schedule for your address, from 3 to 6 a.m. for an automatic system or from 8 to 11 p.m. for a movable sprinkler. Elsewhere, check your municipality's schedule before the sod is delivered.
Can sod be laid over existing grass?
It shouldn't be. The old grass and thatch keep the new roots from reaching the soil, the surface stays lumpy, and the old lawn's weeds grow back through the seams. Strip the existing turf, correct the grade and add topsoil first.
When can I walk on new sod?
Walk on it only as much as watering requires until it has rooted. Test by gently tugging a corner: once the sod resists being lifted, light use can begin, and the installer can tell you what to expect for your soil and the time of year.
Will sod grow in the shade?
Standard sod handles light or partial shade but struggles in deep shade under dense trees. For those spots, ask about a shade-tolerant blend, overseed with a shade mix, or plant a groundcover instead of fighting for grass.
Should new sod be fertilized or treated for weeds?
A starter fertilizer is often worked into the soil before laying, ideally guided by a soil test; wait until the sod has rooted before feeding it again. Dense new sod rarely needs weed killers, and Ontario and Quebec both restrict many pesticides for lawns, so pulling the odd weed by hand is the usual approach.
Sources
Written by the LokalMatch editorial team. Reviewed by Zubair Afzal on September 10, 2026. How we write and check our guides