When to Start Spring Lawn Care in Scarborough

The Scarborough Spring Lawn Care Calendar

Spring in Scarborough doesn't follow a fixed date — it follows the weather. Lake Ontario's moderating influence means our neighbourhood thaws later than inland Toronto, but it also means fewer late frosts once spring truly arrives. Here's how to time your lawn care for the best results.

When Does Spring Actually Start for Your Lawn?

Forget the calendar. Your lawn's spring starts when these three conditions are met:

1. Soil temperature reaches 10°C consistently — usually late March to mid-April in Scarborough

2. Snow has fully melted and the ground is no longer saturated

3. Grass shows visible green growth at the base of the blades

In most Scarborough neighbourhoods — from Agincourt to Port Union — this window falls between April 5 and April 20. Highland Creek and Guildwood properties near the bluffs tend to warm up 5–7 days later due to lake-effect cooling.

March: Assessment and Preparation

Even before the snow fully melts, you can start:

Don't walk on waterlogged soil. Scarborough's heavy clay compacts easily when wet, and foot traffic in March can create compaction damage that lasts all season.

April: The Critical First Steps

Week 1–2: Debris Cleanup

Remove everything winter left behind:

This cleanup is critical because matted debris blocks sunlight and traps moisture, creating perfect conditions for fungal diseases. Our spring cleanup service handles all of this professionally.

Week 2–3: First Assessment Mow

Your first mow of the season should be a high cut at 3.5 inches. This removes dead tops without stressing the grass. Bag clippings on this first cut to remove thatch and debris.

Pro tip: Never cut more than one-third of the blade height in a single mowing. If the grass is 5 inches tall, cut to 3.5 — not 2.

Week 3–4: Core Aeration

Aeration is the single most beneficial thing you can do for a Scarborough lawn. Our clay-heavy soil compacts over winter, restricting root growth and water infiltration. Core aeration pulls small plugs of soil, creating channels for:

The best time to aerate is when grass is actively growing but before the heat of summer — perfect timing is late April in Scarborough.

May: Feeding and Overseeding

Once grass is actively growing (you've mowed 2–3 times), it's time to feed:

Fertilizer: Apply a balanced slow-release fertilizer (20-5-10 or similar). Organic options like corn gluten meal also provide moderate nitrogen while suppressing weed seeds.

Overseeding: If your lawn has bare or thin patches, overseed immediately after aeration. For Scarborough's conditions, we recommend:

The Weed Window

Crabgrass preventer must be applied before soil temperatures reach 15°C, which typically happens in early to mid-May in Scarborough. Miss this window, and you'll be fighting crabgrass all summer.

For broadleaf weeds like dandelions, targeted spot treatment works better than blanket applications. Our lawn care program includes strategic weed management throughout the season.

Common Spring Mistakes

Starting too early. Working wet soil causes compaction. Wait until you can walk across the lawn without leaving visible footprints.

Cutting too short. Short-cut lawns stress quickly and invite weeds. Keep the mowing height at 3–3.5 inches throughout the season.

Skipping aeration. Scarborough's clay soil needs annual aeration. Without it, no amount of fertilizer will produce a dense, healthy lawn.

Over-watering. Spring rain usually provides enough moisture. Save deep watering for June when dry spells begin.

Get Your Lawn Started Right

Whether you handle your own lawn care or prefer professional help, timing these spring tasks correctly makes the difference between a struggling lawn and a thriving one.

Contact Dawn Till Dusk Landscaping for a free spring lawn assessment, or call us at (647) 893-3876. We've been helping Scarborough homeowners grow healthier lawns for over 15 years.

Related: Landscaping services in Scarborough | Garden maintenance | Cost of landscaping in Scarborough