Most people think of spring as lawn season. In Southwestern Ontario, fall is actually the best time of year to seed. The soil is still warm from summer, the air is cooler, weeds are slowing down, and there is usually more rain. Grass seeded now roots deep before winter and comes back thick and green in spring, well ahead of a lawn started from scratch in May.
If your lawn thinned out over a hot, dry summer, a fall overseeding is the single most effective thing you can do to fix it.
When to seed in our region
The ideal window in Glencoe and the surrounding townships runs from late August through the end of September, with early October still workable in a mild year. The goal is to get seed down while soil temperatures sit in the comfortable range for germination and give new grass six to eight weeks to establish before the first hard frost.
A simple rule: if you still have four to six weeks of growing weather ahead, there is still time to seed.
Overseeding step by step
Overseeding means spreading new seed over an existing lawn to thicken it up. It does not require tearing anything out.
- Mow low. Cut your lawn shorter than usual, around two inches, so seed reaches the soil and gets light.
- Rake and loosen. Remove thatch and debris. Loosen bare or compacted spots so seed makes contact with soil. Seed sitting on top of thatch will not germinate.
- Spread the seed. Use a broadcast or drop spreader at the rate on the bag. Overlap your passes slightly for even coverage.
- Feed the seed. Apply a starter fertilizer at seeding to fuel early root growth. This is a seeding step, not a full lawn feeding program. A starter fertilizer helps new seedlings establish before winter.
- Water. Keep the top inch of soil consistently moist until germination, usually a light watering once or twice a day for the first two to three weeks. Fall rains often do much of this for you.
- Keep off new grass. Stay off the seeded area as much as possible until the new blades are established.
Choosing the right seed
Not all grass seed is equal. For our climate, look for a quality cool-season blend of Kentucky bluegrass, perennial ryegrass, and fine fescue. Ryegrass germinates fast and gives quick cover, bluegrass fills in and spreads, and fescue tolerates shade and drought. Shady yard, high-traffic area, or new lawn versus a repair job all call for slightly different blends.
Stop in and we will help you match the seed to your yard and set you up with the right starter fertilizer for a strong first few weeks. (Planning a bigger lawn overhaul, or fighting grubs? Those are spring jobs. Watch for our spring lawn care guide.)
Frequently asked questions
Is it too late to seed in October? In a mild fall, early October can still work, especially with a fast-germinating ryegrass blend. The later you go, the more you are relying on the weather. When in doubt, seed sooner.
Will fall seed survive the winter? Yes. Grass that germinates and roots before winter goes dormant in the cold and returns in spring. This is exactly why fall seeding outperforms spring seeding.
Do I need to fertilize when I overseed? A starter fertilizer at seeding gives new seedlings the roots they need to survive winter and green up early. That is different from a full lawn feeding program, which is a spring job.
Ready for a better lawn next spring?
We stock premium grass seed blends and starter fertilizer for lawns across Glencoe and Southwest Middlesex. Visit us in store and we will help you pick the right seed for your yard.
Explore our Lawn & Garden products and services or stop by the store.
How do you overseed a lawn?
Overseeding means spreading new grass seed over an existing lawn to thicken it, without tearing anything out. Mow low, rake to expose soil, spread a quality cool-season seed at the bag rate, apply starter fertilizer, then keep the top inch of soil moist until the seed germinates.
When is the best time to overseed a lawn in Ontario?
In Southwestern Ontario, the best window is late August through the end of September, with early October workable in a mild year. Soil is still warm, nights are cool, and fall rains help germination, so grass roots before winter and returns thick in spring.
How often should you overseed your lawn?
Most lawns benefit from overseeding once a year, in fall, to stay thick and crowd out weeds. A lawn that thinned badly over a hot, dry summer may need it two seasons running before it fully fills in.
Should I fertilize after overseeding in the fall?
Apply a starter fertilizer at seeding to help new roots establish before winter. A full lawn feeding program is a spring job, not a fall one. (Reserve broadcast fertilizer detail for the spring article to avoid overlap.)