• Payments as low as $33 per month
  • 0% Interest
  • Warranty included with every roof
  • Don’t pay for 6 months
  • Terms and conditions apply
416-766-0753

What is the Best Time of Year for Roofing in Ontario?

Best Time of Year for Roofing in Ontario Guide. Replacing a roof in Ontario is not just about choosing the right shingles or hiring the right contractor it’s also about choosing the right time of year. Ontario’s climate brings harsh winters, humid summers, heavy rainfall, and unexpected temperature swings.

All of these factors affect roofing materials, installation quality, and long-term durability.

epdm roofing ontario

Homeowners often ask:
“When is the best time to replace a roof in Ontario?”

While roofing can technically be done year round, some seasons offer better weather, safer working conditions, and more reliable results.

In this guide, we break down each season, explain the pros and cons, and help you decide the best timing for your roofing project.

Professional Roofers, one of Ontario’s long standing roofing companies, also uses seasonal planning to ensure high quality installation and long lasting results.

Spring: A Good Season for Roofing, but With Some Caution

Spring is a popular time for roof replacements in Ontario because:

  • The snow melts, revealing winter damage
  • Temperatures become mild
  • Roofing crews become more available after winter slowdowns

Pros of Spring Roofing

  1. Ideal Temperatures
    Spring offers moderate temperatures that allow proper adhesion of shingles and sealants.
  2. Early Damage Detection
    Winter storms often expose cracked shingles, leaks, and ice-dam damage.
  3. Faster Scheduling
    Roofing companies like Professional Roofers typically have more availability compared to summer peak season.

Cons of Spring Roofing

  1. Unpredictable Weather
    Sudden rain, late snowfalls, and high winds can interrupt work.
  2. Moisture Concerns
    Wet conditions may slow installation and affect underlayment if not protected properly.

Best Timing Within Spring

Best Time of Year for Roofing in Ontario

Late April to early June is usually safer, as early spring can still be cold and damp in many Ontario regions.

Summer: The Peak Season and the Most Reliable Time for Roofing

Summer is widely considered the Best Time of Year for Roofing in Ontario. The stable, warm weather allows roofing contractors to deliver ideal installation quality.

Pros of Summer Roofing

  1. Perfect Shingle Adhesion
    Asphalt shingles seal best between 20°C–30°C, which summer provides consistently.
  2. Low Rain Probability (Mid-Summer)
    Fewer weather interruptions mean faster completion times.
  3. Longer Daylight Hours
    Crews can work longer, helping complete large or complex roofs efficiently.
  4. Best Overall Conditions for Professional Results
    Companies like Professional Roofers prefer summer installations for maximum durability.

Cons of Summer Roofing

  1. Peak Season Pricing
    High demand may slightly increase prices.
  2. Extremely Hot Days
    Heatwaves can make installation harder for crews and may cause shingles to become overly soft.

Best Timing Within Summer

Mid-June to early September offers the most stable weather and ideal roofing temperatures.

Fall: The #1 Choice for Many Homeowners (Cool, Safe, and Convenient)

Fall is often considered the best season for roofing in Ontario, even more than summer.

Why?
Because the temperatures, humidity, and predictability align perfectly for shingle installation.

Pros of Fall Roofing

  1. Perfect Working Temperatures
    10°C–20°C is ideal for handling and sealing shingles.
  2. Low Humidity
    This improves adhesive performance and reduces moisture risks.
  3. Stable Weather
    Far fewer storms compared to spring and early summer.
  4. Winter Preparation
    Replacing an aging roof in fall prevents winter leaks, ice dams, and heat loss.
  5. High Crew Availability
    Roofing companies plan their schedules around heavy fall activity.

Professional Roofers often recommend fall as the best balance between cost, safety, and installation performance.

Cons of Fall Roofing

  1. Shorter Daylight Hours
  2. Schedules Book Quickly

Best Timing Within Fall

Late September to early November.

Winter: Possible, but Not Ideal for Most Roof Replacements

Contrary to popular belief, winter roofing can be done in Ontario—especially emergency repairs.

However, full installations require special methods and are not always ideal for standard asphalt shingles.

Pros of Winter Roofing

  1. Lower Demand
  2. Immediate Service for Emergencies
  3. Some Materials Are Still Installable
    Metal roofing, flat roofing, and some membranes can be installed safely.

Cons of Winter Roofing

  1. Shingles Do Not Seal Properly
    Cold temperatures prevent proper adhesion.
  2. Brittle Materials
    Asphalt shingles can crack during installation.
  3. Safety Risks
    Ice, snow, and slippery surfaces increase fall hazards.
  4. Potential for Short-Term Problems
    Temporary seals may be needed, with full bonding happening in spring.

Winter Roofing Is Typically Recommended Only For:

  • Urgent leak repairs
  • Wind damage
  • Storm emergencies
  • Structural issues

So, What Is the Best Time of Year for Roofing in Ontario?

Roofing worker

Based on weather patterns, material performance, and contractor availability:

1️⃣ Best Overall Season: FALL

  • Ideal temperatures
  • Stable weather
  • Optimal shingle adhesion
  • Prevention of winter damage

2️⃣ Second Best: MID-SUMMER

  • Excellent sealing conditions
  • Fast installation

3️⃣ Good with Caution: SPRING

  • Can be great, but unpredictable weather

4️⃣ Last Choice: WINTER

  • Only for emergencies or specific materials

Professional Roofers consistently schedule most of their premium roof replacement jobs in fall and mid-summer for these reasons.

Other Factors to Consider When Choosing the Right Time

1. Roofing Material Type

  • Asphalt shingles → Best in summer or fall
  • Metal roofing → Can be installed year-round
  • Flat roofing membranes (EPDM/TPO) → Prefer spring to early fall

2. Project Size

Larger homes need more stable weather.

3. Budget Flexibility

Off season jobs (late fall or winter) may be cheaper.

4. Contractor Availability

Trusted companies like Professional Roofers may have waiting lists in peak months.

Final Thoughts: Schedule Early for the Best Results

Roof replacement is a major investment, and timing can make a big difference in performance and lifespan. While roofing can be completed in any season, fall and mid summer remain the top choices for Ontario homeowners.

Whether you’re planning ahead or facing an urgent repair, working with an experienced team like Professional Roofers ensures that your roof is installed safely, correctly, and under the right conditions for maximum durability.

Terms & Conditions

PROFESSIONAL ROOFERS (a division of UXDU Contracting Inc.) offers one of the best residential and commercial warranties around.

Whereas most warranties cover only labour charges, leaving the customer to pay for material, tear off and disposal, Professional Roofers strives to go the extra mile and provide the customer with peace of mind and offers a non-prorated* warranty.

Our non-prorated* warranty covers: LABOUR, MATERIALS, TEAR OFF, and DISPOSAL.

If you have problems with your new roof and which relates to a defect in the materials. Professional Roofers will cover you according to the manufacturer’s warranty specifications for the materials we used on your house or building if the manufacturer fails to fulfil its own warranty for some reason other than the act(s) or default(s) of the customer.

ROOF SHINGLES: Our non-prorated* warranty is from 10 to 15 years depending on the package you choose when you sign the contract.

METAL ROOF: Our non-prorated* warranty is 15 years depending on the package you choose when you sign the contract. Our warranty does not cover animal damage, wind damage or any other acts of Mother Nature, discolouration, fading, corrosion, rust, fire, falling objects, or if the roof is mishandled, modified, or altered.

FLAT ROOF: We offer a five (5) year limited* warranty with respect to defects in installation.

EAVESTROUGH AND METAL WORK: We offer a five (5) year limited* warranty with respect to defects in installation and a twenty-five (25) year limited* warranty with respect to defects in materials.

SMALL REPAIRS: Normally we offer a one (1) year warranty for the area which we repair, only. However, if the problem occurs again during the one (1) year period, we are always willing to go back one more time to try and find a solution free of charge. If the problem continues thereafter, Professional Roofers will usually suggest a larger repair or new installation for which there will be an additional charge. If a whole new roof is required, the fee for the repair previously charged will be deducted from cost of the new roof.

*LIMITED WARRANTY – UXDU’s and Professional Roofer’s limited warranty only applies to damage to the shingles which have been installed by UXDU and which damage results directly from improper installation of the shingles by UXDU’s employees.

The limited warranty does not apply to defects in the shingles, nor does the limited warranty cover damage to the shingles caused by lifting or loosening of the shingles, or shingles being blown off or fall due to damage resulting directly or indirectly from wind, rain, sleet, hail or any other weather conditions. Any damaged caused by any one other than UXDU’s employees.

Other roofers second opinions will not be considered in our warranty. Any issues related with our work, must be notified to Uxdu Contracting Inc. (Professional Roofers). Defamation, slander, or bad propaganda, Professional Roofers reserves the right to nullify and terminate roof warranty and/or take legal action up to $200,000.00.

This limited warranty applies only to the supply and installation of shingles and does not cover any labor or material required with respect to the roof deck, roof trusses or rafters.