• Lower demand during the spring and winter often offers more availability in scheduling a roof replacement. 
• More available labor also means that roofing during the offseason can be a more economical option for homeowners.

Cons:

• Aside from possible snow and ice accumulation, cold temperatures can make your roofing materials hard and brittle.
• Your shingles may crack during installation (if they’re not rubberized), and many roofing tools don’t work as well in colder temperatures.
• In the winter season, sealants won’t be able to be applied as effectively, and shingles will take much longer to adhere to each other than they would in higher temperatures.

2. Spring

Pros:

• When the snow starts to melt, you may notice leaks in certain places on your roof. Thankfully, the spring weather is ideal for working outdoors, so there won’t be any problem with finding a contractor with more availability.
• Adhesives on asphalt shingles will be more effective with the rising temperatures.

Cons:

• Spring rains may affect your roofer’s ability to schedule your replacement, but they can generally be done in a few days depending on the size of the project and whether or not the roofer you choose has the tools and knowledge to work in the rain.

3. Summer

Pros:

• Summer is one of the best seasons to replace your roof. Temperatures are generally just right to allow all tools to operate and it doesn’t rain a lot during the Summer.
• Get your roof done faster due to the great weather and ease of application.

Cons:

• Roofers are generally busier during this time of year, so it may take a few weeks to get scheduled due to the high demand.
• Excessive heat is generally not a problem here in the Northwest, but if it is, asphalt shingles can melt in high heat.

4. Fall

Pros:

• Fall is going to be the second-best season to have your roof serviced. Going into Fall you have some cooler temperatures and light rain. 
• As it gets later into the season, it might get rainier, but for the most part, this is an optimal time to replace or repair your roof and prepare for the winter snow and rain.

Cons:

Rainy conditions can limit work if your roofer doesn’t offer their services despite the rain.