Sealer needs three things: a dry surface, a warm enough surface, and dry weather on both sides of the application. Victoria gives you all three reliably for about four months of the year, and unreliably for another two.
The realistic window
Late May through mid September is the dependable stretch. Surface temperatures are comfortably in range, the dry season is established, and you can plan a cure window without watching the forecast hourly.
April, May and late September are workable but conditional. Surface temperature is often the limiting factor rather than air temperature, because a shaded asphalt driveway in April can be a good deal colder than the thermometer suggests, and a cold surface means a slow cure and a soft film that scuffs.
October through March is not sealcoating weather here. It is not about frost, it is about water. The surface is rarely dry enough for long enough, and sealer that gets rained on before it cures does not simply take longer, it washes and streaks.
Why the window on both sides matters
Most people think about rain during the job. The problem is rain after it. Sealer needs uninterrupted dry time to cure, typically at least a day before foot traffic and longer before vehicles, and the exact figure depends on the product, the film thickness and the temperature.
It also matters before. Asphalt holds water in its texture and at its edges long after the visible surface looks dry, and sealer applied over a damp surface has a bond problem it never recovers from. On a shaded Oak Bay or Sooke driveway that can mean two or three dry days before we can put anything down, even in July.
This is why we will move a booking rather than work a marginal day. A rescheduled date costs you a week. A sealcoat laid into a wet week costs you the job.
Booking around it
The practical consequence is that the season is short and everyone wants the same twelve weeks. A few things help.
- Ask in late winter or early spring for summer work. Assessments can happen in the wet season even though the work cannot.
- Be flexible by a few days rather than by a month. We schedule against the forecast, so a movable date is far more useful than an early one.
- If the driveway also needs concrete work or the lot needs striping, book them as one sequence. Sealer first, cure, then lines.
The one thing not to do
Do not seal brand new asphalt because the season is right. New asphalt needs months to release its lighter oils, and sealing early traps them and leaves a soft surface that tracks and scuffs. Wait until the mat has weathered from black to a duller grey, generally six months to a year on the coast, even if that means missing a season.
Full detail on frequency, preparation and what sealer will and will not fix is on the driveway sealcoating page. For strata and commercial lots, the same weather constraints apply and the scheduling is on the parking lot sealcoating page.