Best Time of Year to Replace a Roof in Texas: Heat, Hail and Scheduling

There is no month when roofs can't be replaced in San Antonio. What changes through the year is how easy the shingles are to work, how quickly they seal, how much rain gets in the way, and how many other homeowners are trying to book the same crews. Put those together and the year sorts out like this:

• Fall (October to November): best. Mild temperatures, the spring hail season well past, and normal scheduling demand.
• Winter (December to February): good, with precautions. Most days warm up enough to work. Sealing is slower, so hand sealing matters.
• Spring (March to May): workable, but crowded. This is when most of the region's hail falls and when storm-driven demand peaks.
• Summer (June to September): workable, with early starts. Highs run above the range where shingles handle easily, and afternoon heat makes them easier to scuff.

The rest of this article explains why, with the temperature numbers, the hail data and the scheduling reality behind each season.

Asphalt shingles are held down by nails and by a strip of factory-applied sealant that bonds each course to the one below it. That sealant is activated by heat. Until it bonds, a shingle is held only by its nails, and wind can lift it.

Cold

GAF's technical guidance says shingles handle most easily above 40°F, and that in cold weather they can become brittle and crack when bent.¹ Owens Corning notes that shingles installed in cold weather may not seal until warmer temperatures arrive, and recommends hand sealing shingles along the entire roof perimeter when air and surface temperatures are at or below 40°F.² GAF lists cold weather, fall and winter among the conditions that call for hand sealing.³

The sun matters as much as the air. Malarkey's cold-weather bulletin says sealing depends on the shingle's own surface temperature, and that a little sunshine goes a long way toward activating it.⁴ A dark shingle in full sun on a 55°F day gets far warmer than the air around it.

Why the sealing step deserves attention: GAF's bulletin says installation temperature doesn't affect its warranty, but that damage such as blow-offs before the sealant activates is excluded from coverage.¹ Hand sealing in cool weather is cheap insurance against that gap.

Heat

At the other end, GAF says shingles handle most easily below 90°F. Hot shingles can stick together, tear if mishandled, and are more easily damaged by foot traffic, which is why GAF advises soft-soled shoes and shaded storage.¹ None of that makes summer a bad time to roof. It makes it a time to start early.

Normal temperatures and rainfall for San Antonio, from the National Weather Service:⁵

Read against the manufacturer guidance, Jun, Jul, Aug, Sep have normal highs at or above 90°F, and Jan, Feb, Nov, Dec have normal lows under 50°F. In Dec and Jan, normal lows of 42°F and 41°F put many mornings near the 40°F cold-weather threshold. March, April, May and October sit in the middle. October is the only one of those that is not in the spring hail window, which is why it stands out. It is also one of the wetter months, so leave a day of slack in the schedule.

May is the wettest month on average, at 4.40 inches. Rain doesn't damage a properly dried-in roof, but shingles can't go on wet decks, so wet months lose more workdays.

Central Texas hail is concentrated in spring. In the NOAA hail reports in our regional dataset for Bexar and surrounding counties (2021–2026), 97% fell between March and June, and 77% in March and April alone.⁶ That dataset covers a handful of years, so treat it as a pattern, not a forecast. It matches the region's history: the April 12, 2016 storm that dropped hail up to 4.5 inches on San Antonio caused about $1.36 billion in damage.⁷

Two things follow. First, if you're planning a replacement anyway, having the new roof on before March means it, not your old roof, takes the next hail season. If you're choosing an impact-resistant system, that timing gets it in place before the storms it is meant for. Class 4 impact-resistant shingles can qualify for a premium discount in Texas. The amount is set by your insurance carrier, so ask your agent what yours would be.⁸ See Class 4 impact-resistant roofing.

Second, a roof replaced in late spring can be hit by hail weeks after installation. No shingle is hail-proof. That isn't a reason to delay a roof that needs replacing, but it is a reason not to choose spring when you have a choice. Our San Antonio hail data page has the county-by-county record.

When a hailstorm crosses a metro area, thousands of roofs need inspection at once. Inspections, insurance adjusters, crews and materials all fill up together, and timelines stretch for everyone, including homeowners whose roofs weren't damaged but who planned to replace them that season.

The rush also brings out-of-area contractors. The Texas Department of Insurance warns that out-of-town scam artists may be the first to arrive at your door after a disaster, recommends getting at least three bids, and says to be wary of a large or full down payment.⁹ Our guide to choosing a roofing contractor covers what to check.

If your roof was damaged, don't wait for a calmer month to start the process. Policies vary and Texas law requires prompt notice. Practically, file within a year of the dated storm event, and sooner is better because proving which storm caused the damage gets harder as more storms pass over. Get the damage documented and the roof protected now through our storm damage service; the replacement itself can be scheduled once the claim is settled.

Seasonal timing is for planned replacements. It doesn't apply when:

• The roof is actively leaking. Water damage gets worse by the day.
• The ridge or deck is sagging.
• A storm has damaged the roof and you need it documented for a claim.
• Shingles are missing and the underlayment is exposed.

In those cases a repair or temporary protection comes first, through emergency roof repair or a planned repair, and the replacement follows. If you're unsure whether your roof needs replacing at all, start with signs you need a new roof.

San Antonio's normal low stays above freezing in every month of the year; the coldest is January at 41°F.⁵ The constraint here is not cold; it is hail and heat. Spring storms along the I-35 corridor through San Antonio, New Braunfels and Austin drive demand, and summer highs in the mid-90s shape how the work is done.

That makes fall the natural window for a planned replacement, and winter the quiet one. If you're reading this in late spring with a roof that's worn but not failing, the practical move is to get it inspected now and schedule the work for fall.