The first cool morning of October shows up and you finally take a real look at the house. The trim on the west side has gone chalky, the garage door is a shade lighter than the front door, and the fascia over the back patio has started to peel. All summer you kept reading that you should not do exterior paint once the temp goes above 90, so you waited. Now it's nice out, and you're wondering whether this is the window or whether you already missed it.
For most Allen homes this is the window, and it's the best one we get all year. It usually stays open into November, and the conditions that decide it have more to do with the wall itself than with the forecast on your phone.
Why the Wall Matters More Than the Weather App
Painters say it to each other all the time, and one on Reddit put it in a single line: surface temp is more important than air temp. A wall sitting in direct sun runs hotter than the air around it, and a west-facing wall on a clear afternoon can be 15 or 20 degrees above what the thermometer says, with dark colors running hotter still. When the surface is that hot the paint dries before it has a chance to bond. Another painter described the trouble as how it adheres after it dries entirely too fast, and that's the part you don't see until a year or two later.
That's why July was never going to work, even with a crew starting at first sunlight and stopping when it got too hot. A 98 degree afternoon in Allen puts a west wall well past anything on a paint label, and most of those labels top out somewhere around 90.
By October the numbers come back into range. Afternoons here usually land in the upper 70s to mid 80s, so even the sunny side of the house stays inside what the can calls for. On the warm days we still follow the shade around the house, which just means painting each wall while the sun is on a different one. A crew does the same thing to get through June. In October it costs nothing and it looks after the west side.
Fall Has Its Own Catch, and It's Dew
Cool nights are what make October pleasant, and they're also what put water on your siding every morning. One contractor's rule is that if you see dew on cars, you should expect dew on siding, soffits and anything else in the shade. Paint that goes over a damp surface traps that moisture under the film. When the sun warms the wall later, the moisture tries to leave, and that's where blisters and bubbles come from.
So a fall painting day is shorter than a summer one. We start mid-morning once the walls are dry to the touch, and we stop early enough in the afternoon that the last coat gets a few hours of dry air before evening. A painter up north complained that when your siding is wet every morning from dew and takes until the afternoon to dry, it's hard to get much done. Allen is milder than that. Still, the north side of a two-story in Twin Creeks or Suncreek can stay damp later than you'd guess, so we plan the order of the walls around it.
October is also one of the wetter months in North Texas, so the schedule needs some slack in it. The house gets washed before anything else happens, and washed siding and trim need real drying time before primer or paint goes on. A fall job usually takes a few more calendar days than the same job would in May, and we think the wait is worth it.
Straight Answers to What People Ask First
Is October too late to paint a house?
Not in Allen. October is usually the best exterior painting month we get, with afternoons in the 70s and 80s and nights that stay well above what the paint needs. The window generally runs into November, until the overnight lows start dropping toward the minimum temperature printed on the can.
When should you not do exterior painting?
Hold off when the surface is hotter than the paint's label allows or the wall is still damp from dew or a recent wash. The other reason to wait is cold or rain arriving before the paint has set, which means checking the overnight low against the minimum on the label.
If I paint my porch tonight after work will morning dew potentially ruin it and make me have to re paint again?
It can. Paint that goes on late in the day may still be soft when the dew settles on it, and that can leave the finish streaky or blistered. Painting earlier in the day, so it gets several hours of dry air before sunset, is the safer plan.
How Late in the Year You Can Push It
One homeowner summed up the late-season argument in two sentences: "My contractor says wait. My painter says it's fine." Either one could be right, because the answer is printed on the can. As one painter put it, some exterior paints are rated down to 35 degrees and some are rated to 50. That number applies to the wall and to the hours after the paint goes on, overnight included, so the afternoon high only tells you part of it.
In Allen that works out roughly like this. October is comfortable with almost any quality exterior paint. November is still workable, with highs typically in the 60s and lows in the 40s, as long as the product is rated for cooler temperatures and the crew wraps up early in the day. Our first freeze tends to arrive in the second half of November, and after Thanksgiving it turns into a day-by-day call. A North Texas winter has good painting days in it. You just can't plan a whole exterior around them.
If a quote puts your start date in December, it's fair to ask which paint is going on and what its minimum temperature is. We'd rather tell you to wait for March than put on a coat that won't cure. Weather drives more of the schedule than people expect, and how the seasons here affect a project is something we plan around on every job.
What on an Allen House Actually Needs the Paint
Most homes here are brick, so painting the outside usually means the trim, fascia and soffits, the siding on the gables and second story, the garage doors, the front door and the shutters. Newer subdivisions lean on fiber cement siding and trim. Older Allen homes often have wood or hardboard up there, and that material soaks up water quickly once the paint film fails.
The south and west sides go first, because that's where the sun spends the afternoon. Rub your hand along the west-side trim, and if it comes away with a chalky powder on it, the paint has weathered to where it's protecting very little. One homeowner called rapid fading and a chalk-like texture a dead giveaway, and on a west wall in Texas that's usually sun and age. It's a normal sign that it's time for exterior painting.
While you're out there, look at the bottom edges of the fascia boards, the trim near the ground and the frame around the garage door. Press anything that's peeling with a key. Soft wood has to be replaced before it's painted, because paint over rot won't hold. That kind of rot repair and small carpentry is routine for us and we handle it as part of the same job.
If you're thinking about changing the color, check with your HOA before you fall for one, because a lot of Allen neighborhoods want to approve exterior colors first. We wrote up how to choose colors that suit the house and the light it sits in. Give the sheen a minute of thought as well. The same thinking behind picking a paint finish room by room applies outside, where a flatter finish hides more on siding and a little sheen on trim and doors is easier to wash.
What a Fall Paint Job Looks Like When We Do It
We wash the house and give it time to dry. After that comes the prep, which is most of the job: scraping and sanding whatever is loose, replacing soft wood, caulking open joints and priming the bare spots. Only then do the finish coats go on. On painting days we check that the walls are dry, start on the side that warms up first, and work around the house with the shade. We stop while there's still plenty of afternoon left for the paint to set before the dew comes back.
Send us a couple of photos of the worst side of the house, which is usually the west one, and tell us whether you're keeping the color or changing it. If you'd like us to come take a look, we do interior and exterior painting in Allen and around Collin County, and you can reach us at (469) 242-3276.