How Late in the Year Can You Paint the Exterior of a House?

If you’ve been thinking about repainting the outside of your home, you may be looking at the calendar and wondering:

Did I wait too long?

The good news is that exterior painting season doesn’t automatically end when summer does.

In fact, here in the Western Treasure Valley and Eastern Oregon, September and early fall can be some of our favorite times to paint exteriors. The intense summer heat begins to ease up, and we often get stretches of mild, dry weather that are comfortable for our crews and favorable for paint application.

The National Weather Service describes the period from mid-September through much of October in the Treasure Valley as one of the least windy times of year, with some of the area’s most pleasant weather.

But there is a catch:

The farther we get into fall, the smaller and less predictable our exterior painting window becomes.

So, how late can you actually paint your house?

There Isn't One Magic Cutoff Date

We would love to tell you that exterior painting season ends on October 15th—or November 1st—or any other specific date.

Unfortunately, Mother Nature doesn't work that way.

Exterior paint doesn't care what the calendar says. It cares about things like:

• Air temperature

• Surface temperature

• Overnight temperatures

• Moisture

• Rain

• Dew

• Humidity

• Wind

• How many hours the paint has to properly dry and cure

That means we may have excellent painting conditions one week in October and unsuitable conditions shortly afterward.

Professional exterior painting is less about asking, “What month is it?” and more about asking, “Are the conditions right for this particular coating on this particular home?”

How Cold Is Too Cold to Paint Outside?

This is where exterior paint technology has changed quite a bit.

Some modern exterior coatings are formulated for application at temperatures as low as approximately 35°F, while more traditional latex coatings may require considerably warmer temperatures to cure properly. The exact requirements vary by product, which is why professional painters follow the specifications for the coating being used rather than relying on one universal temperature rule.

And here's something homeowners don't always realize:

The temperature on your weather app isn't the only temperature that matters.

The temperature of your siding, trim, doors, fascia and other surfaces matters, too.

A sunny afternoon may reach a comfortable temperature while a shaded side of the house remains significantly cooler.

That's one reason professional exterior painting requires more planning as temperatures begin dropping.

Overnight Temperatures Matter, Too

This is one of the biggest reasons our exterior painting season eventually comes to an end.

It's not enough for the afternoon temperature to be warm.

The paint also needs appropriate conditions while it dries and cures.

As we move farther into fall in places like Payette, Weiser, Fruitland, Ontario, Vale, Caldwell, Middleton, Emmett and Eagle, daytime temperatures begin dropping and nights become colder.

The National Weather Service's long-term climate information for Boise, for example, shows normal October temperatures averaging roughly 65°F for the high and 42°F for the low.

As those overnight temperatures fall, the number of hours available for exterior painting can shrink dramatically.

Instead of having most of the day available to work, crews may need to wait for surfaces to warm in the morning and stop earlier in the afternoon.

Eventually, there simply isn't enough reliable drying and curing time to produce the quality of finish we expect.

And when we reach that point?

We would rather tell you to wait until spring than put paint on your home under conditions we aren't comfortable with.

It's Not Just the Cold—Dew and Moisture Matter

Temperature gets most of the attention, but moisture is just as important.

Cool fall nights can create dew and condensation on exterior surfaces. Paint manufacturers specifically caution against applying coatings when surfaces are too close to the dew point because condensation can interfere with proper application and drying.

That means a beautiful 65-degree fall afternoon doesn't automatically make it a perfect painting day.

We also need to consider what happened overnight, how dry the surfaces are, what conditions are expected that evening and whether the coating will have adequate time before temperatures and moisture levels change again.

Exterior painting is about the entire weather window—not just the temperature at noon.

So, Is September a Good Time to Paint a House?

Absolutely.

September can be a fantastic month for exterior painting in our area.

The hottest part of summer is beginning to pass, yet we can still have plenty of warm, dry days.

In fact, mild conditions can sometimes be preferable to painting during periods of extreme summer heat or intense direct sunlight. Paint manufacturers caution that very hot surfaces and direct sunlight can also create application challenges, which is another reason moderate temperatures can be so favorable.

If you've been putting off your exterior project because you thought summer was the only time to paint, don't assume you've missed your opportunity.

Can You Paint a House in October?

Often, yes.

But October is when we begin watching conditions much more closely.

Historically, October in the Treasure Valley can still provide beautiful stretches of weather, but cooler nights and changing conditions make the schedule less predictable.

Some October exterior projects may move forward beautifully.

Others may need to be scheduled around weather.

And eventually, we reach a point where we stop exterior painting altogether and move our crews indoors until spring.

That's why homeowners who want their exterior painted this year shouldn't wait until the weather turns to start calling painters.

By then, the remaining suitable days may already be booked.

What Happens If I Wait Until Spring?

If your home's existing paint is still protecting the exterior well and you're simply ready for a new color, waiting until spring may not create a major problem.

But if you're already seeing signs that the coating is beginning to fail, that's a different conversation.

Take a walk around your home and look for:

• Peeling or flaking paint

• Cracked or failing coatings

• Bare or exposed wood

• Significant fading

• Chalking

• Cracked or deteriorating caulk

• Areas where moisture may be getting behind the coating

Paint isn't just there to make your house look pretty.

Your exterior coating is also part of the system protecting the materials underneath it.

Once that protective coating begins failing, waiting longer can mean more preparation and repairs are needed before the home can be repainted.

Don't Wait Until the Last Warm Weekend

This is probably the biggest piece of advice we can give homeowners considering an exterior repaint this fall.

Don't use the weather forecast to decide when to start looking for a painter.

By the time you see that perfect 70-degree week coming, a reputable painting company may already have those dates booked.

There are several steps that happen before we ever open a can of paint:

1. We visit your property.

2. We inspect the exterior.

3. We identify preparation or repair needs.

4. We prepare your estimate.

5. You choose your colors.

6. We order and coordinate materials.

7. We reserve your project on the schedule.

Starting the process now gives everyone more flexibility to take advantage of those great fall painting days when they arrive.

When Does Exterior Painting Season End in the Treasure Valley?

Our answer is simple:

When the weather tells us it's over.

We don't have a hard date when every ladder gets put away.

Instead, we continually watch the forecast, temperatures, moisture and the requirements of the coatings we're using.

Our goal isn't simply to get another exterior completed before winter.

Our goal is to make sure that when we paint your home, we can do it correctly.

When conditions no longer allow us to stand behind the quality of that work, exterior painting season is finished until spring.

Thinking About Painting Your Exterior This Year? Now Is the Time to Get an Estimate.

If you're in Payette, Weiser, Fruitland, Caldwell, Middleton, Emmett, Eagle, Ontario, Vale or the surrounding area and you've been considering an exterior repaint, don't assume you've missed your opportunity.

There is still time.

But the window won't stay open forever.

September and early fall can provide some beautiful painting conditions in our area. As we move farther into fall, however, shorter days, colder nights and changing weather mean fewer opportunities to complete exterior projects properly.

So if your house is ready for a fresh color—or the existing paint is telling you it needs some attention—schedule your exterior painting estimate now.

We'll take a look at your home, talk through your options and help you determine whether we can get your project completed this season or whether it makes more sense to reserve a spot for spring.

Request Your Free Exterior Painting Estimate

Northwest Specialty Painting proudly serves homeowners throughout the Western Treasure Valley and Eastern Oregon, including Payette, Weiser, Fruitland, Caldwell, Middleton, Emmett, Eagle, Ontario, Vale and surrounding communities.