Fall in Northern Colorado: What Actually Happens Between September and November

Newcomers to the Front Range tend to arrive braced for winter. What they get first is one of the best stretches of weather in the country, followed by about eight weeks of the region changing its mind daily. Here is what the season actually does in Northern Colorado, roughly in the order it does it.

September is the month locals quietly hope you don't find out about

The monsoon pattern that brings afternoon thunderstorms through July and August usually breaks in the first two weeks of September. What replaces it is a long run of dry, bright days in the seventies with nights that drop into the forties. Humidity stays low. The light gets noticeably warmer and more slanted, which is why so much local photography seems to have been taken in the same three weeks.

It is also the month the crowds thin. Summer visitors have gone home, the university year has started, and the trails and downtowns belong to people who live here again. If you have any flexibility about when to do things outdoors in this region, this is the window.

Color runs down the mountain, not across the calendar

People ask when the leaves change here as though there is one answer. There is not, because Northern Colorado stacks about 6,000 feet of elevation into a short drive, and fall works its way down that ladder over roughly six weeks.

The aspens at the top go first, usually the back half of September. That is the Cameron Pass and upper Poudre Canyon window, and it is short. A hard wind at the wrong moment can strip a whole hillside in a day, which is why the timing advice you get is always vague and always urgent.

The canyons and foothills follow in early October, mostly in cottonwoods and scrub along the water rather than aspen stands. Town comes last. The maples and ash along the older residential streets in Fort Collins, Loveland and Greeley often peak in the third or fourth week of October, weeks after the mountains are bare. If you missed it up high, you have not missed it.

Patio season lasts longer than anyone expects

This surprises transplants from wetter climates. A dry sunny day at fifty degrees on the Front Range is comfortable in a jacket, and we get a lot of them through October. Restaurants here know it, which is why patio heaters start appearing in early October rather than getting packed away.

The pattern that ends it is not gradual cooling. It is the first real storm, which can arrive any time from the middle of October onward and often shows up while the trees still have leaves on them. Then it clears, and the next week is back in the sixties. Plan outdoor evenings on a three-day forecast in this season rather than a seasonal assumption. You can browse what is open around town on the Fort Collins food and drink pages.

The foothills trails are at their best right now

Spring is the difficult season for hiking here. Fall is the easy one. The foothills trails around Horsetooth, Lory State Park and the Devil's Backbone are dry, the heat is gone, the rattlesnakes have mostly gone quiet, and the reservoir views get better as the light drops.

Two practical notes. Higher elevation trails start collecting snow in late September, and a route that is dry at the trailhead can be icy in the shade at 10,000 feet. And fall is hunting season on a lot of public land in the canyons, so blaze orange is a reasonable thing to wear on national forest trails even if you are only out for the afternoon. Trailheads get busy on weekends and stay quiet midweek. More on getting outside is on the things to do pages.

What wraps up, and what moves indoors

Late October is the hinge. Most of the region's farmers markets finish their outdoor season somewhere in the second half of the month, so the last few weekends are worth catching rather than assuming there is another one coming.

October is also ski swap season along the Front Range, which is how a lot of families here get geared up without paying retail. These are usually run by clubs, shops or nonprofits, they happen on single weekends, and the good stuff goes in the first hour.

Then the shift indoors begins. Holiday markets and craft fairs start appearing in mid-November, downtown lights go up around the same time, and the shopping season here becomes a genuinely pleasant thing rather than a chore, largely because the downtowns are compact and walkable in a way that works fine in cold weather. Start with the shopping pages if you want to see what is around.

The week the season actually turns

There is usually one specific week when it stops feeling like fall. It is not the first snow, which tends to melt off in two days. It is the end of daylight saving time in early November, when sunset jumps back an hour and it is suddenly dark before dinner.

Everything after that behaves differently. Evening events start earlier. Weeknight plans get harder. The trail crowd shifts to mornings and lunch hours. It is worth knowing that this is coming, because a lot of people here spend the first two weeks of November mildly annoyed without quite identifying why.

If you want to make the most of the eight weeks before it, the short version is this: do the high country in September, the canyons in early October, and the neighborhoods late in the month. Then let the season take you indoors, which around here is not much of a hardship.

Anything happening you think we should know about is on our events page, and we are always glad to hear about what we are missing.