The September Window – The Best Reset of the Year

There is a particular feeling that shows up in the first week of September. The mornings start to get cooler. The larches, aspens and cottonwoods glow golden and red as the late summer light searches for new and different angles through the valley. And something in the house settles. If you have kids, you probably feel it immediately. If you don’t, you probably still feel a version of it because 10+ years of school leaves marks and memories that outlast the actual classroom by a few decades.

Nostalgia, right? No, I think this autumn feeling may be more than that.

It starts with a closer look at summer. Summer gets sold as a break but for a lot of adults, especially parents, it can feel like the opposite. A 2026 survey of more than two thousand adults found that 87% of working parents reported disruptions through the summer months, and close to 70% said summer feels like a break for everyone but them. Getting coverage for kids, transporting them to and from camps and clinics, gearing up and breaking down from vacation – that’s all work. So, the relief you might be feeling right about now isn’t sentimental, it’s the end of a pretty demanding stretch of weeks that was marketed to you as your time off. Even without kids, the volume of activity and long days really starts to creep up towards the end of summertime. If you find yourself wanting summer to end so you can finally sit down or get back to some semblance of your routine, you’re not alone.

Here’s how you can tap into the transformative power of this time of year. There is a concept in behaviour change research called the habit discontinuity hypothesis. It describes how habits are cued by context. This means the room, the time of day, and the order things happen in all impact what we feel drawn to do next. When that context changes, the automatic pull of the old habit weakens, and a window opens where you can reconsider what you’re doing instead of running on autopilot. This is backed up by research on people who recently moved house or changed offices – they have an easier time changing habits than people who have not made those changes. The window of time is real, but it’s short.

This is why, in my opinion, September is a more powerful month for habits than January, even though January gets all the attention and all the resolutions. January changes a number on a calendar but not much else. September feels like the real new beginning where a lot of your routines change all at once. There’s a real discontinuity to September. It feels like engaging a clutch on the calendar and pulling apart the cogs for just a moment. Just long enough to reconsider your time, efforts, and ambitions. It offers the perfect time to start a new gym or fitness program, join the run club, or give some attention to your eating – especially if you want those habits to stick.

It also lands at the right moment. Physical activity reliably drops through fall and winter in nearly every population that has been measured. Any routine you build now, while the trails are still dry and the evenings are still light, is a routine you will have an easier time upholding in November and December. I’ve worked in the coaching space for over a decade and one thing I can tell you for certain is that January is a terribly hard time to start building a habit from scratch. September is the golden month for new things. March is a close second.

If you are one of the lucky ones who is cruising through summer with lots of momentum – don’t change a thing. Research is also clear on this. Performance resets and fresh starts help people who are struggling but they hurt people who are doing well because they unnecessarily stop behavioral momentum. Change for the sake of change is not as powerful as continued forward progress in your healthy habits. Don’t change gyms or start a new diet just because it’s September, carry what you’re doing into the shorter days and adjust your schedule as needed. 

Either way, the September window is open right now. Think about how you might want to use it!