The routine you built in summer was built for summer
Somewhere around this time of year, a lot of people who started running in the spring notice that it has got harder to go. Nothing dramatic has happened. The run is the same distance on the same roads. But the evening you used to step out into is dark now by the time you get home, the air has an edge to it, and the half hour that used to feel like a reward has started to feel like something you are putting off.
If that is you, it is worth looking closely at what has changed, because the easy conclusion is that the habit was never real. That conclusion is usually wrong.
Your routine was leaning on the light
A habit is rarely just you and your willpower. It leans on things around it that you stop noticing. In summer, a good part of the work of getting out the door was being done for you. It was still light when you finished for the day, and it was pleasant outside. Other people were out walking and running, so the whole street seemed to be on your side. You made the decision to go, but the conditions made it an easy one to make.
When those conditions go, the decision gets heavier, even though you are the same person who was making it in July. The routine you built was a good one. It was built for one season, and the season has moved on without asking you.
Slipping now is not the same as failing
The trouble is how the slip feels from the inside. You miss a run because it was dark and cold and you were tired, then you miss another, and by the end of the week it can feel like proof of something you always half suspected. You were someone who ran when it was easy. Now that it is harder, here is the real you.
That story is persuasive, and it is unfair. You kept going for months. You went out on evenings when you did not feel like it, and you came back after weeks that went badly. None of that is undone because the light changed. What you are seeing is a habit meeting new conditions for the first time, and most habits wobble when that happens. The wobble tells you the conditions changed. It says very little about your character.
Rebuild it for the season you are in
A routine that worked in July may simply need rebuilding for the darker months. That is ordinary upkeep, the same as anything else you keep going through a whole year, and it goes better if you treat it as a small practical problem instead of a test of resolve.
You might move your run to a time when there is still some daylight, and accept fewer evenings for a while. Or you might keep the evening and ask less of it: a shorter loop, a route you know so well that the dark feels less strange. You might also decide that a smaller number of runs each week is the right number for winter. Keeping a modest promise all season will do more for you than making a big one in October and quietly dropping it by December. Whichever you pick, it is still the same habit. You have adjusted it so it can survive the months it now has to get through.
It helps to make that choice on purpose, ahead of time, on a day when you are rested. If you leave it, the decision gets made each evening at the door by the tired version of you, and that version has a strong opinion about staying in.
The light does come back
This part of the year is temporary, even when it does not feel that way. The evenings that are getting shorter now will start lengthening again, and the people who are still running when they do are often the ones who were gentle with themselves through the middle of winter. They did less, some weeks a lot less. They just did not decide that doing less meant they had stopped.
You do not have to run through the dark months the way you ran through the bright ones. You only need to keep some thread of it going, enough that when the evenings open up again you are picking something back up, and not starting from the beginning.
Written to encourage, not to diagnose. If something hurts or feels wrong, please speak to a doctor.