If you do end-up closing the pool completely and lowering the water level, you might consider lowering more than required just so that perhaps you can take advantage of winter rains and/or city water replacement in stages to help lower any iron content in the pool. If budget allows, perhaps look into a water softening product if you don't already have one available that may help you replenish the pool with iron-free water (if needed) beyond what the city provides. In the long run, anything you can do now to reduce iron content will surely help next season. Doing the whole pH-iron-FC juggling act is challenging at best. I'm sure you know that already.
Enjoy the rest of your weekend.