Read forums, #1 winter garden activity for me!
Always stuff to compost still. If you get an unusually nice day, see if any of your hardscape needs attention, like borders. Clean out potting/supply/storage area, get rid of broken pots (which I always prefer to do during non-spider/snake season!) Also a good time to lay smothers for future garden beds. Have your mower blades sharpened, engine serviced if needed.
Assess your 'winter interest' to note where improvement could be made.
Tweak your screen-saver on computer to cycle through your garden pics.
Make labels for beloved garden plants. Like a painted rock...?
Shop for clearance garden items.
Make notes of stuff you want to do in the spring.
Start buying seeds (when they get into stores after the holidays.)
Saving 'annuals' (that are really tender perennials) is one way I get more greenery in the house for winter - and ready to decorate outside again in spring. At this point, the lines have become blurred between "annuals" and house plants.
When I lived where there was snow though, a season pass to the ski place always helped pass the time!
