I've been abusing Google a fair bit today. I've discovered the smallest snowshoes start at shoe size 8. Zed wears 5. So we'll have to wait on snowshoes. Tiny skis though seem to go smaller. I may opt to get him a pair of toddler skis.
I'm not having much luck finding outdoor activities however. There are lots of indoor ones:
http://www.preschool-learning-and-crafts.com/winter-activities.htmlhttp://kids-indoor-activities.suite101.com/article.cfm/indoor_activities_for_cold_north_wintershttp://kidsactivities.suite101.com/article.cfm/activity_idea_list_for_winter_dayshttp://familyplayandlearn.com/JanuaryActivities.htmlhttp://dltk-holidays.com/winter/index.htmlhttp://www.first-school.ws/theme/cpseasons_winter.htmhttp://www.atozkidsstuff.com/twinter.htmlhttp://fun.familyeducation.com/slideshow/crafts/48963.html?detoured=1Etc.
I did find a list of 50 things to do outside in winter.
http://kidsactivities.suite101.com/article.cfm/outdoor_winter_day_activitiesSome are seriously ridiculous though. "Plant pansies. They do well in a moderate climate all winter."
http://www.babyzone.com/toddler_preschooler_fun/outdoor_activites/article/outdoor-winter-fun has the standard skating, sledding and skiing, but some safety info that one may be interested in.
Forts, snowmen, and snow angels round out all the other lists. I'll keep looking later. I should be working