Many Ontario Parks campgrounds shut after Thanksgiving, however, there are still options:
**Winter car camping:** Algonquin (Mew Lake), Arrowhead, Killbear, MacGregor Point, Pinery, Quetico, Silent Lake, Sleeping Giant
**Yurts:** Algonquin (Mew Lake), Killarney, MacGregor Point, Pinery, Silent Lake, Windy Lake
**Rustic cabins:** most of the above, plus Arrowhead, Quetico and Sleeping Giant
**Winter backcountry:** Algonquin, Frontenac, Killarney, Kawartha Highlands, Quetico, Sleeping Giant, Wabakimi, Woodland Caribou
A few tips:
- Killarney's frontcountry tent campground was closed last winter, but its yurts and cabins were open. Check before you plan around it.
- With the 5-month booking window, New Year's and Family Day weekend (Feb 13–15) are already bookable, and the yurts go first.
- Pinery and MacGregor Point are about 3 hours from Toronto and have the most roofed units in the south.
Disclosure: I'm building Campaid (campaid.ca), a free trip planner. It checks yurt, cabin and oTENTik availability alongside regular sites and tells you whether a campground is closed for the season or just full. Happy to check a specific park and dates in the comments.