Ward Canyon trail should be open to travel all year as far as I've ever known. It's Ward-Skyline Drive that is closed to winter travel. Thought I will say the last time I went up there in winter was many years ago. I believe they've added a lower gate down by the parking lot on Ward Canyon Rd? If they have then things might have changed and you may no longer be allowed. By looking at Cruiser's
map Ward Canyon Trail isn't listed as closed but the road is. Hell I don't even see the trail listed on the map.
Google map
So if you look at it in Google maps. You'll see a dotted line that runs along Ward Canyon Rd. That's Ward Canyon Trail, this will drop you off at the upper gate that keeps you from going up Ward Canyon Rd. It runs on the other side of the canyon from the main road. There are certain areas that depending on the year and erosion it gets pretty off camber. If you don't get it right you can bit it hard and take a long tumble.