Here's my thinking:
Please be darn sure you have contacted the authority who oversees your proposed trail - Some are maintained by forestry, others are in a provincial park, some are in national parks, some are inside community limits (sometimes surprisingly so), etc.
Make sure the trail is open before going. Wouldn't hurt to get a name and ph.number of the person who told you it's open...
If you're not sure, DON'T GO!
Before going up a dead-end road or trail, it doesn't hurt to think about what kind of situation you'd be in if a new fire started along that road or trail: trapped, probably. Firefighters are busy enough, they don't need new complications like rescues!
That said, it is sometimes surprising what is open... I contacted the proper authority for an extremely popular backpacking trail and was told the closures don't affect that trail, even though the map I saw showed it being just inside the huge backcountry closure area. I had a backcountry permit to back me up.
I got lucky - surprisingly little smoke. Weather was good for hiking but I'm sure bad for the fires.
One more tip - it's amazing just how many fires are burning... The GREAT MAJORITY don't EVER get any mention in the press. The latitudes and longitudes of KNOWN fires can be found here (once you first select your region):
But remember that new starts happen EVERY DAY at this time of year!!
- Hank from Calgary