The pass is snow bound until July and trees are usually cut out by mid-July.
The Iron Mountain Trail #242, follows a wagon road built in 1887 as a route to haul silver ore from the Iron Mountain mine in the Flat Creek drainage, to the Clark Fork River near Cascade Campground. The trail starts near the river and is mainly used to access some of the other high quality singletrack out there that may be too steep to climb on a mountain bike.
The first 7 miles are climbable, and the remaining section to the peak is not easily doable on a bike. However, that first 7 miles is all you really need to put together some great routes in the Smoky Mountains.
This trail can get quite dusty later in the season since it tends to get a fair amount of traffic.