Stayed here in August and it was beautiful! We drove to the area from Denver and got stuck in traffic on the way. We went to multiple campgrounds in the area and they were all booked! Luckily, someone had just canceled when we pulled into Hecla Junction. DO NOT GO HERE UNLESS YOU MAKE A RESERVATION!
The camp host was very friendly and nice! She told us that it fills up fast and that we were so lucky to pull in when we did. Overall it was a great trip. Cool river nearby and pretty views. I'm used to backcountry camping so sites seemed pretty close together.
Rolled up without a reservation the day after Labor Day this year (9/4). Each camp spot had ample parking, and sectioned off portions of level gravel areas - one for table/fire ring and one for tents. So nice! We nabbed a spot overlooking the river, which you can hike along for about a mile. We were also able to see the Milky Way while sitting around the fire. Super nice spot.
HJ is a great campground for rafters. 20 mjnutes drive from Buena Vista. Fills up quickly, reserve early!