Very peaceful overnight camping, no permit required. Small campsite, first come first served basis. Other posts claim you can park right the site, but you can not. It’s up the yellow or blue trail depending on which one you take. However, it’s not a long walk to the parking area from the campsite.

We arrived at the parking lot of Onion Mountain Park at around 2 pm and proceeded to get our bags packed for the hike. I saw in the other review, that it is classified as a walk-in but it's definitely more of a hike. We ended up finding a very primitive spot off the blue trail (on top of the mountain), where we settled down for the night. The spot is not very big so make sure to bring a smaller tent (no group sites) but has a firepit already set up. We set up the tent and started a fire (very easy as there are sticks and wood everywhere). Overall a very good camping trip, and we highly recommend it. 

P.S - There are a lot of bugs so be prepared, and we did put a bear bag about 100 feet away.

My BSA troop has been going here for years to help new scouts learn to camp. It is a very casual site and good for your first trip, you are close to your car and the road in case you need it so no need for a bear bag. I like the sites