Boulder Lake Carlyle Camping Area in Illinois is situated on a picturesque lake with stunning views of the surrounding area. The campground offers 80 primitive campsites with nearby access to fishing, boating, and hiking. Campground amenities include a boat launch, picnic areas, and fire pits. Reservations can be made online or on-site, and the campground is open from April to November. The best time to visit is during the summer months, with average temperatures ranging from the mid-70s to mid-80s°F.