A majority of the National Forest campgrounds offer reservable sites and already most are booked through summer. “We are filled up almost through the summer on recreation.gov reservations,” said Sarah Wheeler, spokeswoman for the Caribou-Targhee National Forest. “That’s indicative of most forests across the nation. We saw a major increase in last year and we’re seeing that it’s lining out to be the exact same for this year, too.” The Salmon-Challis National Forest has more than 60 campgrounds and the Caribou-Targhee about 50. Most campgrounds are expected to be open for the holiday weekend with a few exceptions.