The Carlsbad Caverns NPS website lists their tour schedule (along with all sorts of other sundry stuff). They do recommend that you make reservations.
| Summer Tour Schedule | |
|---|---|
| Tour | Time |
| Kings Palace | Daily 10:00, 11:00, 12:00, 2:00, 3:00 |
| Left Hand Tunnel | Daily 9:00 |
| Slaughter Canyon Cave | Daily 10:00 |
| Lower Cave | Monday-Friday 1:00 |
| Hall of the White Giant | Saturday 1:00 |
| Spider Cave | Sunday 1:00 |
Summer Visitor Center Hours: 8:00 to 7:00
Natural Entrance Hours: 8:30 to 3:30
Big Room Hours: 8:30 to 5:00