April: Spring is comfortable for Texas's highest summit before summer heat. Desert blooms start in the lower canyons.
November: McKittrick Canyon's maples and oaks turn red and gold from late October to mid-November, one of the best fall color shows in Texas.
Permits and reservations
No entry reservation. Overnight trips need a wilderness permit.
Overnight wilderness permits: Required for all overnight backpacking. Reserve up to 3 months ahead (at least 2 days before the trip) for a $6 reservation fee plus $6 per person per night, then pick the permit up in person at Pine Springs Visitor Center with ID.