This is the most practical seasonal fact on the page and the one most likely to catch you out.
On the long summer schedule — which the park published as 9 March to 1 November for 2026, tracking daylight saving time — the shuttle's first bus leaves the visitor center at nine and the last bus up from the lower town goes at seven in the evening. That gives you a genuine evening: Jefferson Rock in the last hour of light, then a ride back up the hill.
Through the standard-time season, the last bus from the lower town goes at half past five. The exhibit buildings still close at five, and sunset comes early enough that your afternoon effectively ends when the museums do.
Two things hold steady all year. Museums, exhibits and lower-town restrooms run nine to five. Trails and parking lots open thirty minutes before sunrise and close thirty minutes after sunset, which makes an early start legal in any season and an evening ridge walk not.
The practical consequence: in winter, arrive at nine and treat the day as five hours rather than nine. In summer, the sensible shape is an early climb, the middle of the day in the exhibit rooms or on the water, and the last hour on the hill. And in any season, if you are still down in the lower town when the last bus goes, the way back up is the Visitor Center to Lower Town Trail on foot.