Zion and Bryce Canyon sit 72 miles apart but ask for different trips. A practical comparison of terrain, hiking difficulty, crowds, and season, so you can pick the right park or sequence both.
Neither is better in general; they suit different conditions. Zion is better in spring and autumn and for hikers who want sustained climbing and river routes. Bryce is better in summer, better for altitude-tolerant visitors who want large views for modest effort, and better for dark skies.
About 72 miles, or roughly 90 minutes of driving via UT-9 and US-89. The route through Red Canyon on UT-12 is slightly longer and considerably more scenic.
You can drive between them and see the main viewpoints of each, but you will not hike either meaningfully. Two nights near Zion and one near Bryce is the smallest itinerary that does both justice.
Zion, for most people. Its signature trails gain 1,500 to 2,100 feet with exposure and heat. Bryce trails are shorter and gentler, but they start above 8,000 feet and finish with the climb, so altitude affects visitors more than grade does.
Bryce. It receives roughly half the visitation of Zion and spreads it along an 18-mile rim road, so pullouts and southern viewpoints stay quiet even in summer. Zion concentrates far more people into a narrow canyon served by shuttle.
Angels Landing in Zion requires a lottery permit for the chained section beyond Scout Lookout. Both parks require permits for backcountry overnights. No permit is needed for ordinary day hiking in Bryce.
Late September through mid-October. Zion has cooled into comfortable hiking temperatures and Bryce is still clear and snow-free, so a single trip can cover both without fighting heat or ice.