Old Faithful and Grand Prismatic: two boardwalks, two parking problems

Old Faithful and Grand Prismatic are different geothermal areas with different parking and walking approaches. Old Faithful sits in the Upper Geyser Basin, while Grand Prismatic’s main view uses a separate parking and overlook approach. The 2026 Yellowstone operations update also records that a temporary Old Faithful-area closure was lifted while Biscuit Basin remained closed; check the current notice instead of carrying a previous route forward (NPS 2026 operations update; 2026 handbook).

Use predictions without treating them as promises#

Old Faithful eruption predictions are estimates. Check the current estimate, walk the nearby Upper Geyser Basin boardwalks and return to the viewing area only if the timing suits the rest of the day. A prediction cannot reserve a parking space, guarantee the next eruption or make the road between basins fast.

NPS geothermal safety guidance requires visitors to remain on designated boardwalks and trails. Hydrothermal ground can be thin and water can be scalding; keep children close and never step over a barrier for a photograph (NPS geothermal safety). Grand Prismatic steam, sun and weather change the view, so use the managed overlook rather than searching for an unofficial edge.

Check road, parking and basin status on the day. Carry water and sun protection for exposed boardwalks, and keep a flexible order if one lot is full. The two basins can both be worthwhile without forcing the group to cross a closure or speed between an eruption estimate and a meal reservation.