Yellowstone Volcano Eruption Date 2025. September 8, 2025 at 9:20 pm. The most recent volcanic activity at yellowstone consisted of rhyolitic lava flows that erupted approximately 70,000 years ago.
The largest of these flows formed the. A volcanic eruption at yellowstone is unlikely anytime soon, but evidence is growing that a violent hydrothermal, or steam, explosion is possible.