Tremors, Wooden roller coaster in Athol, Idaho, US.

Tremors is a 962.6 m long roller coaster at Silverwood Theme Park in Athol, Idaho, with a twister layout and a 25.9 m lift hill. Its first drop of 30.2 m sends trains through four underground tunnels at up to 80.5 km/h, producing 2.5 g. The first tunnel passes through the ride's souvenir shop.

Park founder Gary Norton conceived Tremors after the success of Timber Terror; Custom Coasters International finalized the design and the park built it in-house, opening on 15 May 1999. Originally themed on the 1990 film Tremors, it was rethemed to earthquakes. In 2010 it became the first coaster fitted with Rocky Mountain Construction's Topper Track, and from 2021 received 208 ReTraK steel track, the last wood being replaced in 2025.

This roller coaster takes its name and theme from earthquakes, which shows throughout the station area design. Visitors notice this seismic theme reflected in the details around the queue and boarding area.

Riders should confirm height requirements before queuing, since there are different minimums depending on whether you ride with an adult or alone. Park staff can answer questions about individual ride requirements.

From 1999 to 2006 Tremors held the record for the most underground passages on a roller coaster layout, with four tunnels; The Voyage at Holiday World surpassed it with five. The first tunnel runs beneath the ride's own souvenir shop, and lamps on the trains heighten the sense of speed inside.