Timber Terror, Wooden roller coaster in Silverwood Theme Park, Idaho, US.

Timber Terror is a wooden roller coaster at Silverwood Theme Park in Athol, Idaho, built with a classic out-and-back layout and a helix section near the end of the track. The structure is made entirely of wood, and the train runs through a series of drops, turns, and speed changes before returning to the station.

Timber Terror opened in 1996 as Grizzly, designed by park founder Gary Norton and finalised by Custom Coasters International, with Fred Grubb assisting on the initial construction. The name was changed to Timber Terror in 1997 to avoid litigation and confusion with the Grizzly coasters at California's Great America and Kings Dominion. In 2022 the ride began partial retracking with RMC's 208 RetraK.

The ride's name comes from its wooden structure and the park's logging-country setting in northern Idaho. Its trains carry six cars, and the 823-metre track reaches 25.9 metres with a top speed of 88.5 km/h. The coaster was designed by park founder Gary Norton, finalised by Custom Coasters International and built in house.

There is a minimum height requirement to board, so smaller children may not be able to ride. Visiting earlier in the morning or later in the afternoon tends to mean shorter lines, making it easier to ride more than once.

The ride's footage appeared as a looping video backdrop in Apple's Photo Booth from 2007 until video backdrops were removed in 2019's Catalina. Visible "Grizzly" signage in the clip shows it was filmed in 1996–97, before the rename. The file still sits in the System folder's Compositions directory on current Macs.