“A full-on downhill trail with loads of jumps.
— Eric Ashley
Trails in the Yacolt Burn State Forest are generally open year round but require the use of a Discover Pass. The area and trails are remote and there is extremely poor cell service make sure your party is properly equipped.
Thrillium can be ridden as a pedal, but most will choose to shuttle. The trail ends adjacent to a bridge with a small parking area. For the return to the top, follow Road L1000N past the Larch Corrections Center and then turn left on Road L1500 until you reach the yellow gate past the gun range quarry. There is a small area near the gate for parking.
Head over the gate for a short push/pedal up Road L1510. Enter the trees on the left across from the first right-hand switchback. Climb up the singletrack until you see the "difficult terrain" sign and the Thrillium placard suspend to the left. Get ready for the fast and exciting ride ahead.
Thrillium gives you a small warm up before settling in for high-speed berms accented with drops, kickers, doubles, and tables. Most everything is rollable in this section but if in doubt, scope it out. And although the berms are large, a scattering of stones across their surface can make for a loose ride. Especially the baby-head rocks before the first road crossing.
The next section opens with an optional drop off the road headed into a series of doubles. Pretty soon, the trail flattens out as you enter a rich forest. You'll need to keep your speed up if you want to keep clearing tabletops. Next up, a couple of optional hips and gaps keep things lively until the next road crossing.
Thrillium really takes off through this clear cut section by serving up tons of table tops and the occasional double. The section has the biggest hits (20-30' in length) early on and then they get more manageable towards the end. The trail itself is pretty wide, but the advanced nature of the jumps and the logs and stumps strewn about really make you want to land cleanly.
The next road crossing leads into two massive steep turns flying into high-speed step downs. Not to be undermined at the end, Thrillium keeps packing in more impressive tables and jumps right up to the finish.
Thrillium can be ridden on a trail bike, but more than any trail I've ridden recently, it made me feel like a DH bike would be a better ride option for the day.