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Definitely a workout! Did this hike on Monday (11/13) and it was relatively busy at the top from it being a holiday. My phone recorded round trip about 12 miles, but I’m not sure how accurate this is. The last 0.5 miles are a grind but the view from the top is worth it. Watch for ice patches, poles are a good idea. When we hiked a group of hockey players were taking up a fire hydrant, look for it at the top!!

Did the upper caves (the challenging ones) and absolutely adored it. It gets a bit challenging in some parts but I wouldn’t consider it very hard. I enjoyed all the way.
I would recommend wearing a nice coat since the temperature is Lower downt there and definitely two sources of light (head lamp and flashlight will do) some light gloves might be helpful as well and I wouldn’t take kids younger than 8 or 9 (not only for the physical part but the fact that it’s completely dark and might find it scary)

By the way, you will need a permit in dashboard of the car to park in the lot.

hiking
2 days ago

Did both caves. Did this hike without hiking baby. And I would never do this with hiking baby. Helmet is a good idea for upper trail. Recommend 2 sources of light. 1 for use 1 for backup. You do not want to be in the upper cave without light. Rope is installed for 8ft climb. Was completely alone on upper cave. Honestly not smart to do upper cave alone. Learned my lesson on that one. I am a big guy and there is a lot of tight spaces. But I did it with a camera bag and backpack. Was alone for most of the lower cave.

backpacking
3 days ago

I got engaged on Mount Si! Great day to go for a hike. Very clear and the trail was well maintained. There is a small spot where a tree has fallen over the trail and people have made a trail through it, but coming back down it’s hard to tell where it is. All over perfect day.

6 days ago

Great Hike.

It was beautiful trail inside and out. We had our 1 year old son on my husband's back and were able to do about 95% of the cave until it was just too small to crawl through with a child on your back. the terrain is a but rough for a child under 4 to walk. We loved it.

Went up today solo, got spooked for no reason and turned back until I met with another group and they were kind enough to let me join them. It was raining on and off and we ended up crossing through two waterfalls, be very careful with your footing or you may be swept away and unless you're super careful you will likely get wet regardless. I was able to do the whole trip without trekking poles or spikes though poles would have made at least one crossing easier. Today there was 1-2" of snow at the top and it did snow on us towards the top. Really a lovely hike and I look forward to going back in fair weather!

hiking
9 days ago

A great day hike in the rain and snow.
There are two sections where the water is really flowing. The first one is quite deep, 90% of people turned back and didn't cross it that we saw.
The second one is easy, go up the hill 50 ft, it is only 2 foot wide, jump it.
Interesting easy hike. Can hear the I-90 freeway the whole hike, didn't like that.

14 days ago

The rain has arrived. Trail was not really muddy or slippery, though the top was shrouded in clouds with zero views. Good exercise as usual. Tip for getting some view under such weather: at the UPPER talus loop trail junction take a detour onto talus loop trail. In about five minutes you will arrive at the talus pile. This is low enough that it can be below the clouds, but high enough to have a descent view.

Super easy hike. The lower cave is very roomy and it’s a clear path back and out. It was a surreal experience as a first time cave-goer. My only complaint is that a duo near us had clearly been disregarding the signs not to smoke cigarettes in the cave. Without the side of fresh air, it felt like we were walking through an ashtray most of the way.

We went to the side of the upper cave. We reached a point where it seemed like it ended, so we turned around. When we were finished and left the caves and referred to the maps...we realized we hadn’t pushed on far enough and there was more to the upper cave. Will definitely go back to try it out.

Good lights- yes...I went cheap on a headlamp and it wasn’t quite bright enough for my liking

It was quite wet and drippy in there...a raincoat was nice to have.

Good, sturdy shoes. The ground is quite uneven.

hiking
16 days ago

Hiked it with my dog on 10/27. I am super out of shape but I pushed myself and made it up and down! I am proud of myself- as this hike is an ass kicker. It was beautiful. My dog had no issues, he’s in much better shape than me haha!!

hiking
17 days ago

10/28/18 Rainy day for a hike but great none the less! We took the new trail both ways. It was longer than the 8.4 mile loop from all trails. Our phone apps all said 13.1 miles, but who knows. It was steady uphill climb, but totally doable. We took breaks for water and snacks. When we got to the rock field toward the top the temperature dropped and the wind picked up. Right near the summit we had sideways rain/snow mix. It was a little scary at times since we were out in the open. While it was foggy and cloudy and rainy most of the rest of the time, it was a great hike! We are planning on going in the early summer again to see all the views.

hiking
17 days ago

Fun hike, went backwards starting from the upper caves. Completed 10-14-18

hiking
18 days ago

Amazing hike today!!! Went up Si a single lady came down engaged

Great hike today! Beautiful weather, no snow, lots of fallen leaves. Glad I brought my poles.

hiking
19 days ago

Decent traffic, great views.

hiking
19 days ago

I ran through the cave basically... really wired if you know what I mean.

The new trail is pretty straight up, with no straightaways. I was basically bear crawling up half of it. Definitely felt it the next two days after completing it, but it was well worth the views :).

Did this hike yesterday (Oct. 21). We took the old trail up and new trail down to save our knees. It was a perfect cloudless Sunday for this hike. There are parts on the old trail where it is a little hard to navigate, nothing to where you cant find the trail again though. It was definitely more steep than the new trail, but if im being honest i wish i would have taken the old trail up and down. The new trail is a bit longer than the old trail but not as steep. Plenty of people on this trail as well. Both on the old and new trail. Also, great veiws at the top. The workout is worth it.

on Kendall Katwalk Trail

23 days ago

Legit

hiking
23 days ago

Butt kicker, but a nice view at the top of the rocks. Only real downside is the number of people and an overall lack of trail etiquette

hiking
24 days ago

didn’t expect to do this underground cave today because we didn’t have proper lights. we were just going to hang out by the entrance to take pictures, but got so excited and amused by the scenes that we decided to carry on the upper (more difficult) trail using our iphones as lights. highly suggest using head lamps as you want your hands free. it’s flat rock at time, but there are a lot of boulders you need to climb.

i liked entering through the main cave entrance and taking the ground trail back to the parking lot. if i did it vice versa i would’ve probably been more uneasy taking the cave back.

it was my first cave experience / hike, but overall, i highly recommend.

24 days ago

Great view at the top. Nice shade along the trails. Overall not too much litter for as many people that visit this trail.

24 days ago

A nice walk with a lot of small creeklets and open spaces interspersed in the trees. Great for a short outing. There was a field full of lupines dried out for the fall. I bet it's amazing in the spring.

Did this hike in August, it’s a nice hike however you don’t have views till you literally reach the top. The rock scrimmage wasn’t bad, it was the loose dirt after the scrimmage for .60 miles that was a tad scary.

It took us 2hr 45 min up, we cruised up averaged 24 minutes it is steep and consistent up, but I don’t think this hike was extreme. Its hard at the top but not a hard hike.

The top was full of bugs around the mailbox, it was gross, I think someone put food inside.

I would do this hike again just for the view at the top.

hiking
1 month ago

October 13, 2018. Hiked up the old trail and down the new trail to try and save my knees. The 4,000 elevation gain was great for getting the heart rate up which I love. The 360° view at the top was beautiful. I could see Mt. Rainier, Mt. Baker, and Glacier Peak. Lots of people at the top. Met a friend down at the parking lot and hiked the whole way with him. Even went on an extra adventure from Mailbox Peak to Dirty Box Peak. Today was beautiful with blue skies and a high of 63°. Didn’t need more than a t-shirt...and extra deodorant ;) Enjoy!

Had a great trip up the old trail, over to Dirty Box Peak (just for fun), and back down the new trail. Weather couldn't have been more perfect and made a new hiking friend along the way. Views were awesome today!!

Awesome experience! I’ve never done a subterranean hike and this was absolutely amazing. It wasn’t too crowded today. I went al the way back on the lower trail until I belly crawled to a point where my brain said enough! I did a small portion of the upper trail as I soon realized my knee injury didn’t approve. I will return and finish that tho. Again. Amazing! But please please please bring a headlamp or flashlight. Saw a few iPhone users and it just didn’t cut it.

hiking
1 month ago

Recommended by friend who travels to Seattle along with many locals. Great hike, Douglas Firs were awesome and reaching the top was rewarding!

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