Bivy Gear for late September Evolution Traverse

Going to try the Evolution Traverse the last weekend of September and have been researching it quite a bit but wanted to see if there was anymore insight into bivy gear on the traverse itself. We're hoping to do the full traverse in two nights and want to prepare for the worst given how late in the season it will be. Obviously if the weather is really bad we'll bail but I'm curious if a light weight tarp and a bivy sack would be enough to ride out a short storm if needed. Let me know what you think, I really just want to understand what folks who take longer on these big traverses are carrying with them. Thanks!

I did the traverse similar time last year, and took a Feathered Friends Tanager + one of those lightweight yellow thermarests. Temps dropped to around upper 20s overnight (layer of frozen water formed during nights), and I was chilly but totally fine. Did not have a bivy bag or any type of shelter - if even a short storm is in the forecast that time of year I wouldn't hesitate to change plans, it'll get real cold and snowy real quick.

J Thomson wrote:

I did the traverse similar time last year, and took a Feathered Friends Tanager + one of those lightweight yellow thermarests. Temps dropped to around upper 20s overnight (layer of frozen water formed during nights), and I was chilly but totally fine. Did not have a bivy bag or any type of shelter - if even a short storm is in the forecast that time of year I wouldn't hesitate to change plans, it'll get real cold and snowy real quick.

Makes sense. Thanks for the reply. Did verglas form on the rock? 

Hi Jacob, I just got back today from doing the routes how you describe, with two bivys. I would be happy to answer any questions you have. Text me three10 four88 seven891.

Temps are dropping in the high Sierra.

For a typical late September kit, I’d bring long-john’s, sleeping bag, and a bivy bag to keep any wind from sapping away one’s body heat.