Hi Brianne, 

It is getting pretty late and if you bring the cocoons in to clean at this point, the bees will likely start emerging. As you likely know, this is best done in October, after the bees have fully completed their development. After cleaning in October, the cleaned cocoons can also be placed in the fridge to reduce the bee's consumption of fat reserves. 

The linked calendar by Linn County Master Gardeners is an excellent guide to when to put cocoons out.

Also, sign up for their Bee Notes, which will get you timely information on what to do to ensure success with mason bees. Sign up here. 

Best,
Andony

Thank you. Would it make a difference if I cleaned them outside tomorrow when it's still cold? Or just wait to put the tubes out when it gets warmer at this point?

Thanks, Brianne, 

Doing the cleaning in the cold will help. You may want to insect the cocoons with a hand lens before cleaning them - if there are not a lot of pollen mites on the cocoon surface, I might just avoid cleaning them this year. If they are loaded with mites, might be worth doing a late cleaning. 

Best,
Andony

Thank you!