I live in western Washington state. I have lots of tomatillos on the my plants but there are a lot of the fruit growing out of the husk...why?
Why Are My Tomatillos Popping Out of Husk Before Ready
Certified GKH Gardening Expert
If they are growing out of the husk they are generally over ripening. As they grow and burst through the husk they will turn either yellow or purple depending on the variety.
Pick them when they fill out the husk and it is papery. You want them to still be green to still have the ideal tart flavor.
Here is a link with more information.