Could be risky. Gonna be cold in the morning. Wait at least until mid morning before launching. Low of 30 high of 55. So it will be in the 30s and 40s most of the day. Do the girls really want to go? Stick with the minnows and shorten the trip if needed. If you get them cold and bored now, you will have a heck of a time getting them to go again.
Can you go out early and see what is working and then have mom bring them to you?