I started my seedlings about 2 weeks ago indoors (bachelor buttons, moss rose, sweet pea, 4 o'clocks, mammoth sunflowers, catnip, and petunias). They are all doing well and are a few inches tall. I have transplanted them into bigger pots and they are taking up much more space.

I am starting to harden them off outside during the day and I was thinking about moving them to the garage at night. The temperatures at night have been in the high 50's to 60's but there are a few nights where it drops into the 40's. The garage is detached from the house so it won't get any warmth from the house. Is this too cold or too soon to move them into the garage at night?