Lady Bugs

I bought a bucket of 1500+ lady bugs (though I don't think it really was 1500).  I think it was about $6.99.

Bought these lady bugs from the refrigerator at the nursery

An hour or so after I dumped them around the backyard garden I came out and found them all over the wood of the raised planter.  I wonder if it's too hot out for them?  I wet things down first, and there are still a million tasty aphids...  I dumped them in other parts of the garden as well, but they don't seem to be gathering like this elsewhere.  Some websites are saying they gather like this to hibernate....  Maybe I've done this out of season?

About an hour or so after I dumped them around teh backyard I saw them gathering on the wood... Wonder if it is too hot?