I've never seen any significant autumn frost damage on either; you might get a little dieback on the tips, but both recover well from such damage and don't suffer any long-term harm.

Resin

A little clarification of terms may be needed here......a "freeze" implies an extended period of below freezing temperatures, something that is uncommon in our climate in all but the most severe winters. If you are referring to a frost, or the occasional nighttime lows below 32F, there is little need to worry. The end of October is a bit premature for most hardy conifers here to enter dormancy and with our overly dry and rather hot summer, I'm not at all surprised your trees have responded to cooler (and wetter) fall weather by pushing new growth. It's very common and somewhat expected on trees not accustomed to dry, hot summers.

FWIW, my nursery receives stock from up and down the west coast and all conifers remain outside, exposed to all the elements, throughout the winter without damage. My own containerized plants do the same, although I do make sure containers are well watered if extended cold is expected. There is no need to move these to your garage.

I have a sequoiadendron giganteum that I grew from seed that is growing in my front yard here in the warm end of zone five poughkeepsie. The thing grows non-stop up to frost and even a little bit after frosts have become a daily experience. The darn thing is essentially decidous here, leaving only wood twigs with a bunch of brown "hairs" and a little bit of green, but by april it is all green once again, and takes off in May. It nets a bit over a foot each year. It is heading into its third year, so it is not tried and tested for too long, but it has survived continous -10 degrees fahrenheit and a few periods where the temperature went below that. I wouldn't worry about frost harming it to say the least. Although, out of two hundred seedlings it is the only one to survive, but this is not zone 8.

Resin, gardengal, thanks for the info/clairification.
Yes, last summer was a record setter for drought but I watered all my potted trees on a daily basis from June till Late Sept. The landscape trees get watered every 2-3 days during the same period.

klavier, I agree G sequioas grow like crazy. Have one potted, started out last spring w/ a 11/16" diameter trunk and it's now nearly 1.5"!! Upward growth was less than 1'.