Which is better - small or large transplant?

[dice]

JoeP, the forecast here shows no freezing temperatures
for the next week. You could move them into the garden now,
but keep an eye on the weather report, in case there is a
near-freezing night on the way (I cover them if the forecast
is 40F or less). This next rain front is moving in this weekend,
and at this time of the year that usually means winds from
the southwest, which are warm enough to keep
the temperatures above freezing, but it depends a bit on
your elevation. Try http://www.wunderground.com/ and plug
in your zip code for accurate weather and local temperatures.

I put a few out yesterday but covered them all last night.
I think I can leave the covers off at night the rest of the way.

They have been just sitting there in the cold weather we have
had. At daytime temperatures 50F and lower, they do not seem
to grow. They may grow roots, but there is no visibile change
in the seedling.

The big problem with seedlings that small in the garden is that
there is no room for cutworm collars (slit pieces of plastic
drinking straw around the stem, maybe an inch or two long)
yet. I assume that you are prepared for slugs.