My first trip to MtRogers which was also my first cold weather trip had me covered with a 8' x 10' tarp and I stayed warm. I didn't even have very good insulation under me yet: A 3/4 length CCF pad & a truckers windscreen.
The only time it was sort of an issue was when I got up during the night, I could feel the wind on my legs then. Not really a problem.
I even woke up Sunday morning with about 1/4" of ice on my tarp.
I have since switched to a HUGE (13.5' X 10') tarp, and I guess I am warmer, at least when out of my hammock. When set up right, I can totally close it off to the elements, in fact I have to keep in mind that I need to leave ventilation openings. But, I can walk around if "trapped" by bad weather for a long time, & even in nice weather if I need/want privacy, I can get it.
So, as others have said, & it is not a cop out answer, most of the answers at HF end with "Do whatever works for you". If you start with what you have & see how that works, if the small tarp dosn't do it, go bigger & verse vice.
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