Do you ever get frosts? Like sure you get below freezing, but do you wake up to hard white frozen grass?
Frosts aren’t really a hill top thing…that condensing, temp meets dew point at 100% RH is not something the mid-slopes up here see at night very often at any time of year. The atmosphere is mixed and can’t stay calm long enough to condense.
The whole idea of a frost advisory is to protect growing vegetation… and historically agriculture is more of a valley thing where frosts happen.
To be honest, as weird as it is there’s probably an elevation around my area at like 1700ft that’s the absolute last place to see 32F or lower temperatures. It freezes on the upper mountain in CAA, and then at night it’ll freeze from 1500ft and down. But there’s absolutely a mid-slope zone that’s the last place to hit 32F on the year. That’s probably like your spot. Isn’t high enough to get into the sub-freezing zone aloft during early season cold shots, and also won’t radiate during those early season troughs.