I'm only at around 350', but the elevation rises considerably as soon as I head north from my neighborhood. I've noticed that in some of the recent marginal events, locations around 600-700' near the base of Gambrill will have basically nothing, but once you get up to 1000', any light rain/mix will change to snow. It's kinda wild how much of a difference the top of the Watershed is compared to the base of that mountain.
Even though downtown Frederick is relatively low elevation, I think the fact that it's in a valley and surrounded by some of the ridges to the south, helps with these setups.