The most distinguishable feature of garter snake is a light shaded stripe running along its back.
Garter snake in house siding.
Lifting up the loose edges allows for some of the snakes to drop out.
Due to their combined smell a large group of garter snakes in or under your home can make your residence uninhabitable.
That one does not look like any of those so most unlikely it is poisonous.
Garter snakes living in vinyl siding removal.
These may be located at.
I had a family of garter snakes living inside my siding exactly same situation as you had when i put the deck on i removed siding to attach the ledger and half a dozen snakes came out of the lower trim piece just like you describe.
While garter snakes are generally solitary creatures they generally hibernate in large numbers to prevent heat loss and keep their bodies warm.
These are individuals that needed to be relocated.
If the affected panels of your siding are easy to remove doing so will allow the snakes a quick exit before.
Gaps between siding and stone veneers brick or any similar material should be repaired to prevent moisture damage and stop snakes from gaining entry.
They prefer to live in a warm and damp environment.
Visually inspect your siding for openings through which the snakes can find access.