Fortunately there are some measures you can take to keep them away.
Snake proof garage door.
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Magzo door draft stopper 36 under door noise blocker sound proof cold weather door snake draft stopper weighted heavy duty reduce noise saving energy under door guard 36in x 3in grey 4 5 out of 5 stars 2 152.
In the photo you can see on this particular repair i also had to add a very small bock of pvc behind the trapezoidal block.
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Snakes can find it easier to sneak through the hole of any size since they have flexible body structure.
Glue it in with construction adhesive.
How to snake proof your yard.
Older garages are susceptible to getting very small holes in the walls and underneath the garage door by a worn out weather seal.
Custom garage doors in orange county.
Despite whatever you have read or heard there are no smell or taste repellents scientifically proved to shoo snakes away.
Line the pvc filler block up with the back of the door trim and flush with the surface the weatherstripping will be attached to.
You can carefully look around your garage if it has a hole of any scale and should seal it out no matter how tiny or big it is.