At our previous place, we had voles for at least five years running. We backed onto a big wetland area and with tons of trees. All the homes have chain-link fences. Basically, if they went into one yard they'd go through them all. In one spring, a neighbour two doors down replaced his entire lawn. They still came back the next year. Heck, I actually killed one with my weed wacker one time. I've seen then running through the rock garden, and even found them in the middle of my lawn in the summer of the grass was too long and thick.
After trying to trap and kill them I found it was impossible to stop them from returning. In the spring, I'd just cut the lawn short, rake it as much as I could then fertilize. Lawn is pretty amazing, and usually new growth would cover up the tracks in 2-3 weeks.
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