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September apparently
https://www.renfrewshire.gov.uk/Foxes
If you discover an active fox den in your garden, it would be cruel and illegal to block up the entrance or take measures to evict the cubs. Cubs are born in March and abandon the den completely by August or September, so it is best to wait until September
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Before you do, Block the entrance with loose sticks. If the sticks don’t get moved for a couple of days, it’s empty.
We went the other way and planted near the entrance with grasses that give cover to the den entrance. We also put sturdy delivery boxes out for the cubs to play on while they develop the key skill of ripping stuff apart, they’re now destroyed and we keep moving the remaining shreds to the borders to rot down.
Ive currently got some fox cubs under my shed/office in my garden. I can hear them squeaking and moving around while im working, so hopefully im not disturbing them too much and they still feel safe an un-stressed there. I reckon they'd probably have moved elsewhere by now if they weren't happy - we've got a dog so they must at least feel safe enough from him to stay.
I had been planning to seal up the gap under the building (it's a timber frame, sat on concrete piers, so there's a decent gap underneath it) with rat-proof wire mesh this summer, but I now am worried about trapping any foxes in there. When could I reasonably expect them to have weaned the cubs and moved out? A couple of months?