How long should I wait to take my guinea pigs outside

[Nfrye]

My grass was recently fertalized how long should I wait before I let them outside to eat grass again

 

[Claire W]

We always wait until the lawn has been mowed at least 3 times before allowing them back on the grass

 

[Mother Hubbard]

Defo couple of weeks, 2-3 longer if you can. And yes only after grass being cut a few times too.
Sorry