Did you know depending on where you live you can't throw plastic planter pots into the recycling? Most recycling services do not accept plastic planter pots. The exception being the City of Seattle which will allow clean plastic planter pots to be recycled in regular curbside recycling.
If you do not live in a Seattle, you may be wondering what your options are. One option is to find a local garden center and see if they have a plastic pot take back program.
Make sure to contact these locations ahead of time to see if they are still accepting pots and what their size limitations are.
Consider putting plastic pots up on local market places. Try Posting in local buy nothing groups, Facebook Market Place, and OfferUp. Many people are looking for plastic pots for seed starting and growing plants at home. You may be able to find someone local that is in need of plastic pots and may be willing to pick them up.