Public knowledge of any potential foreclosure is by way of the notice of default. At the end of 90 days, a notice trustee sale is published stating that in 21 days that the home will be sold on the auction steps. At any time during this process, the homeowner can elect to resolve this dispute with the bank by paying current or working out a loan modification agreement with their lender. Therefore the notices do not guarantee that the home will go to auction until the final day.
If you are the homeowner and wondering, based on not paying your mortgage, when the home will go into foreclosure, then you'll need to talk to your lender. Each lender has different policies, as to how soon they issue a notice of default on a property. And you will be the first to know, as the notice will be sent to you via mail, but many times posted on the door to your property as well.
I would suggest, if you are looking for a property, that you consider some of the others that are already listed.