How much notice will I be given to vacate if house is up for auction due to foreclosure?

If there has been a judgment of foreclosure and sale, your home can go to auction not less than 90 days after the judgment. The judgment will specify when the redemption period ends. You should receive a notice from the lender of the sale date. Assuming the sale is held on that date, the lender then must obtain an order approving the sale. Typically that is about 2 weeks after the sale. Then, you can be required to vacate 30 days after that.

If you want to stay in the home as long as possible, you don't have to move out until the auction purchaser sues you for unlawful detainer and gets a judgment against you. This is the same type of suit that a landlord files to evict a tenant. It is a summary proceeding, which means it can be completed much faster than ordinary lawsuits. It would then take some time for the sheriff to physically evict you, depending on how busy the sheriff's department in your county is. However, I strongly urge you to consider negotiating a cash-for-keys agreement with your lender. Lenders are often willing to pay thousands of dollars in relocation expenses in exchange for a voluntary move out, which saves the time and expense of further foreclosure and eviction proceedings.

In new jersey you do have to vacate until evicted by a judges order post sale.