Last-minute holiday shopping isn't the only thing people must consider when sending out gifts at the last moment. They also have to contend with shipping deadlines from the U.S. Postal Service, UPS and FedEx.

With so many of my readers looking for last-minute gift ideas, I wanted to remind you of holiday shipping deadlines to keep in mind. This is especially important if you tend to be a procrastinator shopper and like to leave things for the last minute.

According to USPS, if you want your mail to make it to its destination by Christmas, First Class Mail should be sent by December 18. Priority Mail should be sent by December 19. Priority Mail Express should be sent by December 21.