Few things are more disappointing during the holiday season than packages that don't arrive on time, and gift-givers in California will want to pay attention to the upcoming shipping deadlines from the U.S. Postal Service, FedEx and UPS.

If you're shipping to friends and family members in the military, the first deadline to ensure cards and gifts get there on time has already passed and international deadlines are here this weekend. The U.S. Postal Service has projected that it will ship 800 million packages between Thanksgiving and New Year's Day in 2019. Seasonal workers are hired for the increased workload, and the Postal Service will also expand Sunday delivery beginning on Nov. 24.

Related: Shop Patch's 2019 Holiday Gift Guide Here Here are all of the upcoming deadlines you need to keep in mind to ensure your mail gets to friends and loved ones by Dec. 25:

U.S. Postal Service Domestic Dec. 14: USPS Retail Ground

Dec. 20: First-Class Mail

Dec. 21: Priority Mail Service

Dec. 23: Priority Mail Express Service International

Nov. 30: First Class International (Africa, Central and South America)

Nov. 30: Priority Mail International (Africa, Central and South America)

Dec. 7: First Class International (all international locations besides Africa, Central and South America)

Dec. 7: Priority Mail International (all international locations besides Africa, Central and South America) Military Mail Nov. 27: Space Available Mail (items that must be under 15 pounds and 60 inches)

Dec. 4: Parcel Airlift Mail UPS U.S. Domestic

Dec. 13: UPS Ground

Dec. 19: UPS 3 Day Select U.S. To Canada and Mexico

Dec. 13: UPS Ground (from the 48 contiguous states only) FedEx U.S. Domestic Dec. 9: FedEx Smart Post

Dec. 16: FedEx Home Delivery

Dec. 16: FedEx Ground

Dec. 19: FedEx Express Saver U.S. To Canada