Do I have to post that score?

What is an Acceptable Score?

• In an authorized format of play (see Rule 2.1a Played in an Authorized Format of Play) over at least the minimum number of holes required for either a 9-hole or an 18-hole score to be acceptable (see Rule 2.2 Minimum Number of Holes Played for Score to be Acceptable),
• In the company of at least one other person, who may also act as a marker (subject to satisfying any other requirements of the Rules of Golf),
• By the Rules of Golf (see Rule 2.1b Played by the Rules of Golf),
• On a golf course with a current Course Rating and Slope Rating, where length and normal playing difficulty is maintained at a consistent level (see Appendix G: The Golf Course, Course Rating and Slope Rating),
• On a golf course during its active season

For more information search USGA postings rules