Another holiday weekend, another Hallmark Channel movie marathon.

This time around, the network’s showing its most-loved summer movies, beginning Sunday morning, as part of its Countdown to Summer Memorial Day Weekend Movie Celebration. As this is the first year of Hallmark’s Countdown to Summer, fans should expect to see flicks from that programming event, as well as past Summer Nights movies.

“Sunday morning, at seven, we’re counting down our favorite summer movies to number one,” the marathon promo video explains.

There will be 18 movies total, leading up to the Countdown to Summer premiere of “Love in the Sun,” starring Emeraude Toubia and Tom Maden, at 8 p.m. EDT on Monday.

It all kicks off on Sunday at 7 a.m. EDT, and it’ll run all the way until Monday evening, with the number one movie airing at 6 p.m. EDT. There will only be one break during the marathon, and that arrives on Sunday at 9 p.m. EDT when Season 6, episode 8 of “When Calls the Heart” airs.

Right after the new episode ends at 10 p.m. EDT, the Memorial Day Weekend marathon will start right back up.

hallmark summer prince memorial marathon
Jack Turner and Taylor Cole’s “My Summer Prince” will likely be airing during Hallmark’s Memorial Day Weekend movie marathon. Crown Media / Fred Hayes

Hallmark’s being hush-hush about which movies are part of the schedule, but the promo image for the event contains photo thumbnails of three recent movies — “Paris, Wine & Romance,” “A Feeling of Home” and “Sailing Into Love.” Plus, the short preview video for the marathon shows clips from “Sun, Sand & Romance” and “My Summer Prince.”

That means there’s a good chance all five of those will be shown, but what about the other 13 movies?

Hallmarkies will just have to tune in when the Countdown to Summer Memorial Day Weekend Movie marathon starts on Sunday at 7 a.m. EDT to find out!