Here's what will be airing on the Hallmark channels on Martin Luther King Day, all times Eastern:

Hallmark Channel-

5am-Reba: "Invasion" (S5E9, OAD: November 18, 2005)
5:30am-Reba: "Issues" (S5E10, OAD: December 9, 2005)
6am-Reba: "Brock's Got Stories" (S5E11, OAD: January 13, 2006)
6:30am-Reba: "Parenting with Puppets" (S5E12, OAD: January 20, 2006)
7am-Reba: "Don't Mess with Taxes" (S5E13, OAD: January 27, 2006)
7:30am-Reba: "The Goodbye Guy" (S5E14, OAD: February 3, 2006)
8am-A Winter Princess (OAD: January 18, 2019)
10am-Love in Paradise (OAD: January 2, 2016)
12pm-One Winter Weekend (OAD: January 20, 2018)
2pm-Two for the Win (OAD: January 16, 2021)
4pm-Baby, It's Cold Inside (OAD: May 8, 2021)
6pm-Frozen in Love (OAD: January 13, 2018)
8pm-Winter in Vail (OAD: January 4, 2020)
10pm-The Birthday Wish (OAD: January 21, 2017)
12am-The Golden Girls: "One Flew Out of the Cuckoo's Nest (Part 1)" (S7E25, OAD: May 9, 1992)
12:30am-The Golden Girls: "One Flew Out of the Cuckoo's Nest (Part 2)" (S7E26, OAD: May 9, 1992)
1am-The Golden Girls: "The Engagement" (S1E1, OAD: September 14, 1985)
1:30am-The Golden Girls: "Guess Who's Coming to the Wedding?" (S1E2, OAD: September 21, 1985)
2am-The Waltons: "The Chicken Thief" (S2E6, OAD: October 18, 1973)
3am-The Waltons: "The Prize" (S2E27, OAD: October 25, 1973)
4am-The Waltons: "The Braggart" (S2E8, OAD: November 1, 1973)

Hallmark Mystery-

6am: Matlock-"The Hunting Party (Part 1)" (S4E1, OAD: September 19, 1989)
7am: Matlock-"The Hunting Party (Part 2)" (S4E2, OAD: September 19, 1989)
8am: Matlock-"The Good Boy" (S4E3, OAD: September 26, 1989)
9am: Matlock-"The Best Seller" (S4E4, OAD: October 10, 1989)
10am: Matlock-"The Ex" (S4E5, OAD: October 17, 1989)
11am: Matlock-"The Clown" (S4E6, OAD: October 24, 1989)
12pm: Matlock-"The Star" (S4E7, OAD: October 31, 1989)
1pm: Matlock-"The Con Man" (S4E8, OAD: November 7, 1989)
2pm: Matlock-"The Prisoner: Part 1" (S4E9, OAD: November 14, 1989)
3pm: Matlock-"The Prisoner: Part 2" (S4E10, OAD: November 21, 1989)
4pm: Matlock-"The Fugitive" (S4E11, OAD: November 28, 1989)
5pm: Matlock-"The Buddies" (S4E12, OAD: December 12, 1989)
6pm: Matlock-"The Scrooge" (S4E13, OAD: December 19, 1989)
7pm: Matlock-"The Witness" (S4E14, OAD: January 2, 1990)
8pm: Matlock-"The Student" (S4E15, OAD: January 9, 1990)
9pm: Matlock-"The Talk Show" (S4E16, OAD: January 16, 1990)
10pm: Murder, She Wrote-"Incident in Lot 7" (S8E13, OAD: January 19, 1992)
11pm: Murder, She Wrote-"The Monte Carlo Murders" (S8E14, OAD: February 2, 1992)
12am: Murder, She Wrote-"Tinker, Tailor, Liar, Thief" (S8E15, OAD: March 1, 1992)
1am: Murder, She Wrote-"Ever After" (S8E16, OAD: March 8, 1992)
2am: Murder, She Wrote-"To the Last Will I Grapple with Thee" (S8E17, OAD: March 15, 1992)
3am: Murder, She Wrote-"Programmed for Murder" (S8E18, OAD: April 5, 1992)
4am: Murder, She Wrote-"Day of the Dead" (S8E19, OAD: April 26, 1992)
5am: Murder, She Wrote-"Angel of Death" (S8E20, OAD: May 3, 1992)

Hallmark Family-

7am: Heartland-"The Family Tree" (S8E8, OAD: November 23, 2014)
8am: Heartland-"The Pike River Cull" (S8E9, OAD: December 7, 2014)
9am: Heartland-"The Heart of a River" (S8E10, OAD: January 11, 2015)
10am: So You Said Yes (OAD: February 7, 2015)
12pm: My Boyfriends' Dogs (OAD: October 18, 2014)
2pm: Like Cats & Dogs (OAD: April 15, 2017)
4pm: Love at First Bark (OAD: April 1, 2017)
6pm: When Calls the Heart-"Anything for Love" (S11E12, OAD: June 23, 2024)
7pm: When Calls the Heart-"The Mountie Way" (S12E1, OAD: January 5, 2025)
8pm: When Calls the Heart-"You Get What You Give" (S12E2, OAD: January 12, 2025)
9pm: When Calls the Heart-"All That Glitters" (S12E3, OAD: January 19, 2025)
10pm: Heartland-"The Family Tree" (S8E8, OAD: November 23, 2014)
11pm: Heartland-"The Pike River Cull" (S8E9, OAD: December 7, 2014)
12am: Heartland-"The Heart of a River" (S8E10, OAD: January 11, 2015)
1am: Highway to Heaven-"Another Kind of War, Another Kind of Peace" (S3E4, OAD: October 15, 1986)
2am: Highway to Heaven-"That's Our Dad (S3E5, OAD: October 29, 1986)
3am: Highway to Heaven-"Love at Second Sight" (S3E6, OAD: November 5, 1986)
4am: Little House on the Prairie-"The Enchanted Cottage" (S5E21, OAD: February 26, 1979)
5am: Little House on the Prairie-"Someone Please Love Me" (S5E22, OAD: March 5, 1979)
6am: Little House on the Prairie-"Mortal Mission" (S5E23, OAD: March 12, 1979)