In 2019, LEGO released 10 Seasonal sets across 5 subthemes, all of these sets have been retired. Subthemes for that year included Birthday, Chinese New Year, Chinese Traditional Festivals, Christmas, and Easter. For that year, the total price of all retail sets cost $248, today those sets are valued around $678, a growth of 173%.
Most valuable 2019 LEGO Seasonal set
80101 Chinese New Year's Eve Dinner $225.00
Highest growth 2019 Seasonal set
40186 Year of the Pig +200.30%
Largest 2019 LEGO Seasonal set
80103 Dragon Boat Race 643 pieces
Most owned 2019 Seasonal set
40338 Christmas Tree
10 sets

40186 Year of the Pig

Theme / Subtheme Seasonal / Chinese New Year
Year 2019
Pieces 152
Availability Retired
40186 LEGO Year of the Pig
Retail $9.99
Value $30.00
Growth  +200.3%
Annual growth 16.0%

40337 Gingerbread House

Theme / Subtheme Seasonal / Christmas
Year 2019
Pieces 499
Availability Retired
40337 LEGO Christmas Gingerbread House
promotional
Value $37.00
Annual growth 1.0%

40338 Christmas Tree

Theme / Subtheme Seasonal / Christmas
Year 2019
Pieces 392
Availability Retired
40338 LEGO Christmas Tree
promotional
Value $49.85
Annual growth 10.8%

80101 Chinese New Year's Eve Dinner

Theme / Subtheme Seasonal / Chinese Traditional Festivals
Year 2019
Pieces / Minifigs 615 / 6
Availability Retired
80101 LEGO Chinese Traditional Festivals Chinese New Year's Eve Dinner
Retail $99.99
Value $225.00
Growth  +125.0%
Annual growth 9.9%

80102 Dragon Dance

Theme / Subtheme Seasonal / Chinese Traditional Festivals
Year 2019
Pieces / Minifigs 622 / 5
Availability Retired
80102 LEGO Chinese Traditional Festivals Dragon Dance
Retail $69.99
Value $202.02
Growth  +188.6%
Annual growth 10.7%

80103 Dragon Boat Race

Theme / Subtheme Seasonal / Chinese Traditional Festivals
Year 2019
Pieces / Minifigs 643 / 15
Availability Retired
80103 LEGO Chinese Traditional Festivals Dragon Boat Race
Retail $49.99
Value $56.43
Growth  +12.9%
Annual growth 2.8%

853906 Birthday Card

Theme / Subtheme Seasonal / Birthday
Year 2019
Pieces / Minifigs 40 / 1
Availability Retired
853906 LEGO Birthday Card
Retail $9.99
Value $14.99
Growth  +50.1%
Annual growth 3.1%

853907 LEGO Toy Soldier Ornament

Theme / Subtheme Seasonal / Christmas
Year 2019
Pieces 43
Availability Retired
853907 Christmas LEGO Toy Soldier Ornament
Retail $7.99
Value $17.56
Growth  +119.8%
Annual growth 7.7%

853958 Chicken Skater Pod

Theme / Subtheme Seasonal / Easter
Year 2019
Pieces / Minifigs 36 / 1
Availability Retired
853958 LEGO Easter Chicken Skater Pod
promotional
Value $9.65
Annual growth 16.1%

Easter Chick

Theme / Subtheme Seasonal / Easter
Year 2019
Pieces 30
Availability Retired
LEGO Easter Chick
promotional
Value $35.19
Annual growth 20.2%