Official Stardew Valley Character Zodiac Signs:

🌸 Spring
Kent: Spring 4 (Pisces)
Lewis: Spring 7 (Pisces)
Vincent: Spring 10 (Pisces, w/ Aries cusp traits)
Haley: Spring 14 (Aries)
Pam: Spring 18 (Aries)
Shane: Spring 20 (Taurus)
Pierre: Spring 26 (Taurus)
Emily: Spring 27 (Taurus)

☀️** Summe**r
Jas: Summer 4 (Gemini)
Gus: Summer 8 (Gemini)
Maru: Summer 10 (Gemini, w/ Cancer cusp traits)
Alex: Summer 13 (Cancer)
Sam: Summer 17 (Cancer)
Demetrius: Summer 19 (Leo, w/ Cancer cusp traits)
Dwarf: Summer 22 (Leo)
Willy: Summer 24 (Leo)
Leo: Summer 26 (Leo)

🍂 Fall
Penny: Fall 2 (Virgo)
Elliott: Fall 5 (Virgo)
Jodi: Fall 11 (Libra)
Abigail: Fall 13 (Libra)
Sandy: Fall 15 (Libra)
Marnie: Fall 18 (Libra)
Robin: Fall 21 (Scorpio)
George: Fall 24 (Scorpio)

❄️** Winte**r
Krobus: Winter 1 (Scorpio, w/ Sagittarius cusp traits)
Linus: Winter 3 (Sagittarius)
Caroline: Winter 7 (Sagittarius)
Sebastian: Winter 10 (Capricorn, w/ Sagittarius cusp traits)
Harvey: Winter 14 (Capricorn)
Wizard: Winter 17 (Capricorn)
Evelyn: Winter 20 (Aquarius)
Leah: Winter 23 (Aquarius)
Clint: Winter 26 (Aquarius)

First, I divided the zodiacs into their corresponding seasons. For those on the cusp (10th, 19th), I did it based off of personality. The 1st and 28th are kind of iffy as well, but luckily only Krobus was one of those.

There are 8 full days belonging to each sign. The 1st, 10th, 19th, and 28th are all treated as cusp days.

One might say, why is (what is essentially) Christmas during Aquarius’ time? Well, one would also have to face the fact that Winter doesn’t just end after Christmas. If the Stardew holiday Feast of the Winter Star was translated to our world, it would likely be mid to late February.

Everything else is self explanatory. Seasons are divided evenly. Aries is not the start of spring because seasons as we think of them (weather and ecological changes) do not fully correspond to the solstices (surprise, a good portion of spring tends to be cold). Gemini not being summer doesn’t fit, and neither does Virgo not being fall or Sagittarius not being winter.