PHILADELPHIA (CBS) – The first day of spring means free water ice from Rita’s.

From noon to 9 p.m. on Thursday, almost all Rita’s locations will be offering free orders of the sweet treat, gratis.

Guests can also use the hashtag #RitasFirstDayofSpring and upload photos of their free ice to Facebook, Twitter or Instagram after following or ‘liking’ Rita’s on social media. Those using the hashtag before midnight Thursday will have the chance to win prizes.

Rita’s has been offering the freebie for more than 20 years as a way to celebrate the start of spring.

To find a location near you, click here.

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