Call it Shamrock Shake madness.

It’s Shamrock Shake season, and this year McDonald’s is offering four new flavors of the mint-infused classic.

Starting this week, Southern California McDonald’s restaurants are offering the following flavors: Shamrock Shake, a Shamrock Chocolate Chip Frappé, a Chocolate Shamrock Shake, a Shamrock Hot Chocolate and a Shamrock Mocha.

The shakes are available through March 24. McDonald’s representatives said customers can find special deals on the chain’s app between Feb. 20 and March 10. From March 11 through March 17, 25 cents from each Shamrock Shake will benefit the Southern California Ronald McDonald House Charities.

McDonald’s is pushing its beverage lineup lately.

Earlier this year, the chain began selling coffee for $1. The deal, available in stores through April, applies to any size cup. The McCafe promotion also includes a small specialty drink, such as a latte, for $2.

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