Pi Day, March 14, is the annual celebration of the mathematical constant “pi” (rounded to 3.14) — the ratio of a circle’s circumference to its diameter. But you’re not here for math. The best way to celebrate Pi Day, in our humble opinion, is to tuck into any circular food, such as pie, pizza and quiche.

For pizza lovers, check out our roundup of the best pizza in Sonoma County. For those with a sweet tooth, find our list of the county’s best pies.

With so many great local options, we’ve narrowed down some of the best of Sonoma County’s round delights (as well as some local events) to celebrate Pi Day (or enjoy any day of the year, no math required).

Buttercup Baking pop-ups, Sebastopol

Local baker Jenny Malicki of Buttercup Baking is planning two special Pi Day pop-ups on March 14 in Sebastopol. Malicki will be serving strawberry rhubarb and gluten-free Atlantic Beach (lemon-lime) mini pies on a first come, first served basis starting at 7 a.m. at Retrograde Coffee Roasters. (Recite pi to the first 14 digits to get $1 off.) Then, pop on over to pizza favorite Psychic Pie, where Malicki will be slinging slices (flavors unannounced) from 4 p.m. until sold out.

, 130 S. Main St., Suite 103, Sebastopol, 707-827-8065, retrograderoasters.com; , 980 Gravenstein Highway S., Sebastopol, 707-827-6032, psychicpie.com

Purim Pi Party, Petaluma

Since the Jewish holiday of Purim falls on Pi Day this year, the will host a Purim Pi Party starting at 4:30 p.m., March 14. The family-friendly event will include a mad science show featuring entertaining experiments, a Purim math mystery challenge, dinner, hamentashen and, of course, pie. Come in costume to receive a prize. Tickets are $10 per child and $15 per adult. Sponsorships range from $180-$540. Purchase tickets online.

205 Keller St., Suite 101, Petaluma, 707-559-8585, jewishpetaluma.com/pi

Hazel, Occidental

Our dining editor Heather Irwin has tapped the pies at Hazel as some of her favorite desserts in Sonoma County. “Co-owner Michele Wimborough’s pies are legendary,” she noted, citing such delicious pies as peanut butter, blackberry, Dutch apple and lemon meringue.

3782 Bohemian Highway, Occidental, 707-874-6003, restauranthazel.com

Noble Folk, Healdsburg and Santa Rosa

The Press Democrat food and cooking reporter Jennifer Graue has called the peanut butter mousse pie at Noble Folk “9 inches of decadence, and it is worthy every single, silky bite.” An Oreo cookie crust is filled with peanut butter mousse and topped with fresh whipped cream. Also delectable (and round) is the Moustache-o cookie sandwich — sweet vanilla buttercream between two dark chocolate cookies.

116 Matheson St., Healdsburg, 707-395-4426; 539 Fourth St., Santa Rosa, 707-978-3392, thenoblefolk.com

Petaluma Pie Company, Petaluma

The Petaluma Pie Company has long been a supporter of Pi Day — formerly hosting a “Piku” (pie haiku) contest. While the contest has since ceased, the new owners are still celebrating the day with some of the best pies in town. The maple pumpkin, apple pecan crumble and Elvis (chocolate, banana and peanut butter) pies are favorites.

125 Petaluma Blvd. N., Suite B, Petaluma, 707-766-6743, petalumapiecompany.com

Mom’s Apple Pie, Sebastopol

Nothing says “as American as apple pie” as this classic roadside bakeshop in west county. According to the shop’s Facebook, Pi Day is also the birthday of owner Betty Carr’s youngest son, so supporting them on Friday will be extra special. Go for the traditional double crust apple pie for that slice of Americana.

4550 Gravenstein Highway N., Sebastopol, 707-823-8330, momsapplepieusa.com

Sonoma Pizza Co., Forestville

This west county pizzeria gained much-deserved recognition since opening in 2022, using long-fermented dough for its signature pizzas. From the traditional, Neapolitan-style wood-fired pizzas like the simple Margherita to the wonderfully loaded and umami-laden Funky Fungi, the pies here do not disappoint.

6615 Front St., Forestville, 707-820-1031, sonomapizzaco.com

Slow Co. Pizza, Cotati

Newcomer Slow Co. Pizza also uses a long-fermented dough for its seasonal pizzas, focusing on traditional, locally sourced toppings. The Living on The Veg pizza is topped with seasonal offerings, such as delicata squash and radicchio, while the Pep in Your Step brings the heat with Calabrian chiles and spicy honey — each topped with Estero Gold Reserve cheese.

8197 La Plaza, Cotati, 707-796-5124, slowcopizza.com

L’Oro Di Napoli, Santa Rosa and Petaluma

The beloved, Neapolitan-style pizzeria and trattoria — which recently opened its second location in Petaluma to wide acclaim — features a wood-fired oven imported from Naples, so you know they’re not messing around. Our dining editor “fell in love” with the pistachio pizza, topped with smoked cheese, pistachio pesto, mortadella, provolone cream and basil. The patate e porchetta pizza with roasted pork, potatoes and pecorino cheese is also impressive.

629 Fourth St., Santa Rosa, 707-541-6394; 208 Petaluma Blvd. N., Petaluma, 707-981-7175, lorodinapolica.com

NY Pie, Santa Rosa

If it’s late at night and you have yet to acquire a round treat for Pi Day, fear not, for NY Pie will be slinging slices until 10 p.m. The Longfellow Ave. is a classic, with mozzarella, pepperoni, sausage and artichoke hearts. Or you could be adventurous with the Union Square, topped with mozzarella, garlic, onions and anchovies (not for romantic date nights).

65 Brookwood Ave., Santa Rosa, 707-526-9743, nypie.pizza

Quail & Condor, Healdsburg

There’s a reason this bakery was recognized in The New York Times — all of its baked goods are just that good to deserve national praise. For Pi Day, go for the morning buns, oatmeal cream pies and savory gougères, puff pastries with gruyère, chives and black pepper. 149 Healdsburg Ave., Healdsburg, 707-473-8254, quailandcondor.com

Downtown Bakery & Creamery, Healdsburg

This gem of a bakery in downtown Healdsburg has an assortment of delicious treats, and it just so happens that some of the best are round and perfect for Pi Day. Favorites include the baby fruit galettes, chocolate cream puffs and hot cross buns (a special Easter treat). 308 Center St., Healdsburg, 707-431-2719, downtownbakeryhealdsburg.com

BurtoNZ Bakery, Windsor

This New Zealand-style bakery features savory meat pies to switch up the sweet pie focus on Pi Day. 9076 Brooks Road S., Windsor, 707-687-5455, burtonzbakery.com

Goguette, Santa Rosa

On Friday, this bakery serves coup de coeur: brioche buns filled with dark chocolate and topped with fruit. 59 Montgomery Drive, Santa Rosa, goguettebread.com

Criminal Baking & Catering Co., Santa Rosa

Find sweet pies and savory pot pies, as well as mini bundt cakes and fruit tarts. 808 Donahue St., Santa Rosa, 707-888-3546, criminalbakingcompany.com

Water Street Bistro, Petaluma

Head here for some of the best quiches around, like the classic bacon and swiss or the spinach, goat cheese and red pepper. 100 Petaluma Blvd. N., Petaluma, 707-763-9563, waterstreetbistropetaluma.com

Sweet Pea Bake Shop, Sonoma

Available Friday through Sunday only, find deliciously flakey cronuts, filled or coated in cinnamon sugar. 720 W. Napa St., Sonoma, 707-934-8797, sweetpeabake.shop