{"id":1375,"date":"2026-02-01T10:00:00","date_gmt":"2026-02-01T09:00:00","guid":{"rendered":"https:\/\/newcraft.dev\/posts\/how-to-set-up-a-birthday-flow-in-klaviyo-shopify-guide\/"},"modified":"2026-02-28T07:13:27","modified_gmt":"2026-02-28T06:13:27","slug":"how-to-set-up-a-birthday-flow-in-klaviyo-shopify-guide","status":"publish","type":"marketing-post","link":"https:\/\/newcraft.dev\/nl\/posts\/how-to-set-up-a-birthday-flow-in-klaviyo-shopify-guide\/","title":{"rendered":"How to Set Up a Birthday Flow in Klaviyo (Shopify Guide)"},"content":{"rendered":"\n

Setting up a birthday flow in Klaviyo for your Shopify store is possible, but it requires more steps than most tutorials suggest. You need to collect birthday data, store it as a custom property in Klaviyo, build a date-based trigger flow, and manage edge cases like leap year birthdays. This guide walks you through the complete setup. If you want a faster alternative, the Happy Birthday app for Shopify<\/a> handles all of this without needing Klaviyo at all.<\/p>\n\n\n

TL;DR: Klaviyo can send birthday emails, but collecting birthdays? That’s on you. Here’s how to set it up \u2013 and a shortcut if you don’t want the hassle.<\/strong><\/p>\n

Klaviyo is great for email marketing. Abandoned carts, welcome series, post-purchase flows \u2013 it handles all of that beautifully. So when merchants want to add birthday emails, Klaviyo seems like the obvious choice. But there’s a catch that trips up almost everyone. (Just want birthday emails working today? Skip to the Happy Birthday App for Shopify<\/a>.)<\/p>\n

The Part Nobody Mentions<\/h2>\n

Here’s what Klaviyo’s own docs say: “You must collect birthdays as a profile property on your customers’ profiles.”<\/p>\n

Translation: Klaviyo doesn’t collect birthdays. You need to figure that out yourself. Klaviyo just sends the email once you somehow have the data.<\/p>\n

Three ways to get birthday data into Klaviyo:<\/p>\n

    \n
  1. Add a date field to your popup<\/strong> \u2013 Except now your popup asks for email AND birthday, which tanks conversion<\/li>\n
  2. Import a CSV<\/strong> \u2013 Great if you already have birthdays somewhere (you probably don’t)<\/li>\n
  3. Connect an app that collects them<\/strong> \u2013 This is what most merchants end up doing<\/li>\n<\/ol>\n

    Why Popups Don’t Work for Birthdays<\/h2>\n

    Think about this from your customer’s view. They just landed on your site. A popup appears asking for their email \u2013 fine, that’s normal. But also their birthday? Weird. Feels invasive. Many people just close the whole thing.<\/p>\n

    Now compare that to asking on the thank you page after checkout<\/a>. They just bought something. They already trust you with their credit card. A quick “want a birthday surprise next year?” feels natural, not creepy. Way higher conversion.<\/p>\n

    Actually Building the Klaviyo Flow<\/h2>\n

    Let’s say you’ve somehow got birthday data in Klaviyo. Here’s what to do:<\/p>\n

      \n
    1. Go to Flows, click “Create Flow”<\/li>\n
    2. Pick “Date Property” as your trigger<\/li>\n
    3. Select whichever field stores birthdays (needs at least one profile with data or it won’t show up \u2013 fun surprise there)<\/li>\n
    4. Set timing: day of birthday or a few days before, morning delivery, recipient’s timezone<\/li>\n
    5. Turn on yearly repeat (otherwise it sends once and never again)<\/li>\n
    6. Design your email, add a discount code<\/li>\n
    7. Go live<\/li>\n<\/ol>\n

      Not rocket science, but definitely more steps than you’d expect for something this common.<\/p>\n

      The Date Format Headache<\/h2>\n

      Klaviyo needs dates in specific formats \u2013 YYYY-MM-DD or MM\/DD\/YYYY. Import a spreadsheet with “March 15” or “15\/03\/1990” and your flow just… won’t trigger. No error message, just silence.<\/p>\n

      This bites people constantly. They set everything up, wait for a birthday to roll around, nothing happens. Then they discover their dates are wrong and have to re-import everything.<\/p>\n

      Discount Code Complications<\/h2>\n

      You’ll want unique codes per customer<\/a> so people can’t share them on coupon sites. Klaviyo can do dynamic codes, but you need to set it up in Shopify first, then wire it to Klaviyo. Another layer of fiddling.<\/p>\n

      The Easier Path<\/h2>\n

      Look, Klaviyo is fantastic if you’re already deep into it. But for birthday emails specifically, you’re bolting complexity onto a platform that doesn’t really want to do this job.<\/p>\n

      The Happy Birthday App<\/a> was built for exactly this:<\/p>\n