Best Time to Send Email in Klaviyo: What the Data Says (And How to Find Yours)

The best time to send email in Klaviyo is whenever your specific audience is most likely to open, click, and buy. That sounds like a non-answer, but it's the only honest one. Every blog post that tells you "Tuesday at 10 AM" without qualification is oversimplifying a decision that directly affects your revenue per send. What we can do is look at what the benchmark data actually says, understand why those numbers only tell part of the story, and then walk through the Klaviyo tools that let you find the send time that works for your store.

What the Benchmark Data Says About Send Days

Klaviyo's product analytics team analyzed thousands of ecommerce email campaigns and found consistent patterns across verticals. The short version: mid-week sends outperform weekends across nearly every ecommerce category.

For open rates, Tuesday consistently comes out on top. Klaviyo's data shows that apparel and accessories brands see their highest open rates on Tuesday (11.17%), health and beauty brands peak on Tuesday (12.05%), and food and beverage brands also hit their best opens on Tuesday (13.67%). Wednesday and Thursday follow closely behind in most verticals.

But here's where it gets interesting. Open rates and revenue don't always peak on the same day. Klaviyo's analysis found that while Tuesday wins for opens, Thursday tends to generate the highest revenue per recipient. Third-party analyses of the same data confirm this pattern, with Thursday producing roughly 33% more revenue per recipient than Tuesday in some datasets.

Why the gap? One theory is that subscribers are more willing to browse emails early in the week but need a few days before they're ready to purchase. By Thursday, they've had time to consider, and a well-timed campaign can push them over the edge. Whatever the cause, it means choosing your send day depends on what you're optimizing for. If you're focused on building engagement and keeping open rates healthy for deliverability, Tuesday or Wednesday makes sense. If you're running a promotional campaign where placed orders matter most, Thursday deserves serious consideration.

Weekend sends are a different story. Saturday typically shows the lowest engagement across most ecommerce verticals. Sunday can occasionally surprise with decent open rates (likely because fewer brands are sending, so there's less inbox competition), but order rates remain lower than weekday sends for most Shopify stores.

Best Time of Day to Send Klaviyo Campaigns

The day matters, but so does the hour. And the data here is less conclusive than most articles suggest.

The conventional wisdom points to late morning, roughly 10 AM to 12 PM in the recipient's local time zone. This tracks with the idea that ecommerce shoppers (mostly B2C consumers) check email after settling into their day but before the afternoon slump hits. Multiple benchmark reports from Klaviyo, GetResponse, and Moosend support the 8 AM to 11 AM window as producing the strongest open rates.

However, Klaviyo's own data reveals something that challenges the "morning is best" assumption. According to their analysis, there isn't a dramatic difference in open rate, click rate, or revenue between AM and PM sends. Emails sent at midnight (12 AM) in the recipient's local time actually showed a 7% higher open rate and 66% higher revenue per recipient compared to the average. The logic: those emails are sitting at the top of the inbox when subscribers check their phones first thing in the morning.

That midnight strategy comes with risk, though. Sending at unconventional hours can feel intrusive to some subscribers, and if your audience spans multiple time zones without clean timezone data in Klaviyo, you could end up hitting people's inboxes at 3 AM their time. More on timezone handling shortly.

The practical takeaway for most Shopify stores sending email campaigns is to start with a late-morning send (around 10 AM in your primary audience's timezone), then test from there. The "right" hour matters less than consistently testing to find your audience's sweet spot.

Why Generic Benchmarks Only Get You So Far

Here's the problem with all the data above: it's averaged across thousands of brands, industries, and audience types. Your store's optimal send time depends on factors that no benchmark report can account for.

Your audience's daily routine matters more than industry averages. A store selling baby products might have an audience of parents who only check personal email after 8 PM when the kids are in bed. A brand targeting fitness enthusiasts might see peak engagement at 6 AM when people are planning their morning workout. A luxury fashion brand's VIP segment might behave completely differently from their general subscriber list.

Your sending cadence affects timing. If you send two campaigns per week, those sends interact with each other. Sending Tuesday and Thursday at the same time might work, but it might also train subscribers to expect (and ignore) emails at that exact slot. Varying send times across your weekly calendar can sometimes improve overall engagement.

Seasonality shifts everything. During BFCM, the "rules" about best send times go out the window. Engagement patterns change dramatically during holiday periods, back-to-school seasons, and even around daylight saving time changes. A send time that works in March might underperform in November.

Timezone distribution in your list is critical. If 60% of your subscribers are on the East Coast and 25% are on the West Coast, a 10 AM ET send means your West Coast subscribers get the email at 7 AM. Klaviyo lets you send at the recipient's local timezone (more on this below), but you need clean timezone data for that to work properly. If Klaviyo doesn't know a subscriber's timezone, it defaults to your account's timezone setting.

This is why the real answer to "when should I send" isn't a specific time. It's a testing framework. And Klaviyo gives you three distinct ways to build one.

Method 1: Manual A/B Testing for Send Times

If your list has fewer than 12,000 active profiles (or if you just want granular control), A/B testing send times manually is where to start.

How to Set It Up

Create a campaign, click "Create A/B Test," then switch to testing send times instead of content. Klaviyo creates two or more variations of the same email, each scheduled at a different time. Content stays identical, so you're isolating the timing variable. Set distribution to 50/50 and choose open rate as your winning metric.

What to Test First

Start broad: 10 AM vs. 6 PM in your primary timezone. This tells you if your audience skews morning or evening. Once you know that, narrow down within the winning window (9 AM vs. 11 AM if morning won). Always test the same day of week across both variations, and keep subject lines, content, and segments identical.

Klaviyo will indicate whether results are statistically significant. For small lists (under 5,000), run the same test across multiple campaigns to build confidence before declaring a winner.

Method 2: Smart Send Time (12,000+ Profiles)

For brands with at least 12,000 active profiles, Klaviyo's Smart Send Time takes a more systematic approach. Instead of guessing which times to test, Smart Send Time runs a structured experiment across a full 24-hour window.

How It Works

Smart Send Time operates in phases. The exploratory phase sends your campaign across all 24 hours, randomly assigning each recipient a send time in their local timezone. After enough data is collected (which may require multiple sends), Klaviyo identifies the top-performing hour and moves to the focused phase, where it validates the result by testing a two-hour window on either side. Once validated, you get an optimal send time you can apply to any future campaign with a single click.

Key Details

You can run multiple Smart Send Time tests for different segments. Your newsletter list might peak at a different hour than your VIP segment. Don't run tests during BFCM or major holidays, as atypical behavior will skew results. Re-run a focused send every six months to confirm your optimal time hasn't shifted.

Access results by going to Campaigns, clicking the three-dot menu, and selecting "Smart Send Time report." The page shows open rates by hour, placed order rates by hour, and the expected lift from sending at your optimal time.

Method 3: Personalized Send Time (Klaviyo's Newest Feature)

In early 2026, Klaviyo launched Personalized Send Time, which takes optimization a step further. While Smart Send Time finds one optimal time for your entire audience, Personalized Send Time uses AI to determine when each individual recipient is most likely to engage, based on their past behavior and similar profiles.

How It Differs from Smart Send Time

Smart Send Time finds one optimal hour for your entire audience. Personalized Send Time determines when each individual recipient is most likely to engage based on their behavior and similar profiles. Subscriber A might get the email at 8 AM, Subscriber B at 2 PM, and Subscriber C at 9 PM, all from the same campaign.

Setting It Up

When scheduling a campaign, select a sending window (say, 8 AM to 10 PM) and toggle on Personalized Send Time. Klaviyo's AI picks the best time for each recipient within that window, delivering in their local timezone. A control group is automatically created so you can compare performance directly.

When to Use It (and When Not To)

Use it for non-urgent campaigns: weekly newsletters, product recommendations, educational content, loyalty updates. Don't use it for flash sales or anything requiring simultaneous delivery. Same-day sends aren't supported, so schedule at least one day in advance.

During beta, top-performing campaigns saw a 35% increase in click rates. Shady Rays reported over a 10% lift in placed order rates after testing across 30+ campaigns. Personalized Send Time is available on Marketing Analytics or Advanced KDP plans and works across email, SMS, push, and WhatsApp.

Timezone Handling: A Detail That Makes or Breaks Your Timing

Klaviyo offers two timezone options when scheduling campaigns. Recipient's local timezone delivers at your chosen time in each subscriber's timezone. Specific timezone sends everything at once in a single timezone. Recipient local timezone is almost always better for non-time-sensitive campaigns, but it requires Klaviyo to know each subscriber's timezone. If that data is missing, the email defaults to your account timezone.

Make sure your Shopify integration is passing location data. If you're collecting subscribers through popups and forms, IP-based geolocation usually captures timezone data automatically. Audit your profiles periodically to see how many have this field populated.

A Practical Send Time Testing Plan

Rather than chasing a universal "best time," build a testing calendar.

Weeks 1-2: Establish a baseline. Send campaigns at 10 AM on Tuesday and Thursday. Track open rates, click rates, and revenue per recipient.

Weeks 3-4: Test morning vs. evening. A/B test your Tuesday campaign: 10 AM vs. 7 PM. Keep Thursday at baseline.

Weeks 5-6: Narrow the window. If morning won, test 8 AM vs. 11 AM. If evening won, test 5 PM vs. 8 PM.

Weeks 7-8: Test days. Same time, same content type, different days. See which produces better revenue.

Ongoing: Switch to recipient local timezone and enable Smart Send Time or Personalized Send Time once your list and plan support them.

Across the Shopify stores we manage at CartStrings, brands who commit to structured send time testing typically see a 10-20% lift in open rates compared to their previous default. Over a year of campaigns, the compounding effect on revenue is significant.

Send Time Is Important, But It's Not Everything

Getting your send time right matters. But it's one piece of a much larger puzzle that includes segmentation, content relevance, subject lines, and deliverability. A perfectly timed email with a weak subject line still gets ignored. A great email sent to an unengaged segment still lands in spam.

If you're not sure whether your Klaviyo account is set up to maximize campaign performance across all these dimensions, a Klaviyo audit can pinpoint where the biggest opportunities are hiding. Sometimes the issue isn't when you're sending, it's who you're sending to, or what happens after they open.

Start with the data. Test methodically. Let Klaviyo's tools do the heavy lifting once you have enough subscribers to use them. And remember that your optimal send time today might not be your optimal send time six months from now. Keep testing.

‍