The Best Time to Send Marketing Emails (Data-Backed Guide for 2025)

"What's the best time to send marketing emails?" is one of the most-Googled questions in email marketing. It's also one where the answer is genuinely useful — but only once you understand the context behind the data.

Here's what the research shows, what matters more than timing, and how to find the best time for your specific audience.

What the Data Actually Says

Multiple studies across billions of emails show clear patterns. Here's what consistently holds up:

Best days to send:

• Tuesday is the top performer in nearly every study — typically 15–20% higher open rates than the weekly average.
• Wednesday and Thursday consistently come in second and third.
• Monday underperforms because people return to work and clear their inbox. Marketing emails get caught in the Monday purge.
• Friday starts to taper as people wind down for the weekend.
• Saturday and Sunday are a split result. Low volume means less competition, and some audiences (particularly B2C) actually respond well to weekend emails — especially when the topic is personal or lifestyle-oriented.

Best times to send:

• 10:00–11:00 AM in the subscriber's local timezone consistently tops the charts. People have handled the morning rush and are settling into their day.
• 1:00–2:00 PM captures the post-lunch lull — a time when many people reach for their phones.
• 8:00–9:00 AM works well if your audience is early risers or commuters who check email first thing.
• Evening hours (7:00–9:00 PM) perform well for B2C audiences, particularly e-commerce. After dinner, before bed.

The worst times: early morning (before 6 AM), late night (after 10 PM), and during obvious distraction windows like Friday at 5 PM.

Why These Averages Might Not Apply to You

Here's the important caveat that most "best time to send" articles skip: averages are computed from millions of emails across every industry and every type of audience. Your subscribers aren't every type of audience.

Consider the difference:

• A newsletter for night shift nurses has an audience whose "morning" is 7 PM.
• A list for restaurant owners gets the most attention mid-morning, before the lunch rush.
• A B2B software newsletter targeting developers might do best on Wednesday at 10 AM — or Saturday morning when they're relaxed and curious.
• A lifestyle brand newsletter might perform best Sunday evening when subscribers are planning the week.

Industry benchmarks give you a starting point. Your own data tells you the truth.

How to Find Your Optimal Send Time

Step 1: Start with the benchmark. If you have no data, begin with Tuesday at 10 AM. This is statistically the safest default.

Step 2: Send consistently and track opens. After 5–10 campaigns, you'll have a baseline open rate. Note which sends outperformed your average.

Step 3: Run a simple test. Split your list roughly in half. Send the same email (different subject line so you can distinguish responses) at two different times — say, Tuesday 10 AM vs. Thursday 1 PM. The winning time gets used for the next test.

Step 4: Check your email analytics platform. Most modern email platforms can show you what times your subscribers are most active. Flomailr's analytics show per-campaign performance alongside engagement trends so you can see patterns across sends.

Step 5: Segment by timezone if your audience is global. Sending at 10 AM Eastern means 7 AM Pacific and 3 PM in London. If you have meaningful subscriber clusters in multiple timezones, sending timezone-adjusted emails can lift open rates by 10–15%.

Day-of-Week Deep Dive

Tuesday: The data consensus pick. It beats Monday's cluttered inboxes and gets ahead of the midweek drift. Consistent but never exciting — most email marketers default here.

Wednesday: The sleeper pick. Lower volume than Tuesday means less competition in the inbox. Open rates are very close to Tuesday's, and click rates are sometimes higher.

Thursday: Strong performance, especially for promotional emails with a weekend-relevant offer ("plans this weekend?").

Monday: Usually underperforms due to the Monday inbox clear. Exception: newsletters people genuinely look forward to (think curated roundups that kick off the workweek).

Friday: Works well for "lighter" content — weekend reading, lifestyle, entertainment. Fails for heavy business content that requires mental energy.

Weekend: Surprisingly effective for B2C, lifestyle, e-commerce, and hobby-focused lists. Lower send volume means lower competition. If you're e-commerce and running a weekend flash sale, Saturday morning is worth testing.

Time-of-Day Breakdown

6:00–8:00 AM: Captures early risers who check email before the day starts. Works if your content is a quick morning read.

10:00–11:00 AM: The statistical peak. People have cleared their immediate morning tasks and have mental bandwidth. Open rates and click rates tend to peak here.

12:00–1:00 PM: The lunch window. Mixed results — engagement can be high on mobile, but some readers snooze emails to read later and forget.

1:00–2:00 PM: Strong. Post-lunch, people often check email before diving back into work. Good for longer-form content.

4:00–5:00 PM: Starting to fade. People are winding down. Some B2C success here for "after work" type content.

7:00–9:00 PM: Surprisingly strong for B2C and lifestyle brands. Subscribers are relaxed, away from work stress, and browsing on their phones.

After 9:00 PM: Generally avoid. Too late for active engagement, too early for the next morning's first check.

What Matters More Than Timing

After all this, here's the uncomfortable truth: sending day and time are a second-order variable. The bigger drivers of open rate are:

1. Subject line. A mediocre email sent at the perfect time still gets ignored. A compelling subject line at any reasonable time will outperform a boring one at the optimal time.

2. List quality and engagement. Subscribers who trust you and look forward to your emails open them whenever they arrive — Tuesday at 10 AM or Friday at 4 PM. Build that trust by consistently sending useful content.

3. Sender name recognition. "From: Flomailr" gets opened based on reputation, not timing. "From: noreply@someshop.com" struggles regardless of when it arrives.

4. Send frequency. An over-mailed list becomes numb to your sends. An under-mailed list forgets who you are. Consistent frequency trains subscribers to look for your emails.

The research on timing is real and worth using. But if you're spending more time optimizing your send schedule than you are writing better content, you have the priorities backwards.

The Practical Takeaway

If you need a starting point: Tuesday or Wednesday, between 10 AM and 11 AM in your audience's primary timezone.

From there, send consistently and watch your analytics. After a dozen sends, the data will show you what your audience prefers. Their behavior is the only opinion that matters.

Set your default send time, commit to it for two months, and focus the rest of your energy on writing emails worth opening — regardless of what time they arrive.