The short answer: there isn't one best time to send email newsletter issues for every list. The large datasets keep landing on weekday mornings, roughly 9 to 11 a.m. in your reader's time zone, so that's where I start. But those studies lean on open rates, and Apple Mail now records a lot of opens that never happened. So treat the morning window as your first guess. Then run a simple two-time test on your own list and judge it by clicks, replies, and orders. I'm John Alewine, and this guide shows you how.
Key takeaways
- Start with a weekday morning. Omnisend's 2026 data and Mailchimp's send time data both point to mid-morning in the recipient's time zone as the safest first guess.
- The day matters less than people think. In Mailchimp's data, Monday through Friday came out close as subscribers' best day, and GetResponse saw engagement hold steady across the workweek.
- Opens aren't a reliable timing signal anymore. Apple Mail Privacy Protection can load your email in the background when it arrives, so an "open" may only mean the email was delivered.
- Test on your own list. Send the same email to two random halves at two different times, repeat over several sends, and pick the winner by clicks, replies, or coded orders.
- Automatic send time features have limits. Some need paid plans or large lists, like Klaviyo's 12,000 profile minimum for Smart Send Time, so a plain A/B test is often the better tool for a small Kansas City list.
What "best send time" is (and what it is not)
When I talk about the best send time, I mean the day and hour when your own readers are most likely to see your email and act on it. For a newsletter, acting might mean clicking through to a story, replying with a question, booking a service call, or using an offer code. It's a habit of your audience, and you can only measure it on your audience.
A study's best time is a different thing. It's an average across thousands of senders and millions of readers. Most of those senders aren't a Kansas City plumber or a family dental office. Omnisend's dataset, for example, comes from its 2026 send time research on about 26 billion emails sent through its platform. That's useful context, but it isn't your list.
The best send time is also not a fix for a weak email. If the letter has nothing worth reading, moving it from Tuesday to Thursday won't save it. Timing matters most once the basics are in place: a clean list, a recognizable From name, and one clear point per email. If you're not there yet, start with my guides on building the email list and owner-voice emails.
And it's not permanent. Customer routines shift with the seasons. A contractor's list in storm season doesn't behave like it does in a quiet January. Treat your send time as a working answer you check now and then, not a rule you set once and forget.
What the big email studies actually found
I only included studies I could open and read on the publisher's own site. Here's what each one says, plus the caveat I'd keep in mind.
| Source | What they looked at | What they reported | Caveat |
|---|---|---|---|
| Omnisend (2026 research) | About 26 billion emails | Tuesday led for opens and clicks. Friday led for conversions. 9 to 11 a.m. was the best window for opens. Friday at 7 a.m. was the top single slot for conversions. | Drawn from an ecommerce email platform. Opens include Apple Mail preloads. |
| GetResponse (2024 Benchmarks) | GetResponse customer campaigns | Two strong windows: 4 to 6 a.m. and 5 to 7 p.m. Engagement stayed stable across the workweek. Tuesday and Thursday had the best click-through rates. Senders at other times, such as 10 a.m., saw higher click-to-open rates. | Data from one platform's customers. Open-based figures include Apple Mail preloads. |
| Mailchimp (Send Time Optimization data) | Distribution of optimal send times across its system | The typical optimal time was 10 a.m. in the recipient's own time zone. Monday through Friday were all similar. Sunday was the optimal day for the fewest subscribers. | Shows where most people's best time falls, not a promise for any one list. |
Look at what they agree on: weekdays, and some form of mid-morning. Now look at where they differ. GetResponse points to very early morning and early evening, and Omnisend gets a different answer depending on whether you want opens, clicks, or sales. That's the real lesson. The "best" time depends on what you count, and these studies don't all count the same thing.
Why open-rate timing data is distorted by Apple Mail Privacy Protection
Most send time advice was built on open rates. An open is recorded when a tiny tracking image in the email loads. Apple changed what that signal means.
According to Apple, Mail Privacy Protection prevents senders from seeing if you've opened the email they sent. On a Mac with Protect Mail Activity on, remote content is privately downloaded in the background when you receive a message, not when you view it.
Mailchimp explains the result plainly. If a contact uses this feature, Apple Mail preloads pixels even if your contact hasn't opened the email, which inflates open rates. Mailchimp also warns that A/B tests judged on open rates may not be accurate, and it notes that clicks and purchases aren't affected by Apple MPP.
Here's why that matters for timing. If an email gets marked "opened" the moment it lands in an Apple Mail inbox, then an open-based timing study partly measures when emails were delivered, not when people read them. Your 6 a.m. send can look great even if nobody looked at it until lunch.
Clicks aren't perfect either. Mailchimp says bot activity can falsely inflate open and click metrics, and it offers bot filtering. Still, a click, a reply, or an order with your code on it is much closer to a real person acting. I go deeper on this in my guide to open rates.
Best day vs best time: which matters more?
If you searched for the best day to send email newsletter issues, here's my honest read: the day matters less than the hour, and both matter less than the content.
- Day: Mailchimp's data shows no single day winning outright, with weekdays close together. GetResponse found average engagement stable across the entire workweek. Omnisend did see Tuesday lead for opens and Friday lead for conversions.
- Time: This is where the studies split, and where your test will teach you the most. Morning for visibility and late afternoon for action are the two windows worth comparing first.
- Consistency: Pick a day you can actually keep. If your approver is on job sites Monday and Tuesday, a Thursday newsletter that goes out on time beats a Tuesday one that slips. My guide on how often to email covers cadence.
B2B vs B2C timing
Who reads your email changes when they read it. Mailchimp's send time data found that business-related content has fewer subscribers whose best time falls on a weekend. Recreational content has more. The same page notes that weekends tend to be weaker for business emails, while some retail promotions may do well on Saturday mornings.
In practice, I think about it this way:
- B2B readers (property managers, office managers, other business owners) read inside their workday. Test early morning before meetings against mid-morning.
- B2C readers (homeowners, patients, shoppers) read whenever they have a minute. Test a weekday morning against an evening or a weekend morning.
- Mixed lists (a contractor with both homeowners and commercial accounts) should be split into two segments if the tool allows it, then tested separately.
Starting send windows by business type (starting points to test, not facts)
This table is my judgment, built on the study patterns above. None of it is local data, and none of it is a promise. Use the first column as your control and the second as your challenger in the test below. Times are Central Time for a mostly local Kansas City list.
| Business type | Starting window to test | Challenger window to test | Why I'd start here |
|---|---|---|---|
| Home services contractor (HVAC, roofing, remodeling) | Tuesday or Wednesday, 9 to 11 a.m. | Thursday, 5 to 7 p.m. | Mornings match the open window in the big datasets. Evenings catch homeowners after work, when they can talk over a project. |
| Dental or medical clinic, med spa | Tuesday or Thursday, around 10 a.m. | Saturday morning | Mid-morning is the common optimal time. A weekend morning tests whether patients plan appointments on their own time. |
| Local retail or specialty shop | Tuesday, around 10 a.m. | Friday early morning or Saturday morning | Omnisend saw Friday lead for conversions, and Mailchimp notes some retail promos do well on Saturday mornings. |
| Restaurant, venue, or events | Thursday morning | Wednesday late afternoon | People need time to make weekend plans. Both options give them a couple of days. |
| B2B services (accounting, commercial cleaning, IT) | Tuesday to Thursday, around 10 a.m. | Same days, 6 to 7 a.m. | Business readers read during the workday. GetResponse found an early morning window worth testing. |
Time zones, Central Time, and daylight saving
Most Kansas City local lists are mostly Central Time, which keeps things simple. Two settings still matter.
- Set your account to your local time zone. Mailchimp recommends using your local time zone rather than an absolute one like GMT so scheduled emails don't go out at odd hours after seasonal time changes.
- Use recipient time zone sending if you have readers elsewhere. Mailchimp's Timewarp delivers based on each recipient's time zone. It has to be scheduled at least 24 hours ahead, and contacts without location data get your account's default time zone. GetResponse offers a similar feature called Time Travel.
Send time optimization features: what they do and their limits
Several email tools will pick a send time for you. These features can help, but read the fine print before you count on one.
| Tool and feature | What it does | Limits from the vendor's own docs |
|---|---|---|
| Mailchimp Send Time Optimization | Finds an ideal time within 24 hours of your send date | Paid feature that looks at contacts' click activity history. Not available in automated emails. Send date must be at least 48 hours out. |
| Klaviyo Smart Send Time | Runs exploratory, focused, and optimal sends to find your list's best hour | Only for accounts with at least 12,000 active profiles and campaigns with at least 12,000 recipients. |
| Klaviyo Personalized Send Time | Picks a time per recipient, optimizing for opens, clicks, and placed order rate | Requires the Marketing Analytics or Advanced KDP packages. Campaigns must be scheduled at least a day ahead. Not available for flows yet. |
| Brevo Send at best time | Picks a time per contact, and all recipients get the email within 24 hours | Not available for A/B test campaigns. Only on Standard, Professional, and Enterprise plans. |
| GetResponse Perfect Timing | Adjusts send time based on subscribers' behavioral data | Check your plan's feature list before relying on it. |
Two things to notice. First, a lot of these features run on engagement data, and some of that data includes opens, which Apple has muddied. Second, if each reader gets the email at a different time, you can't send a time-sensitive offer. For a "this Saturday only" email, I'd pick a fixed time.
How to run a send time A/B test on a small business list
This is the part none of the studies can do for you. It works in nearly any email tool. Mailchimp even has send time as a built-in A/B test variable with up to three variations.
- Pick two times. Take your control and challenger from the table above, for example Tuesday 10 a.m. vs Thursday 6 p.m. Don't test five times at once on a small list.
- Choose your metric before you send. Use clicks, replies, booked calls, or orders with the email's unique code. Don't use opens. In Mailchimp you can choose the winner manually from the report instead of letting it pick by open rate.
- Split the list at random. Each half should look alike. Don't split by signup date, town, or customer type, or you'll be testing the audience instead of the clock. In Mailchimp's send time test, the combinations go to all your subscribed contacts at once, because a winner can't be sent at a time that has already passed.
- Keep everything else the same. Same subject line, same content, same From name. Change one thing only.
- Wait a fixed window before scoring. I give it a full week for clicks, replies, and coded orders, since a service customer may sit on an email for days before calling.
- Repeat the same pairing several times. One send can be swung by weather, a holiday, or a single big order. Mailchimp advises that smaller lists run tests longer and focus on clear differences rather than small ones.
- Write down the winner and when you'll retest. Move all sends to the winning time. Recheck once a season, or when your business changes, like a new service line or a busy storm season.
If neither time wins clearly after several sends, that's a useful answer too. It means timing isn't your biggest lever right now. Put your effort into subject lines, the offer, or the list itself.
Common send time mistakes I see
- Calling a winner from opens. After Apple's change, an open-rate winner may just be the time that delivered to more Apple Mail inboxes.
- Testing on one send. One Tuesday that happened to follow a hailstorm tells you about the hail, not about Tuesday.
- Changing two things at once. A new subject line at a new time teaches you nothing about either one.
- Ignoring who approves the email. The best slot doesn't matter if the draft is never approved in time. Match the schedule to the person who signs off.
- Sending at exactly the top of the hour. Klaviyo notes sending may be slightly slower at peak times like on the hour and suggests an off-peak minute, such as 3:04 p.m.
How I put this together
On October 18, 2026, I read the top US search results for "best time to send email newsletter." I noted what they cover and what they leave out, mainly unlinked studies, no mention of Apple Mail Privacy Protection, and no test plan a small business could actually follow. Then I went to primary sources: Apple's support pages, the help centers for Mailchimp, Klaviyo, and Brevo, and the study pages published by Omnisend, GetResponse, and Mailchimp. Every study and help page I cite is linked. I didn't run a new study for this article, and the starting windows table is my judgment, labeled that way.
FAQ
What is the best time to send an email newsletter?
There's no single best time. The big datasets keep pointing to weekday mornings, roughly 9 to 11 a.m. in the reader's time zone, so that's a sensible place to start. Then test it against one other window on your own list.
What is the best day to send an email newsletter?
Tuesday comes out on top for opens and clicks in Omnisend's 2026 data, and Friday comes out on top for conversions. In Mailchimp's send time data, Monday through Friday come out close as subscribers' best day. Pick a weekday you can keep up with, then test a second one.
How does Apple Mail Privacy Protection affect send time data?
Apple Mail can download an email's images in the background when the message arrives, before anyone reads it. Mailchimp says this records opens that may never have happened. So timing studies built on open rates partly measure delivery time, not reading time.
How do I test send times with a small list?
Send the same email to two random halves of your list at two different times. Judge by clicks, replies, or coded orders, not opens. Repeat the same pairing over several sends before you decide.
What time zone should a Kansas City business schedule in?
If almost all of your customers are local, schedule in Central Time and set your email tool's account to your local time zone. Mailchimp recommends that so scheduled emails don't go out at odd hours after daylight saving time changes. If you have readers in other time zones, look for a recipient time zone option like Mailchimp's Timewarp.
How is send time optimization different from A/B testing?
Send time optimization lets the tool choose a time for each person based on past engagement, usually within a 24 hour window. An A/B test compares two or three fixed times you choose. Some optimization features need large lists, so many small businesses will learn more from a plain A/B test.
What should I measure instead of open rate?
Measure clicks, replies, booked calls, and orders that carry the unique code from the email. Mailchimp notes that clicks and purchases aren't affected by Apple Mail Privacy Protection the way opens are. Pick the metric before you send so you aren't choosing a winner after the fact.
Want someone to write and send the emails for you?
I write and send emails for Kansas City businesses that already have customers. The email review looks at your list and your tool and rewrites your last eight subject lines. You leave with written notes, a 90-day send calendar, and a 45-minute call. It doesn't promise a better send time or any particular result, and you keep paying for your own email tool. If you'd rather have me write and send each email, the monthly and weekly plans are listed with their prices. Start with the $747 email review, or compare every option on the pricing page.
A quick fit check before you start: this works for businesses where a monthly marketing retainer is a line item, not a decision. For early stage businesses still building their base, it is too early.