Written by: Jack | Boostero Editorial Team. 10 min read. Last update: September 2026.
Four large studies published in 2026 asked when to post on Instagram, and between them they measured more than fifteen million posts. They agree on the day. They disagree on the hour, and not by a little: the two furthest apart put their best slot thirteen hours from each other. Most articles on this question pick one study and present its hour as the answer. This one explains which half of the question is settled, which half is not, and what to do about each.
At the end there is a section from our own order data, which answers a neighbouring question rather than this one and is labelled as such.
The Short Answer
Post midweek. Wednesday and Thursday outperform every other day in every large study we found, and Friday and Saturday come last in almost all of them. That part you can act on today.
The hour is contested, and the honest range is wide: mid-morning to early evening in your audience's local time, with one credible study pointing at dawn. The next two sections explain why, and the section after that tells you how to replace the range with your own number.
What the Studies Agree On: The Day
Buffer analysed 9.6 million Instagram posts from over 200,000 accounts and ranks Wednesday first, then Thursday, then Tuesday, with Friday and Saturday at the bottom.
Sprout Social analysed close to 2 billion engagements across roughly 307,000 profiles and finds Tuesday and Wednesday strongest, with weekends lowest overall and across almost every industry.
Hootsuite, on over a million posts across 118 countries, ranks Monday, Tuesday and Thursday strongest.
A meta-analysis of nine separate studies found Wednesday in the top position in eight of them. That is as close to settled as this kind of question gets.
What They Disagree On: The Hour
Here the same studies split, and the split is the useful part.
- Buffer names Thursday 9am, Wednesday 12pm and Wednesday 6pm as its top three slots, and finds evenings beat mornings on most days.
- Sprout Social points to midday through evening, roughly noon to 7pm.
- Later, on more than six million posts including 975,000 Reels, points much earlier: around 5am, and for Reels specifically, midnight to 6am on Mondays.
- SocialPilot favours early mornings, 6am to 8am.
Later's 5am and Buffer's 6pm are thirteen hours apart. Both studies measured millions of real posts. Neither is wrong.
Why Four Careful Studies Give Four Hours
The disagreement is not noise. It comes from three choices each study made differently, and once you see them the hours stop contradicting each other.
- What counts as engagement. Later and Buffer measure engagement rate per post. Sprout counts total engagements. A post at 5am reaches a small, attentive audience with almost no competition in the feed, which produces a high rate on a low total. A post at 6pm reaches more people and competes with more posts, which produces a high total on a lower rate. Which one is "best" depends on which one you are optimising, and the studies chose differently.
- Whose posts. Buffer samples posts scheduled through Buffer. Sprout samples its customers' profiles, which lean toward brands and agencies. Later samples its own users, who skew toward creators. Brands post in office hours and creators do not, so each dataset finds peaks partly where its own users already post.
- Which clock. Buffer and Later report in the audience's local time. Sprout normalises across global profiles. Two studies can report the same underlying behaviour in different hours if one has converted time zones and the other has not.
So the day is settled because all three choices point the same way on it. The hour is not because they pull apart. An aggregate hour is a starting point for your test, not a number to schedule around.
How to Find Your Own Hour
Instagram already has the answer for your account, and it is more reliable than any published average because it measures your followers rather than someone else's.
- Open Instagram Insights, go to Total followers, and read Most active times. It shows the hours and days your followers are on the app.
- Check top locations in the same view. If your audience spans time zones, one posting time cannot serve all of them and you are choosing which group to serve first.
- Pick a slot from your own active-times chart, post there for two weeks with everything else held steady, and compare reach and saves against your previous two weeks. One variable at a time.
- Repeat with a second slot. The gap between your two results tells you how much timing matters for your account, which is the number no study can give you.
What Timing Can and Cannot Do
Timing decides who sees a post in its first hour, and the first hour affects whether Instagram tries it on a wider audience. Buffer's report notes that the algorithm now weights sends per reach, how often a post is forwarded to a friend, as a strong ranking signal, and that signal accumulates fastest when the people most likely to send are online.
What timing cannot do is make a post worth sending. Carousels, in Buffer's data, earn far more engagement than single images regardless of hour. A well-timed post that nobody saves has been shown to more people who scrolled past it. Timing buys the first hour. The content decides what happens in it.
A Different Question: When People Order Engagement, and Whether It Matters
This section is our own data and it answers a neighbouring question. The studies above measure when posts are published. We can measure when engagement is ordered, and whether the time of ordering changes what happens to the order.
The figures come from 543,708 Instagram orders placed between January 2025 and June 2026, after excluding four bulk accounts. That exclusion is large, those four accounts placed most of the Instagram orders in the period, and it is stated here rather than hidden because without it the curve is theirs and not a picture of individual buyers. All times are UTC, because our order records do not carry buyer country. An afternoon peak in UTC across a global customer base is the sum of several local afternoons and evenings, so it describes our order flow rather than any one country's habits.
Orders cluster in the same window as TikTok
Ordering runs 1.75 times higher at its busiest hour than at its quietest, and the block from 13:00 to 22:00 UTC sits above the daily average throughout. That is the same shape we measured for TikTok, to within the noise between one week and the next, and it is worth saying because it means the people ordering Instagram and TikTok engagement are largely the same people on the same schedule, not two audiences.
By day of week the spread is narrow. Tuesday is the heaviest at 15.4 percent and Sunday the lightest at 12.9 percent, a ratio of 1.19.
Delivery does not vary by hour, and that is the finding
For TikTok we found that partial deliveries were several times more common in the busiest hour than in the quietest, which gave a small real edge to ordering off-peak. We ran the same measurement on Instagram expecting the same result.
It is not there. The busiest hour and the quietest hour deliver at the same rate: a ratio of 1.06, with a confidence interval that crosses 1, and 1.02 once the mix of services ordered in each hour is accounted for. By day of week it is 1.09, and 1.02 after the same adjustment.
So on Instagram the time you order makes no measurable difference to whether the order fills. There is no off-peak edge to give you, and we would rather say that than manufacture one. It is the one TikTok finding that does not carry over, and finding that a result does not replicate is as much a result as finding that it does.
What we cannot tell you
We have no retention figures by hour, and no buyer country, so no local-time curve and no US-only cut. The single busiest hour is also not something we would publish: the ten largest remaining accounts still carry nearly half of the orders, and removing them moves the peak by three hours while leaving the window intact. The window is robust. The hour inside it is not, which is a smaller version of exactly what the four public studies ran into.
Putting It Together
Post on Wednesday or Thursday; every large study agrees and you do not need to test that. Start your hour somewhere between late morning and early evening in your audience's local time, because that is where three of the four studies overlap, and treat Later's dawn slot as a legitimate second test rather than an outlier, since it is measuring something real about low competition.
Replace all of that with Instagram Insights the moment you have two weeks of it.
If you use a panel to give a post early momentum, our own numbers say the hour you order does not affect delivery on Instagram, so order when it suits your schedule. The Instagram panel covers likes, followers, views, story views and comments, with paced delivery and public links only.
The TikTok version of this post, with the delivery finding that did apply there, is here. The part of growth no schedule solves is in our guide to seven principles that last.
Frequently Asked Questions
What is the best day to post on Instagram?
Wednesday, with Thursday close behind. Buffer, Sprout Social and Hootsuite all place midweek at the top, a meta-analysis of nine studies found Wednesday first in eight of them, and Friday and Saturday come last in almost every dataset. This is the settled half of the question.
What is the best hour to post on Instagram?
Contested. Buffer says Thursday 9am, Wednesday noon and Wednesday 6pm. Later says around 5am, and midnight to 6am on Mondays for Reels. SocialPilot says 6am to 8am. Sprout says midday to evening. They measure different things on different audiences with different clocks, and the honest answer is a range plus a test on your own account.
Why does one study say 5am and another say 6pm?
Because they measure different things. A post at 5am gets a high engagement rate from a small audience with no competition. A post at 6pm gets a high engagement total from a large audience with lots of competition. Later measures rate, Sprout measures total, and both are right about what they measured.
How do I find my own best time?
Instagram Insights, Total followers, Most active times. It shows when your followers are on the app. Test one slot from that chart for two weeks with everything else held steady, then a second slot. The gap between the two is how much timing matters for you.
Does the time I order engagement matter on Instagram?
Not measurably. Across 543,708 Instagram orders, the busiest and quietest hours delivered at the same rate, a ratio of 1.06 with a confidence interval that crosses 1. On TikTok we found a real off-peak edge; on Instagram we looked for the same thing and it is not there.
Should I post on weekends on Instagram?
The data says it is the weakest slot, and for Instagram the studies agree on that rather than contradicting each other as they do for TikTok. If your own Insights show weekend activity, test it; if not, spend the post on a weekday.
