Four credible studies name four different best hours. That looks like the data is useless. It is not: the studies agree on more than they disagree on, and the disagreement itself is informative.
What each study found
| Source | Sample | Best hour | Best day |
|---|---|---|---|
| CallHippo | 50,000+ calls | 4 to 5pm, then 8 to 9am | Wednesday, 48% better than Monday |
| Cognism | Cold calling report, 2025 | 10 to 11am, then 2 to 3pm | Tuesday |
| Gong | Conversation intelligence corpus | Not specified | Wednesday and Thursday |
| Revenue.io | Aggregate | Late afternoon | Midweek |
Where they agree
Midweek beats the ends of the week. Every study finds Monday and Friday weakest. Monday is consumed by planning and email backlog; Friday by wrapping up and leaving early.
The middle of the day is dead. Nobody finds 12 to 2pm strong. People are eating, or in the post-lunch slump, or in the meetings that got scheduled around lunch.
Two windows work. Late morning, after the inbox is cleared and before lunch. Late afternoon, after the day's meetings and before people leave. Those are the only two times a knowledge worker is both at their desk and not committed to something.
Where they disagree, and why
CallHippo says 4 to 5pm. Cognism says 10 to 11am. Both are large samples and both are probably right about their own data.
The likely explanation is who was being called. Late-afternoon strength shows up most in studies weighted toward senior decision-makers, whose mornings are scheduled by other people and whose late afternoons are the first unstructured time in their day. Late-morning strength shows up most in studies weighted toward operational roles, who are at their desk in the morning and in meetings later.
The practical conclusion: if you sell to executives, dial late afternoon. If you sell to managers and operators, dial late morning. If you sell to both, split your day.
The variable that beats all of them
Time zone.
None of these studies corrects for the fact that a large share of calls are placed into the wrong local hour. A rep in New York working a national list at 9am is calling Pacific-time prospects at 6am. Those dials are wasted, and they are actively harmful because unanswered calls degrade your number's reputation.
Sorting a list by the prospect's local time and dialing each region inside its own two windows produces a larger connect-rate gain than any amount of optimising within a single time zone. Most dialers can do this if the list holds a state or an area code; almost nobody sets it up.
The other variable nobody talks about
The number of attempts, and varying them.
It takes an average of three attempts to reach a prospect, with 93 percent of conversations happening by the third call. Most reps stop after two.
More importantly, attempt two should not be at the same hour as attempt one. A prospect who did not answer at 10am Tuesday is a different prospect at 4pm Thursday. Reps who dial the same list at the same time every day are re-testing the same hypothesis and calling it persistence.
A sensible cadence for a cold list:
| Attempt | Timing |
|---|---|
| 1 | Late morning, their time |
| 2 | Same week, late afternoon, their time |
| 3 | Following week, different day, late morning |
| 4 | Following week, late afternoon |
| 5 to 6 | Week three, alternating |
A note on Friday afternoon
Conventional advice says do not bother. Connect rates are lower, which is true on average.
The counter-argument is competition. Almost nobody is dialing at 3pm on Friday, and decision-makers clearing their week are often at their desk with nothing scheduled. It is a low-volume, low-competition slot, and treating it as a write-off leaves the least-contested hour of the week on the table.
What this is worth
Timing is a real effect and a second-order one. Moving your dialing into the right windows might lift connect rates by a few percentage points.
Moving from a generic purchased list to verified direct dials moves connect rates from 8 to 12 percent up to 18 to 22 percent. That is an order of magnitude bigger effect than the hour of the day.
Fix the list first. Then fix the hour.
Frequently asked questions
- What is the best time of day to cold call?
- Between 4 and 5pm and between 10 and 11am in the prospect's own time zone, according to the two largest published analyses. CallHippo's study of over 50,000 calls puts 4 to 5pm first and 8 to 9am second; Cognism's data puts 10 to 11am first and 2 to 3pm second. Both agree that the hour after lunch and the first hour of the morning, when people clear email, are the weakest.
- What is the best day of the week to cold call?
- Midweek. CallHippo found Wednesday the strongest day with 48 percent higher first-attempt connect rates than Monday, Cognism found Tuesday, and Gong's analysis found Wednesday and Thursday outperforming Monday and Friday. The studies disagree on which midweek day and agree that Monday and Friday are the weakest.
- Is it worth cold calling on a Friday?
- Yes, at the right hour. Friday connect rates are lower on average, but Friday afternoon is one of the least-competitive windows because most reps have stopped dialing, and decision-makers are often clearing their week. Treat it as a lower-volume, lower-competition slot rather than a day to skip.
- Does time zone matter more than time of day?
- Yes. A rep in New York dialing California at 9am is calling people who are asleep, and no published study on best calling hours corrects for how often that happens. Sorting a list by the prospect's local time and dialing each region in its own late-morning and late-afternoon windows produces a larger connect-rate gain than optimising the hour within a single time zone.