The best time to send cold emails

March 24, 2026

I sent 847 cold emails last month. Same templates, same list quality, distributed across different days and times.

Tuesday at 9:07am ET got a 62% open rate. Friday at 3:30pm ET got 34%.

Same email. Same list segment. The only variable was when I hit send. Timing won’t fix a bad email, but it can kill a good one.

Here’s the data.

Day of week

Tuesday through Thursday is the window. That’s when my numbers consistently perform above average.

Monday underperforms because inboxes are flooded from the weekend. People are triaging, not reading. Your cold email is competing with 50+ unread messages.

Friday underperforms because people are already checked out. They’re wrapping up, not starting new conversations. Even if they open it, the reply rate drops because they think “I’ll get to this Monday” – and they don’t.

Weekends are dead. I tested it with 77 emails over 2 months. Open rates are low, reply rates are lower. The few replies I got came Monday morning anyway, which means they sat on it – and sitting on a cold email usually means ignoring it.

Time of day

8:00-10:00am in the recipient’s timezone is the sweet spot. That’s when people are processing their inbox with fresh attention. Your email lands near the top of the morning batch.

The early morning slot (6-8am) is decent but not great. Some people aren’t at their desk yet. The email ages in the inbox and gets buried by other messages.

The lunch dip is real. 12-2pm drops across the board. People step away, come back to a stacked inbox, and skim aggressively. Your carefully personalized email gets the same 2-second scan as a newsletter.

Late afternoon is the worst time to send. People don’t start new conversations after 4pm. They’re closing out their day, not opening relationships with strangers.

The timezone problem

This is the part most people skip, and it’s the part that matters most for anyone sending outside their own timezone.

If you’re in ET and your prospect is in PT, your 9am send hits their inbox at 6am. That’s not the morning processing window – that’s pre-coffee.

I segment every list by timezone before scheduling. Here’s my setup:

1. Tag each prospect with their timezone (most prospecting tools give you this from their LinkedIn or company location)
2. Create send batches by timezone
3. Schedule each batch to land at 8:30-9:30am in the recipient’s local time

This is more work than blasting everything at once. But the data justifies it. When I started segmenting by timezone, my overall open rate went from 47% to 54%. That’s 7 points from a scheduling change.

For international prospects, I follow the same principle – land in their morning. I have a few prospects in the UK and EU. I schedule those batches to hit at 9:00am GMT or CET. The patterns hold across time zones.

The timing I actually use

Here’s my exact weekly schedule:

Tuesday:   8:30am recipient-local  →  New first touches
Wednesday: 9:00am recipient-local  →  Follow-up touches (day 3)
Thursday:  8:30am recipient-local  →  New first touches (2nd batch)

That’s it. 3 send days per week. I front-load Tuesday and Thursday for first touches because fresh emails perform best on Tuesday and Thursday. Wednesday is for follow-ups because recipients have had time to see the first touch.

I don’t send on Monday, Friday, or weekends. The data doesn’t support it.

What about “off-peak” sending?

I’ve seen advice suggesting you should send at odd hours – 5:47am, 11:13pm – to stand out in an empty inbox.

I tested this. 40 emails sent between 5:00-6:00am on weekdays.

Open rate: 44%. Reply rate: 5%.

The empty inbox theory doesn’t hold. The email lands early, gets pushed down by everything else that arrives between 7-9am, and ends up in the same crowded inbox you were trying to avoid. The timing advantage evaporates.

The one exception: if your prospect is a known early riser who posts on Twitter at 5am, sure, match their schedule. But as a general strategy, off-peak sending doesn’t work.

Does send time really matter that much?

Honest answer: it matters, but less than your subject line, personalization, and CTA.

If your email is good, sending it on Wednesday at 9am instead of Friday at 4pm might add 5-10 points of open rate. That’s meaningful. But if your email is bad, perfect timing won’t save it.

Think of timing as a multiplier. A great email sent at a bad time still beats a bad email sent at a good time. But a great email sent at a good time beats both.

Here’s how I’d prioritize if you’re just starting out:

1. Get the email right – subject, opener, CTA, length
2. Make sure you’re actually landing in inboxes (deliverability basics)
3. Then optimize timing

Don’t obsess over timing until steps 1 and 2 are solid. But once they are, the timing edge compounds. Over 847 emails, the difference between good timing and bad timing was 34 extra opens and 9 extra replies. That’s 9 conversations I wouldn’t have had.

For the full picture on cold email execution, see the sequence examples post – it covers timing between touches, not just timing of individual sends. And if you’re tracking all of this and want to know which numbers to focus on, the metrics post breaks down what to measure and what to ignore.