Why I send cold emails on Tuesday and Thursday only and the data behind it
tuesdays_only · 2026-04-03 · 2,210 views
Eight months ago I started tracking reply rates by day of the week across every campaign I run. I was sending Monday through Friday evenly, roughly 20% of weekly volume each day. After 50,000+ sends, the data was clear enough that I changed my entire sending schedule.
The raw data (reply rates by send day):
- Monday: 2.7% reply rate
- Tuesday: 4.2% reply rate
- Wednesday: 3.1% reply rate
- Thursday: 4.0% reply rate
- Friday: 2.4% reply rate
Tuesday and Thursday consistently outperformed the other three days. This was not a one-month fluke. The pattern held across every single month of the 8-month tracking period. The gap between the best day (Tuesday, 4.2%) and the worst (Friday, 2.4%) is a 75% improvement. That is enormous for a variable that costs nothing to change.
Why Monday underperforms: People come back from the weekend to a full inbox. They are triaging emails from Friday afternoon, weekend automated reports, internal Monday morning threads, and meeting prep. Your cold email from a stranger competes with 50+ other messages for attention. Most people batch-delete anything that is not urgent on Monday morning.
Why Wednesday underperforms: Midweek is peak meeting day for most B2B professionals. VPs and Directors I target typically have their heaviest meeting loads on Wednesday. They are in back-to-back calls from 9am to 4pm. Email gets checked in quick bursts between meetings, and cold emails from strangers do not survive that filter.
Why Friday underperforms: People are mentally wrapping up their week by Friday. They are finishing deliverables, sending EOW updates, and planning for the weekend. A cold email about a problem they need to solve "sometime" gets pushed to Monday, and by Monday it is buried under the new week's flood.
Why Tuesday and Thursday win: Tuesday is the first day people are actually settled into their week. Monday's inbox is cleared, the week's priorities are set, and they have bandwidth to engage with new information. Thursday has a similar dynamic. The midweek meeting crunch is over, Friday is tomorrow so there is a slight sense of urgency to handle things before the week ends, and inbox volume is lower than Monday or Wednesday.
What I changed: I now concentrate 100% of my sending volume on Tuesday and Thursday. Same weekly total, just compressed into two days instead of five. Each inbox sends slightly more on those two days (but still within safe limits at 18-20 per inbox per day). My overall weekly reply rate went from 3.3% (spread across 5 days) to 4.4% (concentrated on Tuesday and Thursday). That is a 34% improvement.
Send timing within those days: I schedule sends between 8:00 AM and 10:30 AM in the prospect's local timezone. Morning emails perform better because they land in the inbox before the day's meeting schedule takes over. Afternoon sends (after 2 PM) consistently get lower reply rates in my data.
I know some people will say this is too small of a sample or too specific to my ICP. Fair. Test it yourself. Track reply rates by day for 60 days and see if the pattern holds. In my experience and in every conversation I have had with other high-volume senders, Tuesday and Thursday come out on top. The specific reply rate percentages will vary by ICP, but the relative ranking of days stays consistent.
This is one of those optimizations that costs absolutely nothing to implement. You are sending the same number of emails per week. You are just sending them on the days when people are most likely to read and reply.