How ZoomInfo measured cold calling performance
To determine the best days for cold calling, ZoomInfo analyzed data on more than 1.4 million outbound calls to new business accounts over several months (ZoomInfo proprietary dataset).
This is B2B outbound data, every call in the sample was made to a new business account, so the findings speak directly to the cold calling patterns that matter for SDRs and AEs prospecting net-new pipeline.
Key metrics in the analysis included:
Call connect rates
Demo volume from cold calls
Call-to-demo conversion rates
The ratio of positive to negative calls based on sales reps' assessments
The findings revealed clear trends on which days work best for cold calling.
The best days to cold call, ranked by the data
Tuesday and Wednesday are the best days to cold call. Together they account for 44% of all demos booked in ZoomInfo's dataset of 1.4M+ outbound calls (ZoomInfo proprietary dataset). Tuesday leads on connect rates; Wednesday leads on raw call volume. If you can only protect two call blocks per week, protect Tuesday and Wednesday.
Cognism's 2025 State of Cold Calling Report also names Tuesday as the top day for meetings booked, aligning with ZoomInfo's connect-rate data and adding a second independent data point to the Tuesday consensus.
The middle of the week works because of where decision-makers are mentally. By Tuesday, they've cleared Monday catch-up but haven't entered end-of-week wind-down. Wednesday sits at peak weekly focus. Thursday begins the slide toward the weekend. The data follows that curve almost exactly.
Here's how each day of the week stacks up:
Monday
Despite a high connection rate, Monday is not a top day for demo creation, which is dominated by Tuesday and Wednesday.
Monday's results do show the highest efficiency (call-to-demo) rate of 1.19% (ZoomInfo proprietary dataset), indicating it's a good day for converting calls to demos when you do connect. Mondays also share the highest positive call rate with Tuesdays at 4.8%. If your goal is to book meetings from those converted calls, pairing this timing data with research on best days for product demos can help you schedule follow-ups when prospects are most likely to show up and engage.
A major factor keeping Monday out of the top tier is simply volume: call volume on Mondays is about 15% lower than Tuesday (ZoomInfo proprietary dataset), so it's reasonable to assume that higher volume would drive efficiency metrics down. Prospects are also catching up on work left from the prior week, which makes them less receptive to new conversations.
Tuesday
Tuesday is the top-rated day for cold calling.
Tuesday has the second-highest call volume in the sample and the highest call connect rates. Keeping a high average with that much volume is unusual, but Tuesday's calls pull it off.
Tuesday also ties Monday for the highest positive call rate (4.8%) while maintaining a relatively even negative rate. Tuesday calls drive the most demos alongside Wednesdays. Decision-makers have cleared overnight emails and Monday's backlog but haven't yet entered the midweek meeting crunch that starts compressing calendars.
Wednesday
Wednesdays are the second-place cold calling day.
Wednesdays have the highest volume of calls in the sample, with a connect rate noticeably lower than Tuesday's. Positive call sentiment is also markedly lower on Wednesday, an indication that some of those calls could be rolled to Monday or Tuesday for better performance.
Together, Tuesday and Wednesday account for 44% of all demos in the sample (ZoomInfo proprietary dataset). When looking at Europe, Middle East, and Africa, Wednesdays improve with a higher connect rate, call positive rate, and cold call-to-demo conversion rate.
Thursday
Metrics begin declining on Thursdays, though it remains the third best day for demos.
It's a distant third behind Tuesday and Wednesday. Connect rates, positive rates, and demos all decrease compared to earlier in the week. Prospects are beginning to shift attention toward end-of-week priorities and any remaining deliverables before Friday.
Friday
Fridays perform worst on every metric, lowest call volume, connection rates, demos, and positive rates by a substantial margin.
The worst days to cold call (and what to do instead)
Monday and Friday are the worst days for cold calling, and for good reason.
On Mondays, workers are getting back into the flow of the work week and catching up on work left from the prior week. The mental bandwidth for a new vendor conversation simply isn't there.
On Fridays, many people take time off, leave work early, or aren't as focused as they are mid-week. In the middle of the week, potential customers have acclimated to the current work week and are more flexible and more willing to answer a phone call and consider a sale.
Saturday and Sunday are off-limits for B2B cold calling: decision-makers are not at their desks, and calls outside business hours signal poor judgment to the prospect.
How can sellers react? Tailoring your ask and framework to the prospect's behavior can still pay off later in the week, when a harder sell or direct pitch might not land. Consider using Friday calls to tee up concepts for the week ahead.
"Reaching decision-makers on a Friday can be tougher, but prioritizing your efforts at the executive level can still pay off later in the week," says Sean Dwyer, a senior director of sales development at ZoomInfo. "As the week winds down for them, you've got an opportunity to introduce a fresh idea to explore as they finalize their calendars for the following week."
Best times of day to cold call
Timing isn't just about which day you call, it's about which hour you reach a prospect when they're actually receptive.
The two consensus peak windows for cold calling are 10–11 AM and 4–5 PM in the prospect's local time zone. These aren't arbitrary ranges. Each window maps to a predictable pattern in how knowledge workers structure their day.
The morning window works because decision-makers have cleared overnight emails but haven't entered the midday meeting block. The hour between 10 and 11 AM is often the first stretch of uninterrupted focus in the workday, which means a well-timed call lands before the calendar fills up.
The late-afternoon window works because the pre-end-of-day period catches prospects wrapping tasks before they log off. They're in a closing mindset rather than a starting one, which can make them more open to a short conversation about something new.
A foundational study from MIT and InsideSales (2007–2008) found that late-afternoon calls were 114% more effective than mid-morning calls. That study is now nearly two decades old, and work patterns have shifted significantly since then, but the directional finding, that late afternoon outperforms mid-morning, still aligns with what practitioners report today. ZoomInfo's own day-level data shows similar patterns in how connect rates and positive sentiment vary across the week, suggesting the time-of-day dynamics follow comparable logic.
For best time for cold calling results, always calculate these windows in the prospect's local time, not yours. A rep in New York calling a prospect in Seattle at 4 PM EST is actually reaching them at 1 PM PST, a window that falls squarely in the midday meeting block.
Why the data is evolving: what's changed since the classic studies
The foundational cold calling timing studies are aging. MIT and InsideSales published their landmark research in 2007–2008. Gong followed with analysis in 2017. CallHippo released findings in 2019. No major large-scale study has replicated or updated these findings with post-pandemic data.
That matters because the structural conditions those studies measured have changed. Remote and hybrid work patterns mean decision-makers are no longer reliably at a desk during traditional business hours. Spam-call filtering has become more aggressive, with carriers and mobile operating systems flagging unfamiliar numbers before the phone even rings. AI-powered dialers have increased outbound call volume industry-wide, which affects answer rates across the board.
Where the studies agree: Tuesday through Thursday, mid-morning and late afternoon, consistently outperform Monday morning and Friday afternoon across every dataset. That consensus has held across nearly two decades of research and multiple methodological approaches.
Where they diverge: Cognism's 2025 State of Cold Calling Report names Tuesday as the clear leader for meetings booked, while older studies from Gong and CallHippo pointed to Wednesday and Thursday as the top days. The divergence likely reflects both methodological differences and real shifts in buyer behavior since 2017–2019.
The practical implication: treat published benchmarks as starting points, not gospel. Run your own A/B tests on call windows using your CRM data. Your industry vertical, prospect seniority level, and geographic mix will all create patterns that deviate from the published averages. The reps who win on timing are the ones who test their own data, not the ones who follow a 2007 study.
Time-zone alignment and compliance: the hidden timing variable
Every timing recommendation in this article assumes one thing: you're calculating the window in the prospect's local time, not yours.
This is where a lot of reps quietly lose the edge. A rep based in Boston calling a prospect in Los Angeles at 4 PM EST is actually calling at 1 PM PST, right in the middle of the midday meeting block, one of the lower-performing windows. The call goes to voicemail. The rep marks it as a miss. The timing data looks like it isn't working, when the real problem is a time-zone miscalculation.
There's also a compliance dimension. TCPA (Telephone Consumer Protection Act) calling-hour restrictions vary by state and apply to the prospect's local time zone, not the caller's. Calling a prospect in California at 7 AM PST from an East Coast office may be legal where the rep sits but violates TCPA restrictions in the prospect's state. The regulation is referenced by name here rather than specific penalty figures, but the risk is real and the consequences for regulated industries (financial services, insurance, healthcare) can be significant.
The practical fix is straightforward: configure your dialer or CRM to display the prospect's local time alongside their contact record. Most modern dialers support this natively. If yours doesn't, it's worth flagging to your RevOps team before it becomes a compliance issue.
Timing is only half the equation: why data quality determines your connect rate
Calling at the perfect time with a bad phone number produces zero results. Tuesday at 10 AM is the best cold calling window in ZoomInfo's dataset, but that window is worthless if the number you're dialing belongs to someone who left the company two years ago.
ZoomInfo is the all-in-one AI GTM Platform built to close that gap. The platform is built on three foundations: verified data at scale, the intelligence layer that makes that data actionable, and the access points that put it in front of reps without adding another tool to the stack.
The data foundation is where connect rates start. ZoomInfo's database includes 120M+ direct-dial phone numbers and 200M+ verified business emails, continuously verified so reps reach the right person rather than a disconnected line or a stale record. When you're calling on a Tuesday morning, you need to know the number you're dialing is current.
The GTM Context Graph layers buying signals on top of that contact data. It processes 1.5B+ data points daily, fusing ZoomInfo's B2B data with CRM records, conversation intelligence, and behavioral signals into a unified intelligence layer. The result is that reps aren't just calling on the right day, they're calling accounts that are actually in-market right now. Timing and intent together is a different conversation than timing alone.
GTM Workspace is the access point that makes all of this usable for a quota-carrying rep. It surfaces AI-prioritized account feeds so reps can act on timing insights without manual research or context-switching between tools. The accounts that are showing buying signals, with verified contact data, prioritized by likelihood to convert, that's the list you want to be working on a Tuesday morning.
The productivity impact is measurable. Seismic achieved a 54% productivity gain and saved 11.5 hours per week per rep after deploying GTM Workspace. That's time that goes back into call blocks, not into manual research.
Request a demo to see how ZoomInfo's direct-dial data and GTM Workspace's AI-prioritized account feed can change your connect rates.
Putting it all together: a practical weekly cold call schedule
Here is how to translate the data into a repeatable weekly schedule.
Day | Recommended Activity | Rationale |
|---|---|---|
Monday | Light prospecting; use for call-to-demo conversion on warm leads | Highest efficiency rate (1.19% call-to-demo) but 15% lower volume than Tuesday; good for converting, not for high-volume cold outreach |
Tuesday | Peak cold call blocks: 10–11 AM and 4–5 PM (prospect's local time) | Highest connect rates and positive sentiment in the dataset; top day for demos alongside Wednesday |
Wednesday | Peak cold call blocks: 10–11 AM and 4–5 PM (prospect's local time) | Highest raw call volume in the dataset; Tuesday and Wednesday together account for 44% of all demos |
Thursday | Moderate cold call blocks; prioritize your highest-value prospects | Metrics declining but still the third-best day for demos; use for accounts that warrant extra attempts |
Friday | Follow-up calls only; no new cold outreach after 2 PM; executive introductions per Sean Dwyer's guidance | Worst day on every metric; use for concept-planting and calendar-setting for the following week |
Saturday | No cold calling | Decision-makers are not at their desks; calls outside business hours signal poor judgment |
Sunday | No cold calling | Decision-makers are not at their desks; calls outside business hours signal poor judgment |
Adjust these windows for your prospect's industry and time zone. Real estate, financial services, and C-suite prospects may have different availability patterns than the B2B SaaS median. Run your own call data against these benchmarks quarterly, the best days to cold call for your specific territory may skew slightly from the aggregate.
Frequently asked questions
What is the best day of the week to cold call?
Tuesday and Wednesday are the top days based on ZoomInfo's analysis of 1.4M+ outbound calls, together they account for 44% of all demos booked. Tuesday leads on connect rates; Wednesday leads on raw call volume. Cognism's 2025 State of Cold Calling Report independently names Tuesday as the best day for meetings booked, adding a second data point to the consensus.
What is the worst day to cold call?
Friday is the worst weekday for cold calling on every metric: lowest volume, connection rates, demos, and positive sentiment. Weekends (Saturday and Sunday) are off-limits for B2B cold calling, decision-makers are not at their desks and calls outside business hours signal poor judgment. Monday is the weakest weekday despite a reasonable efficiency rate, because prospects are catching up from the prior week.
What are the best times of day to cold call?
The two peak windows are 10–11 AM and 4–5 PM in the prospect's local time zone. Mid-morning catches decision-makers after they've cleared overnight emails but before the midday meeting block. Late afternoon catches them wrapping tasks before end of day. Always calculate these windows in the prospect's local time, not yours, a miscalculated time zone can turn a peak window into a voicemail. For more on optimizing the full outreach-to-meeting flow, see best days for product demos.
What are the three C's of cold calling?
The three C's of cold calling are commonly defined as Connect, Converse, and Close, or alternatively Confidence, Clarity, and Conciseness depending on the framework. The first set focuses on the call stages (getting through, having a real conversation, and securing a next step); the second focuses on rep delivery skills. Both frameworks emphasize that timing optimization only matters if the rep is prepared to execute when the prospect picks up.
How many cold calls should a rep make per day?
100 cold calls per day is at the high end of what most B2B reps sustain, typical benchmarks range from 40–80 calls per day for SDRs. More important than raw volume is window concentration: 50 calls made during Tuesday–Thursday peak windows (10–11 AM and 4–5 PM local) will outperform 100 calls spread randomly across the week. Quality of contact data also determines how many calls translate to actual conversations.
Does data quality affect cold call connect rates?
Yes, calling at the optimal time with an invalid or stale phone number produces zero results. ZoomInfo's database of 120M+ direct-dial phone numbers is continuously verified so reps reach the right person, not a disconnected line or a contact who left the company two years ago. Accurate data and optimal timing work together; neither alone is sufficient. See how ZoomInfo improves connect rates.