TL;DR
Tuesday through Thursday, 7–9am or 1–3pm in the recipient's timezone, consistently outperform other times. Monday morning gets lost in catch-up; Friday afternoon gets ignored. The effect is real but modest — great emails sent at suboptimal times still work better than bad emails sent at perfect times.
Send time optimization is real, but it's the last 5% — not the first. Don't obsess over it until your email copy and targeting are dialed in.
Best days: Tuesday, Wednesday, Thursday. Monday mornings are inbox catch-up, and most people have their week planned. Friday afternoons are mentally checked out.
Best times (in recipient's timezone): - 7:00–9:00am: People check email before meetings start. Quiet, focused inbox time. - 1:00–3:00pm: Post-lunch, often fewer internal meetings. Good for catching people between tasks.
Times to avoid: - Monday before 10am: Caught in weekly planning mode - Friday after 3pm: Weekend mentality has set in - Any time outside business hours in recipient's timezone: Email sits in a pile and gets buried
How much does timing actually matter? Studies consistently show a 10–20% difference in open rates between best and worst times. That's meaningful at scale, but it won't save a bad email. Fix the copy first, then optimize timing.
Practical approach: If you're using a sending tool like Instantly, set the campaign to send in the recipient's timezone (most tools support this). Select a 4-hour sending window: 8am–12pm or 1pm–5pm, Tuesday–Thursday. The tool spreads your sends across that window.
International considerations: Time zones compound when prospecting globally. A sequence sending to London, New York, and Singapore simultaneously needs to be configured with timezone-aware delivery or you'll have cold emails arriving at 2am.
Follow-ups: The best follow-up email is the one sent 2–3 business days after your first email, mid-week. Don't send follow-ups the next calendar day — that's aggressive and reads as desperate.
From Cactus: Cactus configures all client campaigns with timezone-aware sending windows — a small but consistent improvement across our client portfolio.
Cactus Marketing embeds with B2B tech startups to turn strategy into pipeline. We've worked with 60+ companies, supported 12 exits, and contributed to $7B+ in client valuations.
Book a free 30-minute call — we'll give you a concrete plan for your situation.
Book a free strategy call →How do I write a cold email that gets replies?
Write one sentence that's specifically about them, one sentence on their problem, one on your solution, and one CTA. The email should be under 80 words, reference something real about their company, and ask a yes-or-no question at the end.
How do I find leads for cold email?
Start with Apollo.io or LinkedIn Sales Navigator to build a list from your ICP criteria. Enrich it through Clay or a waterfall of data providers for verified emails. Target trigger events — recent funding, new hires, job postings — to catch companies in active buying moments.
What is a good cold email reply rate?
A good cold email reply rate is 3–8% for a broad ICP campaign and 8–15% for a highly personalized, trigger-event-based campaign. Anything above 15% with meaningful volume is excellent. Below 2% means something fundamental is wrong — ICP, targeting, or the email itself.
How many cold emails should I send per day?
New domains should warm up for 2–4 weeks before sending real campaigns, starting at 10–20 emails/day and capping out at 30–50/day per domain for sustained campaigns. With multiple warmed domains running in rotation, total volume can reach 500–2,000+/day without domain damage.