B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Current
23%
23% -- share of replies best send day for cold email replies (CIENCE study) (2026)
According to a CIENCE study of 6 million outbound emails, 23% of cold email replies come on Wednesday (the best day).
Attribution:
View source
Lighthouse Research Team
Last verified:
·
How we verify data →
Source verified
Evidence graded
Value
23%
Unit
Percentage
Data Vintage
2026
Entity
Sample Size
6,000,000
Evidence Quality
B
Strong, reliable evidence
Sourced from a well-regarded research firm or industry leader with transparent methodology and a reasonably large sample.
Single source - not yet corroborated
Score breakdown
Extraction
75
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Source
CIENCE
Primary
Tier B
https://graph8.com/insights/ ↗
Source Article
graph8 Insights: changelogs, playbooks, and GTM research
graph8 Insights is the shared library for product changelogs, GTM research, sales development, and practical playbooks across graph8, CIENCE, Tenbound, and Build.
Research 13 posts
Most positive replies arrive after the touch most reps never send. This review connects the behavioral science of imple…
Original Research
CIENCE
· Original study ↗
Methodology
CIENCE study of 6 million outbound emails; best time 8 AM Wednesday
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
cold email replies (CIENCE study): 23% share of replies best send day. Source: CIENCE (2026). Via Lighthouse Intelligence -- https://lighthousedata.io/data/cience-6m-email-wednesday-8am
HTML Embed
<blockquote cite="https://lighthousedata.io/data/cience-6m-email-wednesday-8am" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>23%</strong> -- share of replies best send day for cold email replies (CIENCE study)<br><small>Source: CIENCE (2026) · <a href="https://lighthousedata.io/data/cience-6m-email-wednesday-8am" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
Share
Use this data in your work
Copy the citation, embed the widget, or explore thousands more verified marketing statistics -- all free.