B2B Cold Email Open Rates by Industry, Subject Line

Cold email remains one of the most effective ways to start conversations in B2B sales, but success depends on more than just hitting “send.” Open rates vary widely by industry, subject line, and even the time of day an email is delivered. In 2025, the average B2B cold email open rate sits around 39%, but sectors like energy management systems and investment firms see results nearly double those of SaaS or IT services. 

This report breaks down the latest benchmarks across industries, subject lines, and send times so you can better understand where your campaigns stand and where adjustments could deliver higher engagement.

Key Takeaways

• The average B2B cold email open rate is ~39%, but open rates range widely by industry.
• Energy management systems lead the pack with 46.31%, while SaaS lags at 25.71%.
• The best-performing subject line is “Hi {{first_name}}”, which earns a 45.36% open rate.
• Sending cold emails on Thursday between 9 and 11 a.m. yields the highest open rates.

The average B2B cold email open rate is ~39% across all industries, but this number lacks the specificity needed to measure the results of cold email campaigns as the open rates vary widely by industry. Some industries rely more heavily on email as a communication medium, naturally raising open rates, versus other industries where email is less commonly used for organizational communication, which can lower open rates. 

This report breaks down the latest open rate data across three key areas so you can benchmark your performance and improve your outreach strategy:

This analysis is not a benchmark for ideal performance, but rather a reflection of average results for well-executed campaigns. To ensure accuracy, this data assumes each campaign followed deliverability best practices:

• Proper DMARC, SPF, and DKIM configuration
• A domain warm-up period of 2–4 weeks
• Minimal spam triggers in body copy and subject lines

Lastly, this report is not a benchmark of where a campaign should be performing for maximum output, but rather an average of where most campaigns are performing. 

Average B2B Cold Email Open Rates by Industry

Cold email isn’t a one-size-fits-all channel. Open rates are influenced by the communication culture of your target industry. 

For example, sectors like investment and energy tend to engage more with unsolicited email. This could potentially be due to longer sales cycles or a high volume of vendor outreach being standard. Others, like SaaS, are less receptive, with an open rate among the lowest at just 25.71%. This could stem from internal spam filters or a buyer group that simply doesn’t use email as a discovery tool.

The takeaway? If your industry averages below 30%, your focus should shift toward improving targeting and personalization, not just email frequency.

Average B2B Cold Email Open Rates by Subject Line

Subject lines remain the single greatest driver of opens, but high-performing options tend to sound casual, direct, and personalized. Many of the top lines in this report start with the recipient’s name and hint at a conversation, not a sales pitch.

For example:

• “Hi {{first_name}}” (45.36%)
• {{first_name}}, made this for you (42.71%)
• “{{first_name}}, can I get your feedback here?” (43.45%)

These work because they mimic real human conversation. They don’t look like marketing automation; they look like a message from a colleague or friend. If your current open rate is less than ideal, run A/B tests using variants of the top subject lines listed here and track the shift in performance.

Average B2B Cold Email Open Rates by Day/Time of Email

Most marketers know timing matters, but few actually think about adjusting send times by industry. In the 2025 data set, Thursday mornings between 9 to 11 a.m. had the highest open rate at 44.0%, followed closely by Tuesday and Wednesday mornings. That timing makes sense because many people check email early in the day before meetings or work begins. But sending on Saturday at 3 to 5 p.m.? Expect open rates around 30% or lower, making it one of the least effective times to reach a B2B audience.

Further Reading & Next Steps

Check out these other helpful reports on what it costs to get new customers, how well lead magnets work, and how to measure your marketing funnel:

• Customer Acquisition Cost by Industry Statistics
• Lead Magnet Conversion Rates by Industry
• Marketing Funnel KPIs By Funnel Type

Sources:

• Email marketing benchmarks by industry and region for 2025
• Email Open Rates By Industry (& Other Top Email Benchmarks)
• B2B Cold Email Subject Lines: The Ultimate Guide to Higher Open Rates in 2025
• Email Marketing Benchmarks and Metrics Businesses Should Track