Growth experimentation: A guide for growing marketing teams Growth experimentation is a structured approach to testing ideas across the full customer journey to discover what drives measurable business growth. Experiments improve channel-by-channel optimization as marketing teams push for measurable, repeatable growth under tight budgets. The pressure is real. In HubSpot’s 2026 State of Marketing report, 73% of marketers say their budgets and ROI are under greater scrutiny, while 83% of teams say leadership expects them to deliver even more content. The natural response for teams is to test more. As the buyer journey becomes scattered and unpredictable, growth marketers need to learn what drives acquisition and retention quickly — and which signals are worth scaling. HubSpot Marketing Hub gives teams one place to run experiments, segment audiences, and measure results across the full funnel. Table of Contents What is growth experimentation? Why Growth Experimentation Matters Now How to Build a Growth Experimentation Strategy How to Build a Culture of Experimentation Across Teams Growth Experimentation Pitfalls and Fixes Frequently Asked Questions About Growth Experimentation What is growth experimentation? Growth experimentation is a structured approach to testing ideas across the full customer journey to discover what drives measurable growth. Marketing leaders use experiments to test messaging offer-types, timing, and journey design. Teams can then scale what works over time. Unlike isolated tests, growth experimentation focuses on validated learning. Each experiment starts with a hypothesis. Marketers decide what metrics determine success, then...

Marketing experiments every growth team should run Every reliable tactic marketers now love, from video content to email marketing and blogging, was once a new experiment that early adopters tested and developed. Creating new marketing strategies is foundational to marketing, helping brands reach new customers and gather data that helps facilitate smarter business decisions. While experimentation isn‘t new, digital marketing offers brands greater flexibility and potential. Let’s look at experiment types, which metrics to track, and how to design experiments across marketing channels to achieve maximum success. Table of Contents What are marketing experiments, and how do they work? The Elements Every Marketing Experiment Needs A/B vs. Multivariate Marketing Experiments Steps to Design and Run Marketing Experiments Common Pitfalls That Break Marketing Experiments Tools to Plan, Run, and Analyze Marketing Experiments Real‑World Marketing Experiment Examples Marketing Experiment Examples by Funnel Stage Frequently Asked Questions About Marketing Experiments What are marketing experiments, and how do they work? Marketing experiments are controlled changes to a marketing message or campaign to improve reach or conversion rates. These tests can be a small, single tweak or a campaign-wide experiment. Successful marketing experiments assess both quantitative data and qualitative factors, and the campaign results directly feed the next iteration of marketing materials. Experiments are a part of step four in the Loop Marketing cycle: evolve in real-time. Here are quick examples of marketing experiments feeding the loop: ...