9 HubSpot migration risks for mid-market B2B teams (and how to avoid them)
July 2026 · 6 min read
Moving your CRM looks simple on paper. Export the data, import it into HubSpot, done. In practice, a CRM migration touches everything: your contact records, your sales workflows, your reporting, your integrations, your team’s daily habits. Get it right and nobody on your team notices the switch. Get it wrong and you’re cleaning up bad data for the next year.
We’ve done many HubSpot onboardings, and migration is where we see the most avoidable mistakes. Whether you’re moving from Salesforce, Marketo, Zoho, or off a patchwork of spreadsheets, here are the nine risks that come up most often for mid-market B2B teams, and what to do about each one.
1
Losing historical data in the transfer
Every CRM stores data a little differently. Fields that seem equivalent on the surface (deal stage, lifecycle stage, lead status) often don’t map one to one. If you migrate without a field-by-field plan, you risk losing years of deal history, notes, and activity timelines in the process.
How to avoid it: Map every field before you touch the export button. Decide what gets migrated, what gets archived, and what gets left behind on purpose. A good CRM data migration plan is really a data audit with a moving date attached.
2
Workflows and automations that don't survive the move
Your old CRM probably runs on a web of automations you built up over years: lead routing rules, follow-up sequences, internal notifications. None of that transfers automatically. If you migrate the data but not the logic behind it, your team inherits a clean database and a broken process.
How to avoid it: Document your existing automations before migration, then rebuild the ones that still matter in HubSpot’s workflow tools. This is also a good moment to retire the automations nobody remembers why you built.
3
Duplicate and inconsistent contact records
Years of manual entry, list imports, and form submissions leave most CRMs full of near-duplicates: the same contact under two email addresses, a company name spelled three different ways. Migrate that as is and you’ve just moved your mess into a new system.
How to avoid it: Run deduplication and standardization before the migration, not after. It’s far easier to clean data in a system you already know than in a new one you’re still learning.
4
Custom fields and properties that don't map cleanly
Mid-market teams tend to have heavily customized CRMs, built around specific sales processes, industries, or reporting needs. Those custom fields rarely have a direct match in HubSpot’s default property set.
How to avoid it: Inventory your custom fields early and decide, property by property, whether to recreate them, consolidate them, or drop them. This is one of the most common places generic HubSpot migration checklists fall short, because it depends entirely on your business, not a template.
5
Integration gaps that break your tech stack
Your CRM probably isn’t operating alone. It likely connects to your marketing automation tool, your billing system, your support desk, maybe a custom app or two. Each of those integrations needs to be rebuilt or reconnected in HubSpot, and some of your old integrations may not have a HubSpot equivalent at all.
How to avoid it: Inventory every connected tool before migration and confirm HubSpot compatibility for each one. Budget time for integrations specifically. This step gets skipped constantly, and it’s usually where post-migration fire drills come from.
6
Downtime during the cutover
Sales and marketing teams can’t stop working while a migration happens. If the cutover isn’t planned carefully, you risk a gap where reps can’t access records, leads fall through the cracks, or reporting goes dark right when leadership wants visibility.
How to avoid it: Plan the cutover for a low-activity window, run both systems in parallel briefly if needed, and communicate the exact timeline to every team that touches the CRM.
7
Permission and access issues in the new system
Role-based permissions rarely transfer cleanly. Teams migrate the data and forget to rebuild who can see what, who can edit what, and which records are restricted. That’s a real risk if you handle sensitive customer or financial data.
How to avoid it: Rebuild your permission structure in HubSpot deliberately, based on current team roles, not whatever your old system happened to have configured three years ago.
8
Underestimating the timeline
A CRM migration is not a weekend project, even for a mid-sized team. Data cleanup, field mapping, workflow rebuilding, integration testing, and user training all take real time. Teams that rush the timeline usually end up doing the same work twice.
How to avoid it: Build in time for testing and a parallel run before full cutover. If your current estimate has no buffer in it, it’s probably wrong.
9
Choosing a migration partner without real HubSpot migration experience
Not every HubSpot partner has deep migration experience. Some are strong at net-new implementations but have never handled the specific challenges of moving live data and workflows out of Salesforce, Zoho, or a legacy system without disrupting the business running on top of it.
How to avoid it: When evaluating CRM migration agencies, ask specifically about past migrations, not just past implementations. Ask what went wrong on a previous project and how they handled it. That answer tells you more than any case study.