The Kinsta link below is an ordinary product link, not an affiliate tracking link. See our affiliate disclosure for details.
Migrating one site with downtime tolerance is a weekend task. Migrating 20+ client sites, each with its own domain, its own client stakeholder, and its own tolerance for a bad Tuesday, is a project — and the agencies that get through it clean treat it as a batch operation with a repeatable template, not as 20 separate one-off migrations.
Despite the title’s downtime goal, zero downtime is not guaranteed. Kinsta’s assisted migrations take place Monday through Friday, not on weekends. Its guidance calls for maintenance planning for e-commerce, membership, and community sites to prevent data loss. Separate the copying window, review time, and DNS cutover when planning each client’s availability. See the official Kinsta migration procedure (accessed September 14, 2026).
Batch the sites before you batch the work
Not all 20 sites carry the same risk. Before scheduling anything, sort the roster into three tiers: low-risk brochure sites with no forms or transactions, medium-risk sites with contact forms or booking tools, and high-risk sites with e-commerce or membership/login functionality. Migrate the low-risk tier first — it validates your process and surfaces template-level issues (a shared plugin, a shared theme, a shared page builder quirk) before you touch anything where a mistake actually costs the client money.
Build one migration template, then run it 20 times
If your client roster shares a common stack — the same page builder, the same handful of plugins, the same rough site structure — document the exact migration sequence once: audit platform-specific plugins, prepare access and an available site slot, agree on a content freeze or maintenance plan, migrate, preview and test the copied site, update DNS, and verify after cutover. Treat every site as an instance of that template. For Kinsta-assisted migrations, wait for the team’s completion confirmation and finish testing before making the copied site live. Changes made after migration starts do not carry over; if updates occur or launch is delayed, a second migration may be needed.
Stagger DNS TTL drops across the whole batch, early
Lowering TTL helps speed DNS propagation; it does not prevent all downtime or preserve orders written after the site was copied. Kinsta recommends reducing TTL to 300 seconds 12–24 hours before migration, then increasing it to around 3600 seconds after launch. Its instructions say Cloudflare users do not need to change TTL. Add a per-domain preparation time to the batch schedule instead of assuming one change makes every site ready. Keep data freeze, testing, and DNS readiness as separate checks. Source: Kinsta’s downtime-minimization guidance (accessed September 14, 2026).
Schedule cutovers in a low-traffic window per site, not per project
“Migrate everything overnight” sounds efficient but concentrates risk — if something in your template breaks on site 14, you’re now debugging under time pressure with 6 more sites in the queue. Instead, schedule cutovers spread across several nights or early mornings, in each site’s own lowest-traffic window (which won’t be identical for a US client and a client with international traffic), with enough gap between batches to confirm the previous batch is stable before starting the next.
For assisted migrations, coordinate those windows with Kinsta’s weekday schedule and assign someone who can test immediately after completion. For continuously updated sites, agree on maintenance timing before the copy starts. If maintenance mode is not possible, discuss alternatives with support before scheduling the batch.
Use Kinsta’s bulk tooling where it exists, but verify per site anyway
Kinsta’s documentation directs customers with many WordPress sites to contact support for a bulk migration. Migration status is available in MyKinsta under Sites > Migrations. Assisted migration does not remove the need for a real per-site QA pass: form submission tests, checkout flow tests where applicable, and a visual comparison against the pre-migration site. Assign an agency owner for DNS, third-party services, and email setup, because these are not included in the migration service.
What to tell clients before you start
Use a standard notice template, but fill in each site’s approved timing and restrictions. Do not promise every client a maintenance window under an hour. Kinsta’s guidance for frequently updated sites describes migration and review as separate stages and says the original site remains in maintenance mode until DNS has propagated. Confirm the applicable window with the migration team before communicating it.
Suggested notice: “Your hosting migration is scheduled for [date, time, and timezone]. During [agreed window], [affected actions] will be unavailable or paused. [Named owner] will test the migrated site before DNS cutover and send the next update at [time]. We will confirm completion after verification; this is not a guaranteed downtime duration.” For a brochure site, specify the editing freeze. For a store or membership site, specify which customer actions will pause and who authorizes reopening.
The bottom line for large-batch migrations
Twenty-plus site migrations need repeatable checks and site-specific timing. Tier the roster by risk, build the sequence once, prepare DNS in advance where applicable, and stagger cutovers so a single site’s problem does not become a whole-roster incident. A manual migration can be sufficient when your team can manage copying, data consistency, preview testing, and cutover itself. Kinsta hosting is a paid destination to consider when its hosting service fits your requirements; purchasing hosting does not mean you must also purchase an expedited migration. The official migration overview states that unlimited free migrations are available from all providers for standard WordPress installations (accessed September 14, 2026). Confirm eligibility and special requirements for your roster.
Start the batch conversation with Kinsta‘s migrations team to confirm site slots, weekday scheduling, maintenance needs, and the work your agency must handle. Prepare the stop conditions and recovery responsibilities with our migration rollback checklist before agreeing to client windows.
Related reading: Kinsta vs Cloudways for Agencies: Which Wins on Client-Site Management? and Migrating from WP Engine to Kinsta: Step-by-Step Checklist.