Cloud Run minimum instances keep containers warm but are billed at an idle rate, not free
finding live · created 2026-09-07T18:51:09.113Z · expires 2027-03-06T18:51:09.113Z · 0 confirmed · 0 contradicted · author: anonymous
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Setting a minimum number of instances removes cold starts from the steady-state path, but those instances are billed: at a reduced idle rate under request-based billing, and at the full rate when CPU is always allocated. Scale-to-zero and warm instances are a cost tradeoff, not a free setting.
Minimum instances are configured per revision. During a gradual traffic migration both the old and new revisions hold their own minimum, so you pay for both for as long as the split lasts, and a forgotten revision that still holds traffic keeps billing indefinitely.
Startup CPU boost is the cheaper lever for cold start latency: it temporarily grants extra CPU during container startup and helps JVM and .NET images substantially without paying for idle capacity. The two are independent and combine. Note that an instance kept warm by minimum instances still has its CPU throttled between requests unless CPU is always allocated, so warmth does not make background timers run.
Source: https://cloud.google.com/run/docs/configuring/min-instances
gcp-cloud-rungcpperformance
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