Automate Google Calendar & Trello

Stop paying for mismatched spreadsheets. Sync data between Google Calendar and Trello in real-time, so you can manage your operations without the busywork.

Get This Workflow Built

Custom API Integration

Secure Data Transfer

Done-For-You Setup

How the Data Flows

graph LR
    subgraph Source ["Google Calendar"]
        T1(["Event Cancelled"])
    end
    
    subgraph Middleware ["Enterprise Integration Core"]
        W[CRON API
Poller] --> V{Validation
& Auth}
        V -->|Fail| DLQ[Dead Letter
Queue]
        V -->|Pass| Map[Data Mapping
& Transformation]
        Map --> Retry[Rate Limiting
& Retries]
    end
    
    subgraph Target ["Trello"]
        A1(["Add Attachment to Card"])
    end

    T1 -->|JSON Payload| W
    Retry -->|Authenticated API POST| A1

    style Source fill:transparent,stroke:#cbd5e1,stroke-dasharray: 5 5
    style Target fill:transparent,stroke:#cbd5e1,stroke-dasharray: 5 5
    style Middleware fill:#f8fafc,stroke:#94a3b8,stroke-width:2px
    style T1 fill:#3b82f6,stroke:#fff,stroke-width:2px,color:#fff
    style W fill:#1f2937,stroke:#fff,stroke-width:1px,color:#fff
    style V fill:#1f2937,stroke:#fff,stroke-width:1px,color:#fff
    style Map fill:#1f2937,stroke:#fff,stroke-width:1px,color:#fff
    style Retry fill:#1f2937,stroke:#fff,stroke-width:1px,color:#fff
    style DLQ fill:#ef4444,stroke:#fff,stroke-width:1px,color:#fff
    style A1 fill:#e11d48,stroke:#fff,stroke-width:2px,color:#fff

When Google Calendar and Trello operate independently, project managers often face the challenge of manually transferring event details to Trello cards. For instance, if a team schedules a meeting in Google Calendar, the associated tasks and deadlines may not be reflected in Trello, leading to missed updates. This results in project managers spending hours copying over event details, such as meeting times and attendees, which could be automatically captured and organized within Trello.

Top Ways to Automate Google Calendar & Trello

Automatic Task Creation: Instantly create Trello cards from Google Calendar events, ensuring that every meeting or deadline translates into actionable tasks without manual entry.
Real-Time Updates: Sync changes made in Trello boards directly to Google Calendar, allowing team members to stay informed about task progress and deadlines without the need for constant checking.
Centralized Notifications: Receive consolidated reminders for both Trello tasks and Google Calendar events, helping teams prioritize their workload and manage time effectively.

How to Build the Google Calendar → Trello Sync

Set up a webhook in Google Calendar to listen for 'event.created' and 'event.updated' triggers. This will notify you whenever a new event is created or an existing event is modified.
In the webhook configuration, ensure that the payload includes the 'summary', 'start', 'end', and 'attendees' fields to capture essential event details.
Write a server-side script to handle the incoming webhook requests. Extract the relevant data from the payload, focusing on the 'summary' for the card title, 'start' and 'end' for due dates, and 'attendees' for additional context.
Use the Trello API endpoint POST /1/cards to create a new card in a specified board and list. Format the API request to include the extracted data as follows: { 'name': summary, 'due': start, 'desc': 'Attendees: ' + attendees.join(', ') }.
For updated events, use the Trello API endpoint PUT /1/cards/{id} to update the existing card, ensuring you reference the correct card ID based on your internal mapping.

Developer Warnings & API Gotchas

Ensure that the Trello card IDs are stored securely after creation; otherwise, you may encounter difficulties when trying to update cards for modified events.
Be cautious with time zone discrepancies between Google Calendar and Trello; ensure that the 'start' and 'end' times are converted to UTC before posting to Trello to avoid scheduling conflicts.
If multiple events are created in quick succession, your webhook may process them out of order. Implement a queuing mechanism to handle this issue and ensure that updates to Trello reflect the correct sequence of events.

Supported API Operations

We leverage official, stable endpoints to ensure secure data transfer. No deprecated legacy routes.

When this happens in Google Calendar... Event Cancelled

Do this in Trello Add Attachment to Card
When this happens in Google Calendar... Event Ended

Do this in Trello Add Checklist to Card
When this happens in Google Calendar... Event Ended (Legacy)

Do this in Trello Add Label to Card
When this happens in Google Calendar... Event Start

Do this in Trello Add Member to Board
When this happens in Google Calendar... Fetch Custom Actions

Do this in Trello Add Members to Card

SyncMatrix Experts

Available for Hire

We are an AI-powered automation team. We build custom, reliable API workflows that eliminate manual data entry.

Speak with an Integration Architect

We build custom API workflows that don't hit rate limits.

I can see you're looking at mapping Google Calendar to Trello. Tell me about your current setup—what's the specific bottleneck you're trying to automate right now?