How to create 'Free Shipping' using USPS Ground only

Topic summary

Goal: Offer free shipping only via USPS Ground nationwide during February. Current setup uses multiple UPS and USPS rates; a simple free-shipping-by-order-value rule leads to unintended outcomes (East Coast buyers get free UPS 3‑day, West Coast doesn’t see free shipping due to higher costs).

Key constraint: Shopify’s native shipping settings cannot restrict free shipping to a specific carrier/service (USPS Ground) on their own.

Proposed solutions:

  • Multi Carrier Shipping Label app: Apply a -100% price adjustment exclusively to USPS Ground rates so they appear free, while other services show actual rates. If USPS Ground isn’t available for a location, the free option won’t appear.
  • ShipMagic app (starter plan): Can implement this behavior; advised to contact app support for exact setup.

Status/outcome: Original poster acknowledged the advice with thanks. No confirmation of implementation; effective path appears to be using third‑party apps rather than a native Shopify solution.

Summarized with AI on January 6. AI used: gpt-5.

Hello,

I am offering FREE SHIPPING on my website for the month of February. My question is how can I create “free shipping” only using USPS Ground rates? I have consumers buying from different parts of the country. I tried to use a dollar amount but the problem is if you live in the East coast, it gives you the option of 3 day shipping with UPS (which I don’t want to do) and if you live in the West coast the amount doesn’t show up as free shipping since costs are more expensive shipping from East to West coast.

Any suggestions? I’m currently using rates from UPS (3 rates) and USPS (2 rates).

Thanks!

It may not be possible with Shopify Shipping.

If you are using an app like the Multi Carrier Shipping Label app to offer USPS carrier-calculated rates, which includes an option for price adjustments, you may apply a -100% adjustment only to USPS Ground Rates.

This way, free shipping will be offered only for USPS Ground rates; for all other services, actual rates will be offered at checkout. Additionally, if USPS Ground Service is not available at any location, the free USPS Ground service will not be offered.

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This is not possible in Shopify natively. However, you can use our ShipMagic app’s starter plan to do this. You can reach out to the customer support for exact details on how to setup the app for your usecase.

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Thank you!

Thank you!