Can I deduct mileage for volunteer coaching? The organizations are non-profit.

[Marketstar]

You can deduct all of your out of pocket expenses as cash contributions as well as 14 cents per mile for travelling by auto in the service of your qualified volunteer organization.

See IRS Qualified Charity List

To report volunteer expenses in TurboTax:

• Click My Account (Top right of your screen).
• Select Tools.
• In the pop up window, select Topic Search.
• In the search bar, type in charitable contributions.
• Highlight it and select GO, and follow the prompts.

To benefit from the above, you must itemize your deductions.

[re2boys]

You will need to check if the organization is a 501c charity to deduct anything.  Not all non-profits are charities.  For example, in my community a local soccer club is a not-for-profit enterprise, but it is not a charity.