What your state allows
Updated
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Cottage food is a real possibility here
Unlike an acidified sauce, a syrup is often on a state cottage food list, because its safety rests on sugar concentration rather than on a process somebody has to supervise. That is a genuine door and it is worth asking about specifically rather than assuming the answer from another craft.
The maple states add their own rules
States with a maple industry regulate it in detail: density, grade naming, what may be called maple, container marking and sometimes licensing. Vermont, for one, sets packaged syrup at a minimum of 66.9 degrees Brix at 60 °F, which is above the federal 66 percent floor. A producer working to the federal number in that state is below the state one.
Ask about the venue, not only the product
A farmers market, a retail shelf, a restaurant and mail order across a state line can sit differently even for the same bottle. Describe the whole plan, including the part you have not started, because the answer about making it does not settle the answer about selling it.
Record who told you what
Name, date, what you described and what they said. Staff change and guidance gets restated, and being able to point at a specific conversation is a different position from remembering that somebody said it was fine.
Nothing here is a determination
This property is written from federal regulation, one state regulation and published extension guidance. It is the starting point for that conversation rather than a substitute for it.
Ask in the quiet part of the year
For a seasonal syrup the whole conversation has to happen before the season, because during it there is no time and afterwards the product already exists. The same applies to anything with a queue attached: a license, an inspection, a label review. None of those move faster because the sap is running.