Contact the City you live in and review their requirements.
City of Duluth requires an application and a permit https://duluthmn.gov/csi/residential-projects/fences/
City of Proctor requires an application https://proctormn.gov/building-permits/
City of Cloquet requires application and permit https://www.cloquetmn.gov/our-city/permits-licenses/commercial-residential-public-works-utility-zoning
City of Two Harbors has guidelines https://www.twoharborsmn.gov/city_departments/departments_a_-_l/building_official.php
City of Grand Marais has no information online. Call City Hall (218) 387-1848
Locate your lot lines. When you purchased your home, a plat drawing of your property was prepared by the title company and attached to your title commitment. A plat drawing shows the approximate measurements of the lot lines.
The +/- on the plat drawing means that the lot line is more than or less than a couple of feet (it is not exact). A plat drawing can help locate property pins (if a previous survey was done). You may want to get a Property survey done ($1500/approx.) for exact lines if not able to locate survey pins on plat drawing provided. It is the homeowner erecting the fence’s responsibility to know where the property boundaries are. A dispute as to location of property lines is a civil matter between landowners.
Talk with your neighbors as a courtesy and to maintain a good relationship.
Call before you dig. 811 or (800)252-1166 www.gopherstateonecall.org