Breadcrumb Ag Home Extension County Extension Offices Cavalier County Services Page Title Services Body NDSU Extension - Cavalier County offers the following services: Hay Bale Probe Soil Sample Bags Forage Nitrate QuikTest ND Farm Record Books Pressure Canner Tester Infared Thermometer County Extension Office Cavalier County 4-H Events Services Contact Us Widgets Contact Info Cavalier County Mailing address: Address Courthouse, 901 3rd St, Ste 7 Langdon, ND 58249-2457 United States Phone 701-256-2560 Email NDSU.Cavalier.Extension@ndsu.edu URL Visit website Office hours: Monday-Friday 8:30 AM – 4:30 PM