When should a northern red oak be pruned?

Carmel Urban Forestry publishes an approved species list (last revised 3/28/2024) whose "Undesirable Trees" section reads like a field guide to what fills older Hamilton County streets: silver maple (shallow roots, weak wood), Callery pear, pin oak, red maple and all Fraxinus for emerald ash borer. Approved large street trees run to swamp white oak, bur oak, chinkapin oak, hackberry, male-only ginkgo, thornless honeylocust, Kentucky coffeetree, baldcypress and London planetree; note Callery pear is discouraged locally but is not yet banned in Indiana — 312 IAC 18-3-25 currently lists 44 species without it. That context matters for northern red oak: northern red oak is the big shade tree most central indiana properties inherited from the woodlot their subdivision was cut out of, and it is the species where the calendar matters more than the cut — indiana sits squarely in oak wilt territory and red oak is in the highly susceptible red/black oak group. Removing a northern red oak around Carmel runs roughly $400–$1,900, and in Village of WestClay, Brookshire and Woodland Springs access is usually what decides where in that range you land.