I would imagine you call it a Jasmine tree based on the blooms? It would most likely not be an actual jasmine tree. There are a few trees sharing that common name and they are all tropical, minimum cold hardiness from Zone 9b -3.9 °C (25 °F) to -1.1 °C (30 °F) to Zone 10a -1.1 °C (30 °F) to +1.7 °C (35 °F)
You would have to show photos of the entire tree with leaves, trunk, and blooms to get a correct ID.
Jasmin plants are the same although I found some listed at Zone 8a -12.2 °C (10 °F) to -9.4 °C (15 °F) and one at Zone 7a -17.8 °C (0 °F) to -15 °C (5 °F)
Confederate Jasmine (Trachelospermum jasminoides 'Variegatum')