# Can you combine two xgboost models into one?

If you have built two different xgbost models, with say 100 trees each, is it possible to combine into an xgboost model with 200 trees?

• @NextDoorEngineer I'm not sure what you mean. If you mean passing the xgb_model parameter to train or fit methods, that's training continuation: the new trees are fitted as though you were continuing to train that old model with more trees (not starting from scratch). – Ben Reiniger Mar 31 at 16:23