What period of time did Robert Frost write most his poetry?

Robert Frost wrote most of his poetry during the early to mid 20th century. While he began writing in the late 19th century, his most famous works were published between 1914 and 1960. This period saw him publish collections like:

* A Boy's Will (1913)

* North of Boston (1914)

* Mountain Interval (1916)

* New Hampshire (1923)

* West-Running Brook (1928)

* A Further Range (1936)

* A Witness Tree (1942)

* In the Clearing (1962)

It's worth noting that Frost continued writing and publishing poetry until his death in 1963, but the majority of his most recognized and celebrated work falls within the period mentioned above.