Is the poem "The Silken Tent" by Robert Frost a sonnet?

Yes, "The Silken Tent" is most definitely a sonnet--and I
didn't realize that Robert Frost wrote sonnets!

The poem
has all the elements of a Shakespearean sonnet:

a) 14
lines;

b) iambic pentameter: each line contains five
repetitions that "move" in a dah-DAH-dah-DAH pattern;

c)
the rhyme scheme is abab cdcd efef
gg.

The poem consists of an extended metaphor,
sometimes known as a "conceit." The poet's lover is compared to "silken tent" that has
been set up in a field.

The tent's "supporting central
cedar pole" seems to stand almost by itself, without the help of "any single cord." 
This "signifies the sureness of the soul"--the lover's confident self-reliance.  The
poem's original title was  “In Praise of Your Poise.”

The
lover is independent but not aloof.  She is

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loosely bound
By countless silken ties
of love and thought
To every thing on
earth

Although Frost uses the
sonnet, a very old form of poetry, his language in the poem is simple and
modern.