About the author:
Robert Frost (1874-1968) was an American poet noted for his realistic descriptions of rural life. Some of his famous works are The Road Not Taken, West Running Brook, Mending Wall, After Apple Picking, etc.
The poet is in the forest, but just going through it. He first admires who owns these woods. Also, he tells us that he thinks he does know who owns them. The owner lives in a house in the village. So, the poet won't get into trouble for violating and passing through the woods, because there's no one to catch him while he is travelling through.
The poet is travelling on a horse, and it is little now. The poet studies the mind of his little horse and assumes that it must think it's pretty strange for them to be stopping in the middle of nowhere, with no one in sight, with not even a farmhouse close by. The poet and his little horse are very cold between the woods and a frozen lake. Also, he thinks it to be the darkest evening of the year.
Little horse was feeling something odd. The poet has a belt tied on the neck of a horse to control it, and he gives them a little shake to get his master's attention. The only other sounds are of a slight wind and falling snow. It was so quiet.
The poet admits to having a strong desire to have or do something for the dark woods, but he tells us he's got more things to do, people to see and places to visit. He's got a long way to go before he can rest or sleep, so he had better get going.