gistfile1.txt

JSON:
[
    {
        team: {
            international_date: false,
            is_coed: false,
            team_name: "foo bar"
        }
    },
    {
        team: {
            international_date: false,
            is_coed: false,
            team_name: "foo bar"
        }
    }
]

C# Class:
[JsonObject("team")]
    public class Team
    {
        [JsonProperty("international_date")]
        public bool InternationalDate { get; set; }

        [JsonProperty("is_coed")]
        public bool IsCoed { get; set; }

        [JsonProperty("team_name")]
        public string TeamName { get; set; }
    }
    
Code:
List<Team> teams = (List<Team>) Newtonsoft.Json.JsonConvert.DeserializeObject<List<Team>>(data);

Not able to test at the moment, but I wonder if you're using [JsonObject] correctly? The docs seem to indicate it doesn't do what you mean it to do here:
http://james.newtonking.com/json/help/index.html?topic=html/SerializationAttributes.htm

Because without that attribute working the way it's implied to work in your code, then your result would be a list of objects that have a "team" property that could be an object of type team.

So if you had:

public class TeamContainer // <-- horrible name, ignore
{
    public Team team { get; set; }
}

Then I think this should work:

List<TeamContainer> teams = (List<TeamContainer>) Newtonsoft.Json.JsonConvert.DeserializeObject<List<TeamContainer>>(data);

So you don't control the JSON format? Looks kind of like an array of objects, each with a team property set to an object with international_date, is_coed, etc.

I bet Aaron's suggestion would work... an alternative if you can change the JSON would be what I've pasted below:
[
{
international_date: false,
is_coed: false,
team_name: "foo bar"

},
{
        international_date: false,
        is_coed: false,
        team_name: "foo bar"
}

]

Remove lines 4,8,11,15 ... no need to explicitly define each team record as your passing an array in for deserialization anyway, each array element is a "team" ..

The JSON array is of anonymous objects each with a team object as a property. The list class needs to match, something like:

        [JsonObject("team")]
        public class Team
        {
            [JsonProperty("international_date")]
            public bool InternationalDate { get; set; }

            [JsonProperty("is_coed")]
            public bool IsCoed { get; set; }

            [JsonProperty("team_name")]
            public string TeamName { get; set; }
        }

        public class TeamWrapper
        {
            [JsonProperty("team")]
            public Team Team { get; set; }
        }
...
    List<TeamWrapper> teams = (List<TeamWrapper>)Newtonsoft.Json.JsonConvert.DeserializeObject<List<TeamWrapper>>(data);

Oops I see @aaronlerch had it already, sorry!