moment.tz.filterYears(UnpackedZone, Number, Number); // UnpackedZone

By default, Moment Timezone includes all the data from the IANA Time Zone Database. This includes data from at least 1900 to 2038. Releases from version 0.5.37 onward include even more data, beyond the year 2400. The data for all these years may not be necessary for your use case.

moment.tz.filterYears can be used to filter out data for years outside a certain range.

var all    = { name : "America/Los_Angeles", abbrs : [...], offsets : [...] untils : [...]};
var subset = moment.tz.filterYears(all, 2012, 2016);
all.untils.length;    // 186
subset.untils.length; // 11

If only one year is passed, it will be used for the start and end year.

var all    = { name : "America/Los_Angeles", abbrs : [...], offsets : [...] untils : [...]};
var subset = moment.tz.filterYears(all, 2012);
all.untils.length;    // 186
subset.untils.length; // 3

Alternatively, one of the smaller pre-built bundles available on the homepage might already fit your needs.