Canadian populations of Green-winged Teal are at least moderately well monitored by four programs. The western population is best monitored by the Waterfowl Breeding Population and Habitat Survey (WBPHS), which is highly suitable, covers much of the range, and has high precision. The Eastern Waterfowl Survey (EWS) is considered to be most representative for the eastern population, as it provides moderate coverage of the breeding range, but has high suitability and precision. although it only dates back to 1990. The national population is also monitored by the Breeding Bird Survey (BBS), which has high suitability and precision but only moderate coverage, and the Christmas Bird Count, which has high precision, but only moderate coverage because fewer than half of the birds sampled at the continental scale are from the Canadian population. The BBS, CBC, and WBPHS all have moderate overall reliability at the national scale, but the BBS is considered the best source among them as it likely samples the broadest cross-section of the population. The WBPHS shows a moderate increase of 60% relative to 1970, while the BBS shows little change (-13%) and the CBC indicates a large decline of 61% over the same period, indicating considerable uncertainty around the national trend. The EWS indicates little change in the eastern population.

The national goal for Green-winged Teal is to remain at or above its average population level from 1970 to 2022, based on the Breeding Bird Survey. Recent data show that the population is within its goal range.

The goal for the western population of Green-winged Teal is to maintain a population of 1.5 million individuals within the area covered by the Waterfowl Breeding Population and Habitat Survey. This is based on the North American Waterfowl Management Plan's goal of 2,059,000 individuals across the survey's full range, but adjusted to reflect the average proportion of the breeding population in Canada (74%). The western population of Green-winged Teal is within its goal range.

The goal for the eastern population of Green-winged Teal is to maintain a population of 260,000 individuals within the area covered by the Eastern Waterfowl Survey. The latest results from this program indicate that the population is below its goal.