![]() ![]() This hardiness is normally lost gradually in late winter as temperatures warm and days become longer. Many species of plants gradually acquire cold hardiness in the fall when they experience shorter days and cooler temperatures. No hardiness zone map can take the place of the detailed knowledge that gardeners pick up about their own gardens through hands-on experience. You also could have pockets within your garden that are warmer or cooler than the general zone for your area or for the rest of your yard, such as a sheltered area in front of a south-facing wall or a low spot where cold air pools first. Your entire yard could be somewhat warmer or cooler than the surrounding area because it is sheltered or exposed. Individual gardens also may have very localized microclimates. Microclimates, which are fine-scale climate variations, can be small heat islands-such as those caused by blacktop and concrete-or cool spots caused by small hills and valleys. In addition, although this edition of the USDA PHZM is drawn in the most detailed scale to date, there might still be microclimates that are too small to show up on the map. Gardeners should keep that in mind when selecting plants, especially if they choose to "push" their hardiness zone by growing plants not rated for their zone. Hardiness zones are based on the average annual extreme minimum temperature during a 30-year period in the past, not the lowest temperature that has ever occurred in the past or might occur in the future. What is thriving in your yard will most likely continue to thrive. If your hardiness zone has changed in this edition of the USDA Plant Hardiness Zone Map (PHZM), it does not mean you should start pulling plants out of your garden or change what you are growing. Since 2020 Yukon uses UTC-7h or Yukon Standard Time all year round.Map & Data: USDA Agricultural Research Service ( / Oregon State University ( Southampton Island remains on Eastern Standard time all year long. Nunavut covers 3 time zones and all zones change at 02:00 local time. Areas around Lloydminster are in the Mountain Time zone and change at 2:00 a.m. Most of Saskatchewan uses Central Standard time all year round. The areas of Ontario, west of 90° West longitude, are in the Central Time zone and change at 2:00 a.m. Return to first footnote 2 referrer Footnote 3 Some areas of Quebec east of 63° West longitude use Atlantic Time for all or part of the year. Prior to November 2011, Newfoundland changed time at 00:01 local time. (This has been denoted as serial number #07 as is transmitted in CHU code.) Province/Territory The time zone maps and the dates listed below have been in effect since 2020. Exceptions may exist in certain municipalities. When does daylight saving time start and end?ĭaylight saving time in Canada is determined by provincial legislation. These boundaries and changeover dates have serial number 07, broadcast in computer readable form on short wave station CHU along with Canada's official time reference UTC (NRC): Coordinated Universal Time, the modern implementation of Greenwich Time.Ī major change in official time practice will be given a new serial number and documented here. Starting in 2007, clocks following the new North American standard for Daylight Saving Time are to be turned forward by one hour on the second Sunday in March and turned back on the first Sunday of November. In Canada, Time Zones and Daylight Saving Time usually have been regulated by provincial and territorial governments. The times for the start and end of Daylight saving time in Canadian time zones can be found here.
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