A hardiness zone (a subcategory of Vertical Zonation) is a geographically defined area in which a specific category of plant life is capable of growing, as defined by climatic conditions, including its ability to withstand the minimum temperatures of the zone (see the scale on the right or the table below). For example, a plant that is described as "hardy to zone 10" means that the plant can withstand a minimum temperature of -1°C. A more resilient plant that is "hardy to zone 9" can tolerate a minimum temperature of -7°C. First developed for the United States by the Department of Agriculture (USDA), the use of the zones has been adopted by other nations.
Contents |
| Zone | From | To | |
| 0 | a | < −53.9 °C (−65 °F) | |
| b | −53.9 °C (−65 °F) | −51.1 °C (−60 °F) | |
| 1 | a | −51.1 °C (−60 °F) | −48.3 °C (−55 °F) |
| b | −48.3 °C (−55 °F) | −45.6 °C (−50 °F) | |
| 2 | a | −45.6 °C (−50 °F) | −42.8 °C (−45 °F) |
| b | −42.8 °C (−45 °F) | −40 °C (−40 °F) | |
| 3 | a | −40 °C (−40 °F) | −37.2 °C (−35 °F) |
| b | −37.2 °C (−35 °F) | −34.4 °C (−30 °F) | |
| 4 | a | −34.4 °C (−30 °F) | −31.7 °C (−25 °F) |
| b | −31.7 °C (−25 °F) | −28.9 °C (−20 °F) | |
| 5 | a | −28.9 °C (−20 °F) | −26.1 °C (−15 °F) |
| b | −26.1 °C (−15 °F) | −23.3 °C (−10 °F) | |
| 6 | a | −23.3 °C (−10 °F) | −20.6 °C (−5 °F) |
| b | −20.6 °C (−5 °F) | −17.8 °C (0 °F) | |
| 7 | a | −17.8 °C (0 °F) | −15 °C (5 °F) |
| b | −15 °C (5 °F) | −12.2 °C (10 °F) | |
| 8 | a | −12.2 °C (10 °F) | −9.4 °C (15 °F) |
| b | −9.4 °C (15 °F) | −6.7 °C (20 °F) | |
| 9 | a | −6.7 °C (20 °F) | −3.9 °C (25 °F) |
| b | −3.9 °C (25 °F) | −1.1 °C (30 °F) | |
| 10 | a | −1.1 °C (30 °F) | +1.7 °C (35 °F) |
| b | +1.7 °C (35 °F) | +4.4 °C (40 °F) | |
| 11 | a | +4.4 °C (40 °F) | +7.2 °C (45 °F) |
| b | +7.2 °C (45 °F) | +10 °C (50 °F) | |
| 12 | a | +10 °C (50 °F) | +12.8 °C (55 °F) |
| b | > +12.8 °C (55 °F) | ||
The hardiness zones are informative: the extremes of winter cold are a major determinant of whether a plant species can be cultivated outdoors at a particular location; however, the USDA hardiness zones have a number of drawbacks if used without supplementary information.
The zones do not incorporate summer heat levels into the zone determination; thus sites which may have the same mean winter minima, but markedly different summer temperatures, will be accorded the same hardiness zone. An extreme example of this phenomenon is seen when comparing the Shetland Islands and southern Alabama, which are both on the boundary of zones 8 and 9 and share the same winter minima, but little else in their climates. In summer, the humid subtropical climate of Alabama is about 20 degrees Celsius hotter than the Maritime Subarctic climate of Shetland, and there are few similar plants that can be grown at both locations. Due to its maritime climate, the UK is in AHS Heat Zone 2 (having 1 to 8 days hotter than 30 degrees Celsius) according to the AHS (American Horticultural Society), whereas Alabama is in Zones 7 to 9 (61 to 150 days hotter than 30 degrees Celsius). Users need to combine the hardiness zone with the heat zone to gain greater understanding of what can be grown in a particular location.
Another issue is that the hardiness zones do not take into account the reliability of the snow cover. Snow acts as an insulator against extreme cold, protecting the root system of hibernating plants. If the snow cover is reliable, the actual temperature to which the roots are exposed will not be as low as the hardiness zone number would indicate. As an example, Quebec City in Canada is located in zone 4, but can rely on an important snow cover every year, making it possible to cultivate plants normally rated for zones 5 or 6. But, in Montreal, located to the southwest in zone 5, it is sometimes difficult to cultivate plants adapted to the zone because of the unreliable snow cover.
Other factors that affect plant survival, though not considered in hardiness zones, are soil moisture, humidity, the number of days of frost, and the risk of a rare catastrophic cold snap. Some risk evaluation – the probability of getting a particularly severe low temperature – often would be more useful than just the average conditions.
Lastly, many plants may survive in a locality but will not flower if the day length is insufficient or if they require vernalization (a particular duration of low temperature). With annuals, the time of planting can often be adjusted to allow growth beyond their normal geographical range.
An alternative means of describing plant hardiness is to use "indicator plants" (the USDA also publishes a list of these to go with the hardiness zone map). In this method, common plants with known limits to their range are used.
Gardening books are available that provide more information on climate zones. For example, Sunset Books (associated with Sunset Magazine) publishes a series that break up climate zones more finely than the USDA zones. They identify 45 distinct zones in the US, incorporating ranges of temperatures in all seasons, precipitation, wind patterns, elevation, and length and structure of the growing season.[1]
Owing to the moderating effect of the Gulf Stream on the Irish and British temperate maritime climate, Britain, and Ireland even more so, have milder winters than their northerly position would otherwise entail. This means that the hardiness zones relevant to Britain and Ireland are quite high, from 7 to 10, as shown below.
Central Europe's climate is a good example of a transition from an oceanic climate to a continental climate, which can be noticed immediately when looking at the hardiness zones, which tend to decrease mainly eastwards instead of northwards. Also, the plateaux and low mountain ranges in this region have a significant impact on how cold it might get during winter. Generally speaking, the hardiness zones are high considering the latitude of the region, although not as high as in the Shetland Islands where zone 9 extends to over 60°N. In Central Europe, the relevant zones decrease from zone 8 on the Belgian and Dutch coasts, as well as some of the Frisian Islands and the island of Heligoland, to zone 5 on the far eastern border between Poland and Belarus. Some isolated, high elevation areas of the Alps and Carpathians may even go down to zone 3 or 4. An extreme example of a cold sink is Funtensee, Bavaria which is at least in zone 3 and maybe even in zone 2.
Scandinavia lies at the same latitude as Alaska or Greenland, but the effect of the warm Gulf Stream is even more pronounced here than it is in Britain and Ireland. Save for a very small spot near Karasjok, Norway which is in zone 2, nowhere in the Arctic part of Scandinavia does it get below zone 3. The Faroe Islands, at 62-63°N are in zone 8, as are the outer Lofoten Islands at 68°N. Tromsø, a coastal city in Norway at 70°N, is in zone 7, and even Longyearbyen, the northernmost true city in the world at 78°N, is still in zone 5. All these coastal locations have one thing in common, though, which are cold, damp summers, with temperatures rarely exceeding 20°C, or 15°C in Longyearbyen. This shows the importance to take heat zones into account for a better understanding of what may or may not grow.
In Sweden and Finland generally, at sea level to 500 metres, zone 3 is north of the Arctic Circle, including cities like Karesuando, Pajala and Rovaniemi. Kiruna is the big exception here, which being located on a hill above frost traps, is in zone 5. Zone 4 lies between the Arctic Circle and about 64-65°N, with cities such as Oulu and Jokkmokk, Zone 5 (south to 61-62°N) contains cities such as Tampere, Umeå and Östersund. Zone 6 covers the south of mainland Finland, Sweden north of 60°N, and the high plateau of Småland further south. Here one will find cities such as Gävle, Örebro, Sundsvall and Helsinki. The Åland Islands, as well as coastal Southern Sweden, and the Stockholm area are in zone 6. The west coast of Sweden (Gothenburg and southwards) enjoys particularly mild winters and lies in zone 7, therefore being friendly to some hardy exotic species (The Botanical Garden of Gothenburg), the southeast coast of Sweden has a colder winter due to the absence of the Gulf Stream.
The table herein provides hardiness zone data for some European cities (based on climatological data) [1] [2]:
Based on the average annual minimum temperature for a given location, the USDA map provides an easy guideline for categorizing locations suitable for winter survival of a rated plant in an "average" winter. Since temperatures in the non-coastal-adjacent areas of the continent rarely present a consistent experience from year to year, and occasionally present a major—and often agriculturally devastating—deviation from the average minimum, the map has limitations for much of the country as a basis for using with long-term reliability, at least in areas close to the margin of a plant's rated hardiness-zone.
The USDA first issued its standardized hardiness zone map in 1960, and revised it in 1965. A new map was issued in 1990, based on U.S. and Canadian data from 1974 through 1986 (and 1971–1984 for Mexico). The 1990-issue map was based on nearly double the number of stations, and it divided the temperature zones into five-degree a/b zones for greater accuracy. This revised map identified many areas as colder than did the 1960 map, due chiefly to a number of severely colder winters in the central and eastern U.S. in the 1974–1986 data-gathering period, as opposed to the mid-20th century data-sampling period used in the 1960 map.
The 1990 map shows 10 different zones, each of which represents an area of winter hardiness for the plants of agriculture and the natural landscape. The USDA introduced zone 11, representing areas that have average annual minimum temperatures above 40 °F (4.4 °C) and that are therefore essentially frost-free.
In 2003, the American Horticultural Society (AHS) produced a draft revised map, using temperature data collected from July 1986 to March 2002. This was a period of warmer winters than the 1974–1986 period, especially in the eastern U.S.A. The 2003 map placed many areas approximately a half-zone higher (warmer) than the 1990 map had. Reviewers noted the map zones appeared to be closer to the original 1960 map in its overall zone delineations. The 2003 AHS draft map purported to show finer detail, for example, reflecting urban heat islands by showing the downtown areas of several cities (e.g., Baltimore, Maryland, Washington, D.C. and Atlantic City, New Jersey) as a full zone warmer than outlying areas. The map excluded the detailed a/b half-zones introduced in the 1990 map, an omission widely criticized by horticulturists and gardeners due to the coarseness of the resulting map. The USDA rejected the AHS 2003 draft map; the agency stated it would create its own map in an interactive computer format. As of August 2010 the AHS and the National Arboretum websites still present the 1990 map as current.
In 2006, the US National Arbor Day Foundation completed an extensive updating of U.S. Hardiness Zones. It used essentially the same data as the AHS. Once the Foundation analyzed the new data, it revised hardiness zones, reflecting the generally warmer recent temperatures in many parts of the country. The Foundation's 2006 map appears to validate the data used in the AHS 2003 draft. The Foundation also did away with the more detailed a/b half-zone delineations.[2]
The USDA plant hardiness zones for U.S. cities as based on the draft 2003 map are the following:
The USDA hardiness zones are in use in Australia, but in addition the Australian National Botanic Gardens have devised another system more in keeping with Australian conditions.[3] They are numerically about 7 lower than the USDA system. For example, Australian zone 3 is roughly equivalent to USDA zone 9. The higher Australian zone numbers have no US equivalents.
There are problems with classifications of this type: the spread of weather stations is insufficient to give clear zones and too many places with different climates are lumped together. Only 738 Australian stations have records of more than ten years (one station per 98,491 hectares), though more populated areas have relatively fewer hectares per station. Local factors such as aspect, altitude, proximity to the sea also complicate the matter. For example, Mount Isa has three climatic stations with more than a ten year record. One is in Zone 4a, one in Zone 4b and the other is in Zone 5a. Likewise, Sydney residents can choose between Zones 3a and 4b. Most other cities have similar problems. Different locations in the same city are suitable for different plants, making it hard to draw a meaningful map. There may even be a case for publishing a list of weather stations and their zone classification to allow best use of local conditions.
In addition to the USDA Hardiness zones there are the American Horticultural Society (AHS) Heat Zones.
The criterion is the average number of days per year when the temperature exceeds 30°C(86°F) [3]. The AHS Heat Zone Map for the US is available here [4].
| Zone | From | To |
| 1 | < 1 | |
| 2 | 1 | 7 |
| 3 | 8 | 14 |
| 4 | 15 | 30 |
| 5 | 31 | 45 |
| 6 | 46 | 60 |
| 7 | 61 | 90 |
| 8 | 91 | 120 |
| 9 | 121 | 150 |
| 10 | 151 | 180 |
| 11 | 181 | 210 |
| 12 | >210 | |