Deconstruct SunBozeman, MT: Hardiness Zone 5a & Sunlight by Season
Bozeman is in USDA hardiness zone 5a. Here’s what that means for winter, plus sunrise, sunset, daylight hours and the sun’s path through the year.
Zone 5a in Bozeman
On the 2023 USDA Plant Hardiness Zone Map, Bozeman falls in zone 5a. That means the coldest night of a typical winter drops to between −20 and −15 °F. Perennials, shrubs and trees labeled for zone 5a or colder (a lower number) should survive the winter here.
A zone only covers winter cold. For a plant to do well it also needs the right amount of sun, and that varies far more from one corner of a yard to the next than the zone does across town.
This is not the official USDA Plant Hardiness Zone Map. Zones are derived from the official 2023 dataset, resampled to about 2 km.
Nearby cities
- Butte, MT Zone 4a
- Helena, MT Zone 5a
- Billings, MT Zone 5a
- Great Falls, MT Zone 4b
- Jackson, WY Zone 4b
- Idaho Falls, ID Zone 5b
- Missoula, MT Zone 5b
- Pocatello, ID Zone 6a
The sun over Bozeman
On the June solstice the sun rises in the northeast at 5:34 AM and climbs to 68° above the horizon at 1:26 PM. On the December solstice the noon sun reaches only 21°, so a 20-foot tree casts a noon shadow about 52 feet long. In June the same tree’s noon shadow is only 8 feet.
Sunrise, sunset & daylight by month
| Date | Sunrise | Sunset | Daylight | Noon sun |
|---|---|---|---|---|
| Jan 21 | 7:56 AM | 5:14 PM | 9h 18m | 25° |
| Feb 21 | 7:16 AM | 5:59 PM | 10h 44m | 34° |
| Mar 21 | 7:25 AM | 7:38 PM | 12h 13m | 45° |
| Apr 21 | 6:27 AM | 8:18 PM | 13h 51m | 56° |
| May 21 | 5:46 AM | 8:55 PM | 15h 09m | 65° |
| Jun 21 | 5:34 AM | 9:17 PM | 15h 43m | 68° |
| Jul 21 | 5:55 AM | 9:05 PM | 15h 10m | 65° |
| Aug 21 | 6:32 AM | 8:21 PM | 13h 50m | 56° |
| Sep 21 | 7:10 AM | 7:23 PM | 12h 13m | 45° |
| Oct 21 | 7:49 AM | 6:27 PM | 10h 39m | 33° |
| Nov 21 | 7:32 AM | 4:47 PM | 9h 16m | 24° |
| Dec 21 | 8:02 AM | 4:42 PM | 8h 41m | 21° |
Local time (Denver), including daylight saving time. “Noon sun” is the sun’s height above the horizon at solar noon.
Daylight through the year
What “full sun” means in Bozeman
Full sun is 6+ hours of direct sun. In Bozeman an open spot has 15.7 hours of daylight to work with in June and 8.7 in December, so a bed that clears 6 hours in summer can easily drop to part shade in winter once the low sun slips behind trees and houses.
Measure the sun in your Bozeman yard
Daylight is the ceiling. Deconstruct Sun traces the trees and buildings around one exact spot and tells you its real direct-sun hours, today and at every solstice and equinox.
Questions
What hardiness zone is Bozeman, MT in?
Bozeman, Montana is in USDA plant hardiness zone 5a on the 2023 map. The average coldest winter night is −20 to −15 °F (−28.9 to −26.1 °C).
How many hours of daylight does Bozeman get?
About 15.7 hours on the June solstice (sunrise 5:34 AM, sunset 9:17 PM) and 8.7 hours on the December solstice (sunrise 8:02 AM, sunset 4:42 PM). Around the equinoxes it is close to 12 hours.
How many hours of sun does my Bozeman yard get?
Up to the daylight hours above, minus whatever trees, buildings and fences block. In winter, when the sun stays low, that can be most of it. The Deconstruct Sun iPhone app measures the real direct-sun hours for one exact spot by having you trace what is around it.
When is the best time to plant in Bozeman?
Zone 5a tells you which perennials survive winter, not planting dates. For timing, use your local average frost dates from your county extension office, and choose plants rated for zone 5a or colder.
Source: USDA Plant Hardiness Zone Map, 2023. Agricultural Research Service, U.S. Department of Agriculture, planthardiness.ars.usda.gov. Underlying data © PRISM Group, Oregon State University, prism.oregonstate.edu, accessed 2026-08-30. Sun times calculated for 45.683, -111.054.