USDA Hardiness Zone 4B Growing Guide
Source: USDA Agricultural Research Service Plant Hardiness Zone Map 2023
Upper Midwest and northern New England valleys — wider variety of fruit and vegetables.
Where Zone 4B sits on the national map
Zone 4B highlighted in dark green; neighboring zones in their reference colors. Tap a neighboring zone to compare.
Source: USDA ARS Plant Hardiness Zone Map 2023 · PRISM Climate Group, Oregon State University · 1991-2020 normals
Zone Position
Key Facts — Zone 4B
- Avg. coldest night: -25°F to -20°F (-31.7°C to -28.9°C) — the band of average annual extreme minimum temperatures that defines this zone (USDA ARS PHZM 2023)
- What that means: in an average year your coldest night lands somewhere in that 5°F window. Actual lows can drop colder in extreme winters; daytime highs are not bounded by this number.
- Found In: 22 US states, including New York, Colorado, Oregon and 19 more
- Growing Considerations: Upper Midwest and northern New England valleys — wider variety of fruit and vegetables.
What Is Zone 4B?
USDA Hardiness Zone 4B is defined by an average annual extreme minimum temperature between -25°F and -20°F (-31.7°C to -28.9°C), according to the USDA ARS Plant Hardiness Zone Map 2023.
Coldest avg. low
-25°F
USDA PHZM 2023
Warmest avg. low
-20°F
USDA PHZM 2023
Coldest avg. low (°C)
-31.7°C
USDA PHZM 2023
States
22
Where Is Zone 4B Found?
Zone 4B appears across 22 states:
Plants That Thrive in Zone 4B
Plants well-adapted to the temperature range of this zone.
Grape (cold-hardy)
Plum
Asparagus
Pear
Your Zone Is Just One Factor
Hardiness zone tells you about winter cold tolerance — but it doesn't tell you about soil drainage, summer heat, frost dates, flood risk, or contamination proximity. Two Zone 4B parcels can have very different growing outcomes. Your Growable Ground report scores 1,112 plants against all these factors for your specific address.
Your zone is a starting point — your parcel is the whole story
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Frequently Asked Questions
What plants grow in Zone 4B?
Upper Midwest and northern New England valleys — wider variety of fruit and vegetables. Common plants that thrive include Grape (cold-hardy), Plum, Asparagus, Pear. Actual suitability depends on your parcel's soil, drainage, and microclimate.
What states have Zone 4B?
Zone 4B appears across 22 US states: New York, Colorado, Oregon, Washington, Alaska, Arizona, Idaho, Iowa, Maine, Michigan, Minnesota, Montana, Nebraska, Nevada, New Hampshire, New Mexico, North Dakota, South Dakota, Utah, Vermont, Wisconsin, Wyoming.
What temperature is USDA Zone 4B?
USDA Hardiness Zone 4B is defined by an average annual extreme minimum temperature between -25°F and -20°F (-31.7°C to -28.9°C), per the USDA ARS Plant Hardiness Zone Map 2023.