USDA hardiness zones — 2023 map
North Dakota hardiness zones — USDA planting zone map + what to grow
Zones 3a-4b · most of North Dakota is zone 4a · Midwest region
North DakotaUSDA zone range & map
On the 2023 USDA Plant Hardiness Zone Map, North Dakota spans zones 3a-4b. The map shades the state from the far north near the Canadian border (zone 3a) through to the southern Red River and Missouri valleys (zone 4b). The single most common half-zone across the populated state is zone 4a — that is the figure to use if you only remember one number for North Dakota. North Dakota is among the coldest states, with a short season and brutal winters. Cold-hardy, fast-maturing varieties are essential.
| USDA zone range | Zones 3a-4b |
|---|---|
| Most common zone | Zone 4a |
| Coldest area | the far north near the Canadian border (zone 3a) |
| Warmest area | the southern Red River and Missouri valleys (zone 4b) |
| Average last spring frost | mid-May |
| Average first fall frost | late September |
Source: USDA 2023 Plant Hardiness Zone Map (1991-2020 normals). Frost averages: NOAA/NCEI 1991-2020 climate normals. Local ZIP-level zones and frost dates can differ from these statewide figures.
North Dakota hardiness zones by major city
Zones shift across North Dakota with elevation and distance from the coast. Here is the 2023 USDA half-zone for the largest cities:
| City | USDA zone |
|---|---|
| Fargo | Zone 4a |
| Bismarck | Zone 4a |
| Grand Forks | Zone 3b |
| Minot | Zone 3b |
Need your exact zone? Run the ZIP-code zone finder for a precise half-zone and frost dates for your address.
ZIP-code zones in North Dakota
Statewide ranges hide a lot. Tap your area for its exact USDA half-zone, last and first frost dates, and what to plant now:
- Fargo 58102 — Zone 4a
- Fargo (South) 58103 — Zone 4a
- Fargo (Southwest) 58104 — Zone 4a
- Grand Forks 58201 — Zone 3b
- Bismarck 58501 — Zone 4a
- Bismarck (South) 58504 — Zone 4a
- Minot 58701 — Zone 4a
What North Dakota's zone range means for planting
Your hardiness zone tells you which perennials, shrubs, and trees will survive a typical North Dakota winter, and it anchors when tender crops can go outside. Because North Dakota spans 3a-4b, two gardeners in the same state can have very different planting calendars.
- Pick perennials hardy to your local zone. Across most of North Dakota that means at least zone 4a; gardeners in the far north near the Canadian border (zone 3a) should choose hardier plants.
- Anchor tender crops to your frost dates. With a last spring frost around mid-May and first fall frost around late September, set out tomatoes, peppers, and basil after the last frost and protect them before the first.
- Adjust for your microclimate. Urban heat, a south-facing slope, or a cold valley pocket can shift your effective zone and frost dates by a half-zone or more from the statewide figure.
Find your exact zone in North Dakota
The 3a-4b range is statewide. Growli pins your hardiness zone and frost dates to your exact ZIP code and sends a push notification before any forecast frost night for your saved location.
Frequently asked questions
What hardiness zone is North Dakota?
North Dakota spans USDA hardiness zones 3a-4b on the 2023 USDA Plant Hardiness Zone Map. The most common zone — covering the largest share of the populated state — is zone 4a. The coldest areas are the far north near the Canadian border (zone 3a) and the warmest are the southern Red River and Missouri valleys (zone 4b).
When is the last frost in North Dakota?
Across most of North Dakota the average last spring frost falls around mid-May and the first fall frost around late September. These are statewide averages — colder, higher areas run later in spring and earlier in fall, so check a ZIP-level estimate for your exact spot.
What grows well in North Dakota?
North Dakota is among the coldest states, with a short season and brutal winters. Cold-hardy, fast-maturing varieties are essential. Match plants to your local half-zone within the 3a-4b range: choose varieties hardy to at least zone 4a for reliable overwintering, and time tender crops around your local frost dates. The zone 4 planting guide lists vegetables, fruit, and ornamentals suited to most of the state.
Why does North Dakota have more than one hardiness zone?
Hardiness zones track the average annual coldest temperature, which changes with latitude, elevation, distance from water, and urban heat. That is why North Dakota ranges from the far north near the Canadian border (zone 3a) to the southern Red River and Missouri valleys (zone 4b) — a span of 3a-4b — even though it is a single state.
Did North Dakota's hardiness zone change in 2023?
The USDA updated the Plant Hardiness Zone Map in November 2023 using 1991-2020 climate data. About half the country, including parts of North Dakota, shifted to the next warmer half-zone versus the 2012 map. The 3a-4b range here reflects the current 2023 map. Always confirm your address against the official USDA map for plant-survival decisions.