❄️ FARGO ND · CASS COUNTY · 54-IN FROST · LAKE AGASSIZ CLAY · AIR-ENTRAINED · ND SBC 2023
FargoConcrete Calculator — Yards, Bags & Cost
Calculate cubic yards, bags needed, and Cass County–accurate ready-mix costs for any Fargo project — driveways, 54-inch frost footings, Red River Valley clay foundations, basements & more.
$168
Avg Fargo Ready-Mix per Cu Yd
54 in
Frost Depth — Deepest Major US City
5–7%
Air Entrainment — Required All Exterior
3,000
Min PSI — Fargo Standard Flatwork
The Fargo Concrete Calculator helps homeowners, contractors, and builders in Fargo, North Dakota estimate cubic yards, bag count, and Cass County ready-mix costs. Fargo is the largest city in North Dakota, situated in Cass County on the Red River of the North — the flattest, largest urban area in the Red River Valley. Ready-mix pricing runs $155–$185/yd in the Fargo-Moorhead metro market. Fargo holds the distinction of having the deepest frost depth of any major US city at 54 inches (4.5 feet) — a local IRC amendment required by North Dakota's extreme continental climate, where January low temperatures average -8°F. Fargo sits atop the bed of ancient Glacial Lake Agassiz — deep deposits of fine, expansive Red River Valley clay that shrink and swell with moisture changes, cracking foundations and heaving slabs seasonally. Air-entrained concrete (5–7%) is mandatory for all exterior concrete under ND State Building Code 2023 — Fargo averages 100–130 freeze-thaw cycles per year. The City of Fargo Building Inspections Division issues all structural permits.
❄️ Fargo ND · Cass County · 54-in Frost · Lake Agassiz Clay · Air-Entrained · ND SBC 2023
Driveway: 5 in. min, 3,000 PSI air-entrained (5–7%). No permit for private flatwork. Avoid Oct–Apr frozen subgrade. Call North Dakota One Call (811) before digging.
Patio 4–5 in · Driveway 5 in · Garage 5 in · Frost footing 54+ in · Foundation wall 10–12 in · Basement slab 4 in
Cubic Yards Required
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📋 Project Summary
💵 Fargo / Cass County Cost
📐 Fargo Slab & Footing Cross-Section
Cass County · ND SBC 2023 · 54-in Frost Depth — Red River Valley Standard Assembly
Fargo concrete work is governed by two extreme local conditions that have no equal among major US cities: a 54-inch frost depth — the deepest local IRC amendment of any major US city — and Lake Agassiz expansive clay soils that underlie the entire Fargo metro area. Every structural footing and pier must reach 54 inches below finished grade without exception; shallow footings will be destroyed by frost heave within 1–2 winters of Fargo's brutal continental climate, where January lows average -8°F. Fargo sits on the ancient lakebed of Glacial Lake Agassiz — deep fine clay deposits that swell dramatically during spring snowmelt and Red River floods, then shrink and crack in the hot, dry Great Plains summer, placing continuous cyclical stress on every concrete foundation in the city. Air-entrained concrete (5–7%) is mandatory for all exterior work under ND SBC 2023, given Fargo's 100–130 annual freeze-thaw cycles.
⚠️ 54-Inch Frost Depth — The Deepest of Any Major US City
Fargo's local IRC amendment mandates all footings reach 54 inches (4.5 feet) below finished grade. Fargo's continental climate regularly records January lows of -20°F or colder — ground frost penetrates deeply and slowly. Frost heave on a shallow footing exerts tons of upward force that will crack and displace any non-compliant foundation within 1–2 winters. The City of Fargo Building Inspections Division requires a mandatory footing inspection at 54 inches before any structural concrete is placed. No exceptions — never pour structural concrete without a passed footing inspection on file.
✅ City of Fargo Building Inspections — Permit Rules
The City of Fargo Building Inspections Division does NOT require a permit for concrete flatwork (driveways, patios, sidewalks on private property). Permits ARE required for all structural concrete — foundations, basement walls, retaining walls, garages, ADUs, and additions. Mandatory 54-inch footing inspection before structural concrete is placed. Submit permits online via the City of Fargo Permit Portal or contact Building Inspections at (701) 241-1530.
🚗 Fargo Driveway Cost
10×40 ft at 5 in. = ~6.2 yd. At $155–$175/yd → $961–$1,085 material. Specify 3,000 PSI air-entrained (5–7%). Compact Class 5 gravel base. No permit for private flatwork. Best season May–September. Call ND One Call (811) before digging.
❄️ ACI 306 Winter Pours (Oct–Apr)
Fargo's winter is extreme — avg Jan low -8°F, extreme lows to -30°F. ACI 306 cold-weather practices are essential: heated mix water, concrete enclosures with heat, insulating blankets for 7+ days. Never pour on frozen subgrade. Winter surcharges of $8–$18/yd are standard October–April. Best season: May through September.
🌊 Spring Flood / High Water Table
The Red River Valley floods regularly in spring. Fargo's water table rises significantly April–June. Avoid placing concrete footings or basement slabs during high water table periods — hydrostatic pressure can crack fresh concrete before it reaches design strength. Schedule major foundations for July–September when the water table is lowest.
Example: 20 ft × 10 ft × 5 in = 83.3 cu ft = 3.09 cu yd → Order 3.4 cu yd (+10%)
Fargo / Cass County Pricing Reference
Fargo is served by several local and regional ready-mix suppliers including Aggregate Industries, Dakota Aggregates, and Border States suppliers crossing from Moorhead, MN. Short-load fees apply for orders under 7–9 yards. Saturday surcharges are common. Winter heated-water surcharges of $8–$18/yd apply October–April. Fiber additive is $4–$6/yd extra.
Mix / PSI
Fargo / Cass County Price / Yd
National Avg
Best For
Air Entrained?
2,500 PSI
$155–$165
$119–$132
Interior protected slabs only
Interior Only
3,000 PSI ← ND Standard
$160–$172
$124–$140
Driveways, patios, garage floors
Req. 5–7%
3,500 PSI
$165–$178
$130–$148
Foundations, 54-in frost footings
Req. 5–7%
4,000 PSI
$172–$185
$136–$155
Basement walls, heavy structural
Req. 5–7%
5,000 PSI
$183–$210
$147–$172
Commercial / post-tensioned
Engineer Req.
Colored / Stamped
$188–$240
$155–$205
Decorative driveways, patios
Req. 5–7%
2,500 PSI — Interior Only
Fargo Price / Yd$155–$165
Best ForInterior protected slabs only
3,000 PSI — ND Standard
Fargo Price / Yd$160–$172
Best ForDriveways, patios, garage floors
3,500 PSI — Structural
Fargo Price / Yd$165–$178
Best ForFoundations, 54-in frost footings
4,000 PSI — Heavy Structural
Fargo Price / Yd$172–$185
Best ForBasement walls, heavy structural
5,000 PSI — Commercial
Fargo Price / Yd$183–$210
Best ForCommercial / post-tensioned
Colored / Stamped
Fargo Price / Yd$188–$240
Best ForDecorative driveways / patios
Fargo Concrete Project Tips
All footings to 54 inches — no exceptions in Fargo — The City of Fargo's local IRC amendment requires every structural footing and foundation pier to reach 54 inches below finished grade. Mandatory City of Fargo Building Inspections footing inspection before any structural concrete is placed. Frost heave at -8°F average January lows will destroy any shallower foundation within 1–2 winters.
Specify air-entrained concrete (5–7%) for all exterior work — required by ND SBC 2023 for all exterior concrete in Fargo. Verify air content with a field pressure meter (ASTM C231) before accepting any truck — reject loads outside 5–7% range. Without air entrainment, Fargo's 100–130 annual freeze-thaw cycles will cause surface spalling within 2–3 winters.
Install 4–6 inch compacted Class 5 gravel base under all slabs — Lake Agassiz clay subgrade shrinks and swells significantly with Fargo's wet springs and dry summers. A well-compacted crushed limestone or Class 5 gravel base provides drainage, breaks capillary moisture rise, and prevents frost lens formation under slabs. Compact to 95% Proctor before forming.
Schedule pours May through September — avoid Oct–Apr — Fargo's winter is one of the most severe in the continental US. If a cold-weather pour is required (below 40°F), follow ACI 306: use heated mix water, enclosures, insulating blankets for 7+ days, and never pour on frozen subgrade. Winter ready-mix surcharges of $8–$18/yd are standard from local suppliers.
Plan for spring Red River flooding — schedule around high water table — The Red River of the North regularly overtops its banks in Fargo April–June. Avoid placing deep footings or basement slabs when the water table is high — hydrostatic pressure can crack fresh concrete and compromise curing. Schedule major foundation work for July–September whenever possible.
No permit needed for flatwork — required for all structures — City of Fargo Building Inspections does not require permits for private driveways, patios, or sidewalks. Permits are required for foundations, basement walls, retaining walls, garages, ADUs, and all additions. All permits submitted through the City of Fargo Permit Portal or by calling (701) 241-1530.
Call ND One Call (811) before any digging — North Dakota law (ND Century Code 49-23) requires calling 811 (ND One Call) at least 2 full business days before any excavation in Fargo. ND One Call coordinates free marking of Xcel Energy / Montana-Dakota Utilities gas/electric, Fargo Water Utilities, and all telecom infrastructure. Violations carry civil penalties up to $1,000 per incident in North Dakota.
Frequently Asked Questions — Fargo Concrete
How much does concrete cost per yard in Fargo, ND?+
Expect $155–$185/yd for 3,000 PSI air-entrained ready-mix in Fargo. Short-load fees apply for orders under 7–9 yards. Winter heated-water surcharges of $8–$18/yd apply October–April. Fiber additive costs $4–$6/yd extra. Saturday delivery adds $75–$150/truck. Local suppliers include Aggregate Industries and Dakota Aggregates. The Fargo-Moorhead metro market benefits from competition between ND and MN-side suppliers.
What is the frost depth in Fargo, North Dakota?+
Fargo's frost depth is 54 inches (4.5 feet) — a local amendment to the IRC, Table R301.2 adopted by the City of Fargo. This is the deepest frost depth requirement of any major US city and reflects Fargo's extreme continental climate, with average January lows of -8°F and extreme lows reaching -30°F or below. Every structural footing and pier must reach 54 inches before the City of Fargo Building Inspections mandatory footing inspection will be passed.
Do I need a permit for concrete in Fargo?+
The City of Fargo Building Inspections Division does NOT require permits for flatwork (driveways, patios, sidewalks on private property). Permits ARE required for all structural concrete — foundations, basement walls, retaining walls, garages, ADUs, and additions. Mandatory 54-inch footing inspection before structural concrete is placed. Submit online via the City of Fargo Permit Portal or call (701) 241-1530.
What are Lake Agassiz clay soils and why do they matter?+
Glacial Lake Agassiz was a massive prehistoric lake that covered the entire Red River Valley. As it drained, it left behind deep deposits of fine, sticky clay soil across Fargo and the surrounding region. These Lake Agassiz clays are highly expansive — they swell when wet (during Fargo's wet springs and Red River flooding) and shrink when dry (in the summer). This cyclical movement cracks foundation walls, heaves slabs, and is the primary cause of foundation movement in the Fargo-Moorhead metro area.
Can I pour concrete in winter in Fargo?+
Yes, but it requires strict ACI 306 cold-weather concrete practices. Fargo's winters are among the harshest in the lower 48 states. Key requirements: concrete must stay above 50°F for 7+ days, heated mix water and aggregates, full enclosures with propane or electric heat for large pours, insulating blankets, wind protection, and absolutely no pouring on frozen subgrade. Winter surcharges of $8–$18/yd are standard. Best season for Fargo concrete: May through September.
What contractor license is required for concrete in North Dakota?+
North Dakota requires all commercial contractors to be licensed with the ND Secretary of State as a contractor. For residential work, ND does not have a statewide home improvement contractor license, but the City of Fargo requires all contractors working under a building permit to be licensed. Always verify your Fargo concrete contractor has a valid City of Fargo contractor license and carries proper liability insurance and workers' compensation coverage before signing any contract.
Issues all Fargo building permits under ND State Building Code 2023. Structural concrete, foundations, basement walls, retaining walls, ADUs, and garages require permits. Mandatory 54-inch footing inspection before structural concrete is placed. Submit online via Fargo Permit Portal or call (701) 241-1530. 200 3rd Street North, Fargo, ND 58102.
North Dakota requires commercial contractors to be licensed with the ND Secretary of State. The City of Fargo additionally requires all permit contractors to hold a valid City of Fargo contractor registration. Always verify your concrete contractor's ND and Fargo licensing before signing any contract. Verify contractors carry liability insurance and workers' compensation coverage.
North Dakota law (ND Century Code 49-23) requires calling 811 (ND One Call) at least 2 full business days before any excavation in Fargo. ND One Call coordinates free marking of Xcel Energy, Montana-Dakota Utilities, Fargo Water Utilities, and telecom lines. Civil penalties up to $1,000 per violation. Request online at ndstatemill.nd.gov or call 811.