Bison Top Sirloin Steak - 8 oz

Northstar's Bison Top Sirloin is the everyday steak for people who won't compromise. Trimmed clean, cut to a full inch thick, and wet-aged 21 days for tenderness you can actually taste — this is whole-muscle bison with nothing added, nothing masked.

Raised on family-run land across Northwest Wisconsin and East Central Minnesota on Northern Plains pasture, these bison roam free from birth to harvest. They are 100% Grass-Fed and Finished — no grain at any stage of life. The herd is raised regeneratively, never confined, and field harvested using a zero-stress method that respects both the animal and the land. No antibiotics. No hormones. No additives of any kind. Soy-free, corn-free, and Non-GMO.

Pick up a top sirloin at most grocery stores and you're getting grain-finished beef from a feedlot operation — managed for volume, trimmed for appearance, and often carrying flavor enhancers or colorings to compensate for what the raising method stripped out. Northstar's is a different animal entirely: bison that spent its entire life on pasture, finished on grass, and harvested without the stress that degrades meat quality. Nothing between you and what's actually in the package.

Bison is naturally leaner than conventionally raised beef, with higher naturally occurring CLA (conjugated linoleic acid) and omega-3 fatty acids — a gap that widens further when the animal is grass-fed and finished rather than grain-finished. No flavor enhancers or colorings masking what's in the cut.

Sear hard on a cast-iron skillet or grill over high heat. Bison cooks faster than beef — pull it a touch earlier than you think. Arrives cut to 1" thick right out of the pack.

Customers consistently describe the Top Sirloin as tender, flavorful, and genuinely good value for a premium bison steak. The lean quality and clean flavor are the most common callouts — along with fast, well-packaged delivery that arrives in perfect condition.

• "Really tender and so flavorful. Love them grilled with fresh mushrooms, bright green salad and a crusty bread. When we're in the mood to indulge, Northstar Bison is our go to choice!" — PJ, verified buyer
• "The bison top sirloin is a great alternative to the bison NY Strip... Has good flavor and minimal fat present. Quality is up to par, and a better priced option if you are looking for a good bison steak at a lower cost." — Jamie S., verified buyer
• "My family LOVES our bison from Northstar!! Best meat we have ever eaten." — Brandi L., verified buyer

Fits keto, paleo, carnivore, and gluten-free lifestyles. Packaged frozen. Keeps in the freezer up to 24 months. Thaw in the refrigerator 12–24 hours before cooking; use within 5–7 days of thawing.

Customers who switch to Northstar's bison sirloin rarely go back — the flavor, tenderness, and cooking experience stand out consistently across hundreds of reviews.

• "Amazing cuts and taste was amazing. It was a hit. I'm not a fan of grass-fed beef. But this tasted like nothing else. Definitely buying more." — Paul J., Verified Buyer
• "Really tender and so flavorful. Love them grilled with fresh mushrooms, bright green salad and a crusty bread. When we're in the mood to indulge, Northstar Bison is our go-to choice!" — PJ, Verified Buyer
• "My family LOVES our bison from Northstar!! Best meat we have ever eaten." — Brandi L., Verified Buyer

Hand delivered to your door by local drivers.

Ingredients: 100% Grass Fed and Finished Bison.

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Common Questions

How does grass-fed and finished bison compare nutritionally to conventional grain-finished beef?
Grass-fed and finished bison is meaningfully leaner than grain-finished beef, and the fat it does carry has a different nutritional profile. Research published in Nutrition Journal found that grass-fed ruminants deliver 2–3 times more conjugated linoleic acid (CLA) than grain-finished animals, and a more favorable omega-6 to omega-3 ratio — often approaching 3:1 or lower, compared to 7:1 or higher in grain-finished beef. A 3.5 oz serving of bison typically contains approximately 143–171 calories depending on preparation and 2–6g of total fat, versus roughly 250 calories and 15g of fat for a comparable cut of conventional grain-finished beef. Bison also tends to be higher in iron, zinc, and B12 per calorie than conventionally raised beef. The grass-finishing step matters specifically because animals switched to grain in their final months rapidly accumulate saturated fat and lose the omega-3 advantage — meaning 'grass-fed' without 'grass-finished' can be nutritionally closer to feedlot beef than the label implies.

What does CLA actually do, and why is the grass-fed source different from supplements?
Conjugated linoleic acid (CLA) is a naturally occurring fatty acid found primarily in the meat and dairy of ruminants. The predominant naturally occurring isomer is cis-9, trans-11 CLA (also called rumenic acid), which is the form found in grass-fed beef and bison. Research in peer-reviewed nutrition journals has associated this naturally occurring isomer with potential benefits including reduced body fat accumulation and modest anti-inflammatory effects in some studies, though results in human trials are mixed and context-dependent. Most CLA supplements use the trans-10, cis-12 isomer, a synthetically produced form that has shown more mixed results and some adverse effects on lipid profiles and insulin metabolism in studies. Grass-fed bison delivers the naturally occurring isomer in a whole-food matrix alongside other nutrients, which appears to behave differently than isolated supplement doses. Finishing on grain sharply reduces CLA content in the animal's fat, which is why 'grass-finished' is the meaningful qualifier rather than just 'grass-fed.'

Does this steak fit keto, paleo, or carnivore macros, and what are the actual numbers?
Yes — bison top sirloin is compatible with keto, paleo, and carnivore protocols. Northstar does not publish a nutrition label for this specific cut, but bison top sirloin is consistently reported across USDA database entries at approximately 143–171 calories per 3.5 oz (100g) serving depending on preparation, with 25–28g of protein and 2–6g of total fat. There are zero carbohydrates. That fat-to-protein ratio is lower than most keto targets, so carnivore and paleo practitioners will use it freely as-is, while strict keto eaters sometimes add fat at cooking (tallow, butter) to hit their ratio targets. The cut contains no additives, no fillers, no soy, no corn, and no grain at any stage of production, which satisfies the ingredient standards of all three protocols. For carnivore specifically, the zero-additive, single-ingredient profile is a practical advantage over many conventionally produced steaks that carry undisclosed flavor enhancers or sodium solutions.

Can I substitute this bison sirloin directly for beef in recipes, and what do I need to adjust?
Bison top sirloin substitutes cleanly into any recipe that calls for a beef sirloin steak — grilled steak, pan-seared steak with compound butter, steak salad, fajitas, steak tacos, or sliced over roasted vegetables. The key adjustment is cook time and temperature: because bison is significantly leaner than beef, it has less intramuscular fat to act as insulation and baste the meat from within, so it reaches doneness faster and is less forgiving of overcooking. Pull bison 5–10°F earlier than you would beef — for medium-rare, aim for an internal temp of 130–135°F and rest 5 minutes before cutting. High heat, short cook time, and a hot cast-iron pan or grill work best. Avoid cooking past medium (145°F internal), as the lean muscle fibers tighten quickly and the steak becomes noticeably drier. Do not cook from frozen; thaw fully in the refrigerator 12–24 hours first. Adding a small amount of cooking fat — butter, tallow, or avocado oil — to the pan compensates for the lower internal fat content and helps achieve a proper crust.

What USDA labeling rules apply to bison, and how can I verify what Northstar claims?
The USDA's Agricultural Marketing Service formerly maintained a voluntary Grass-Fed Marketing Claim Standard, but that standard was withdrawn in January 2016. Today, producers who wish to use 'grass-fed' on product labels must submit their proposed label and supporting documentation to USDA's Food Safety and Inspection Service (FSIS) for review. 'No antibiotics' and 'No hormones' claims require supporting documentation submitted to FSIS, and producers who make these claims are subject to audit. Northstar's claims — 100% Grass-Fed and Finished, no antibiotics, no hormones, no additives, soy-free, corn-free, Non-GMO — are specific enough that any misrepresentation would constitute a USDA labeling violation, which carries legal consequences. As a third-party verification step, you can look for producer transparency: Northstar names the specific geography of their herd (Northwest Wisconsin, East Central Minnesota, and Northern Plains pasture) and describes the raising method in operational detail (field harvested, zero-stress method, never confined), which is harder to fabricate than generic label language. Contacting the producer directly to ask for documentation on any specific claim is always a reasonable step with a premium product.

What is wet-aging, and why does 21 days of it matter for a lean cut like bison sirloin?
Wet-aging means the cut is vacuum-sealed and held at refrigeration temperature for a defined period — in this case 21 days — before freezing or sale. During that window, naturally occurring enzymes (primarily calpains and cathepsins) break down the structural proteins in muscle fiber, which reduces toughness without changing the outward appearance or losing moisture. The process matters more for lean cuts than for well-marbled ones because intramuscular fat softens texture mechanically in fatty beef — but in a lean cut like bison sirloin, enzymatic aging does most of that work. Research on beef aging shows that the majority of tenderness gain from wet-aging occurs in the first 14–21 days, with diminishing returns beyond that window. At 21 days, this cut reaches a practical tenderness ceiling without the flavor loss that can accompany over-aging. For a product that is also 100% grass-fed and finished — where the leaner muscle composition would otherwise produce a firmer bite than grain-finished beef — the 21-day age period is a meaningful process step, not just a number on the label.

What does 'field harvested using a zero-stress method' actually mean for meat quality?
Field harvesting means the animal is harvested on the pasture where it lives rather than being transported to a processing facility. Conventional harvest requires loading animals onto trailers, transporting them to a slaughter facility, and holding them in unfamiliar pens — a process that triggers cortisol and adrenaline release that can last hours or days. Elevated cortisol at harvest has documented effects on meat quality: it accelerates glycogen depletion in muscle tissue, which raises the final pH of the meat above the optimal range of 5.4–5.7. Meat harvested at elevated pH (a condition called dark, firm, and dry — or DFD) is darker in color, has a shorter shelf life, and is tougher in texture. Field harvest eliminates transportation stress entirely, allowing glycogen reserves to remain intact and pH to drop normally post-harvest, which produces more consistent color, texture, and flavor. It also aligns with Northstar's regenerative and animal welfare commitments, since the animal's last experience is on the land where it spent its entire life.