The winter gap, November through March, is 151 days with no fresh crops, so a community of 100 eating a 2,800 kcal average needs about 42.3 million kcal in store before the first frost, close to the caloric guide’s 42 million. As weight, that is about 25,500 lb of corn or 120,000 lb of potatoes if either supplied it all, and any shortfall must be met by a lower ration, which the arithmetic below lets you set before winter.
Part of Caloric Budget for a Community
Winter calorie gap planning is the calculation and storage of enough preserved food to feed a community through the months when nothing is growing.
The Gap Is Fixed By The Calendar, Not The Harvest
The caloric guide calls November through March the critical vulnerability of a temperate community: no fresh crops grow unless it uses four-season techniques, and calories come from stored roots, dried grain and beans, preserved foods, dairy and reduced egg laying. It says to store at least 5 months of calories, roughly 42 million for 100 people.
Worked Example: The Size Of The Store
- Days from 1 November to 31 March: 30 + 31 + 31 + 28 + 31 = 151 (in a year of 365 days).
- Calories: 280,000 kcal per day × 151 = 42,280,000 kcal. The guide’s 42 million uses 5 months of 150 days (280,000 × 150 = 42,000,000); the difference is under 1%.
- If corn supplied all of it at 1,650 kcal per lb: 42,000,000 ÷ 1,650 = 25,455 lb, about 25,500 lb or 12.7 short tons.
- If potatoes supplied all of it at 350 kcal per lb: 42,000,000 ÷ 350 = 120,000 lb, 60 short tons.
- In practice a mix is stored. The guide recommends that no single crop supply more than 30% of total calories, so in a real plan these totals are shared among grain, roots, legumes and preserved foods.
- If the store falls short, the ration that makes it last is stored calories ÷ (151 × population). For example, 38 million kcal stored against the 42.3 million needed gives 38 ÷ 42.28 = 90% of the average, or 0.90 × 2,800 = 2,517 kcal per person per day. Decide who is protected first (Children, Pregnant, and Elderly Adjustments).
The 2,800 average is for the whole year. Winter work is lighter than the planting and harvest weeks (Seasonal Labor Calorie Spikes), but cold raises the body’s need, so do not reduce the winter figure without weighing people.
What Fills The Gap
- Stored roots, potatoes, turnips, carrots, beets, in cellars (Root Cellars)
- Dried grains and beans, properly stored (Grain Storage)
- Preserved food, canned, smoked, cured and fermented (Canning & Pressure Preservation, Large-Scale Smoking & Curing)
- Dairy and eggs, which are small calorie sources at community scale (Dairy and Egg Calorie Efficiency)
- Four-season growing, which can shorten the gap (Four-Season Growing)
- Sweeteners, which are a very small share (Caloric and Nutritional Role)
Method: Plan And Verify The Store
Step 1: Compute the store from the calendar and the ration: days in your gap × people × kcal. Step 2: Divide among crops by calorie share, then convert each to pounds. Step 3: Add a spoilage margin from your own storage loss record (FIFO Rotation). Step 4: In October, measure what is actually in store and recompute the ration in step 6 above. Step 5: Reserve the emergency grain separately (Buffer for Crop Failure and Pests).
Common Mistakes
- Planning on the harvest, not the ration. The store is what is left after the autumn, not what was grown.
- Starting winter on a full ration with no check. A shortfall found in January is hard to fix; found in October it is a ration.
- Forgetting that the gap may run past March. Early spring is also lean.
What’s Next
- Learn next: Caloric and Nutritional Role — a small but useful part of the winter ration
- Combine with: Seasonal Production Calendar — the year the gap sits in