Almond & Alfalfa Water Use in California: The Real Numbers

Reviewed August 2026 against USDA NASS, the California Water Impact Network (C-WIN), and the Pacific Institute.

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California almonds need 3.5 to 4.5 acre-feet of water per acre per year on mature orchards, according to the California Almond Board and C-WIN’s 2024 update. Alfalfa needs more: 4.9 to 6 acre-feet per acre per year per University of Nevada, Reno Extension guidelines, and it remains the single largest agricultural water user in the state at roughly 5.2 million acre-feet annually. Alfalfa occupies only about 5% of California’s irrigated acreage, so per-acre demand, not footprint, is what drives that number.

Both crops sit in the same conversation because both are irrigated with a limited, increasingly regulated water supply, and because getting baling moisture wrong wastes the same water you just spent irrigating with. This article covers agricultural water use in California, almond and alfalfa water requirements specifically, and the baling-moisture range that protects hay quality once that water has done its job.

California Almond Water Use: The Numbers

California had 1.383 million acres of bearing almonds in the 2024 crop year, out of 1.52 million total acres planted, per USDA NASS’s May 2024 California Almond Forecast. USDA NASS reissues this forecast four times a year — May, August, October, and December — so a reader who wants the current acreage figure should pull the newest PDF from that same USDA California publications page rather than relying on any single year’s number here.

Mature almond orchards require 3.5 to 4.5 acre-feet of water per acre per year, according to the California Water Impact Network’s 2024 almond water usage update. Applied across the state’s bearing acreage, that per-acre range is what puts almonds at 13% to 17% of California’s agricultural developed water consumption, per the same C-WIN analysis — a large enough share that even small efficiency gains at the orchard level move statewide totals.

Two figures explain why almonds draw scrutiny even though the crop covers less ground than alfalfa: acreage and per-acre demand are both high, and almonds — unlike alfalfa or annual row crops — can’t be fallowed in a dry year without killing a multi-year capital investment. That inflexibility is why almond water use tracks tightly with orchard age and acreage rather than with year-to-year drought decisions the way annual crops do.

For growers who need to document orchard-level water use for financing, insurance, or sustainability certification, satellite-based monitoring paired with crop loan and insurance verification tools creates a defensible, dated record instead of a self-reported estimate.

Agricultural Water Use in California: Where Alfalfa and Almonds Fit

Agriculture is the dominant user of California’s developed water supply, and within agriculture, a small number of high-value, high-acreage, high-water crops account for a disproportionate share of total use. Alfalfa’s 5.2 million acre-feet a year, cited in the Pacific Institute’s California Agricultural Water Use report, makes it the single largest agricultural water user in the state — ahead of almonds, despite covering only about 5% of California’s irrigated acreage.

That 5.2 million acre-foot figure comes from a 2010 baseline in the Pacific Institute’s analysis. It is the most complete statewide alfalfa total publicly available; USDA’s Census of Agriculture is conducted only once every five years (next edition: 2027) and doesn’t cleanly separate alfalfa from other irrigated pasture and forage at the county level in the interim. For a current statewide agricultural water-use breakdown, the California Department of Water Resources publishes its California Water Plan updates on a roughly annual-to-biennial cycle with newer statewide totals — that is the correct place to look for a figure more recent than 2010, rather than assuming the number above has stayed flat.

Why Alfalfa and Almonds Dominate California’s Agricultural Water Use

• Alfalfa: 5% of irrigated acreage but 4.9–6 acre-feet/acre/year in demand, and grown on a scale that adds up to the largest single-crop water draw in the state.
• Almonds: 1.383 million bearing acres (2024) at 3.5–4.5 acre-feet/acre/year, totaling 13–17% of agricultural developed water consumption.
• Both crops compete for the same limited surface and groundwater allocations, which is why deficit irrigation, drip conversion, and satellite-based monitoring show up in both crops’ management playbooks.

Utilizing the Farmonaut API and Developer Documentation, farm management systems can integrate real-time satellite weather and soil moisture data into irrigation scheduling for either crop, reducing the guesswork in a water budget that state regulators are watching closely.

Alfalfa Water Use, Requirements & Watering in California

Alfalfa’s water requirement of 4.9 to 6 acre-feet per acre per year, per University of Nevada, Reno Extension’s alfalfa irrigation guidelines, reflects a deep-rooted, high-evapotranspiration perennial forage crop grown across multiple cuttings a season. Unlike an annual crop irrigated once through a single growth cycle, alfalfa is watered repeatedly between cuttings — typically four to eight times a year depending on region and climate — which is why its seasonal total outstrips even almonds on a per-acre basis.

The practical range that shows up in University Extension irrigation scheduling is 20 to 30 inches per cutting cycle depending on soil type, regional evapotranspiration, and whether the field is under full or deficit irrigation. Growers in California’s Central Valley are managing this crop under both a wetter and colder winter regime than growers in Arizona’s desert alfalfa districts, so a single statewide number always needs adjusting for local evapotranspiration data before it’s used to schedule an actual irrigation event — the calculator further down this page walks through that adjustment.

Alfalfa Water Requirements by Growth Stage

• Establishment (seedling year): Frequent, lighter irrigation to establish root depth without waterlogging shallow roots.
• Full production (years 2+): Deep, less frequent irrigation matching the 4.9–6 acre-feet/acre/year full-season total.
• Between cuttings: Irrigation resumes promptly after each cutting and curing cycle to minimize yield loss from moisture stress.
• Late season / pre-dormancy: Irrigation is typically reduced or cut off to harden the stand for winter, a form of planned deficit irrigation rather than water stress.

Related: Our Large-Scale Farm Management App gives satellite-based real-time crop health and soil-moisture analytics that help growers time irrigation events to actual field conditions rather than a fixed calendar.

Almond vs. Alfalfa Water Use: Comparison Table

Note: 1 acre-foot of water covers one acre to a depth of one foot, equal to roughly 326,000 gallons. Figures above are the most recent published values as of this review; check the source links for updates.

Baling Alfalfa: Moisture Content and Timing

Alfalfa hay should be baled at 15% to 20% moisture. Baling above 20% raises the risk of mold growth, internal heating, and spoilage that can render hay unsafe to feed. Baling below 15% causes leaf shatter — the most nutritious, most digestible part of the plant breaks off and is lost in the field, lowering the value of every remaining bale. Everything upstream — irrigation timing, cutting schedule, drying window — exists to land the crop in that 15–20% band at the moment the baler runs.

Baling Alfalfa Moisture: The Science Behind Quality Hay

• 15–20% moisture (target): Preserves nutritional value, minimizes spoilage risk, and holds leaf-to-stem ratio intact.
• Above 20% moisture: Mold growth, internal heating, and dry-matter loss increase; in extreme cases, wet hay can combust in storage.
• Below 15% moisture: Leaf shatter increases sharply, stripping away the most digestible plant material and reducing feed value per bale.

Tools for Measuring Baling Moisture

• Handheld Moisture Meters: Quick, on-the-spot readings taken directly in the windrow before baling begins.
• On-Baler Sensors: Modern balers increasingly carry integrated moisture sensors that give instant feedback as each bale forms, rather than a single pre-baling spot check.
• Remote Sensing: Satellite and aerial imagery deliver field-wide moisture and growth-stage status, useful for deciding which fields to cut first when a drying window is short.

Discover how carbon footprint tracking can be integrated with soil moisture and crop analytics for alfalfa operations that need to document both water use and post-harvest handling for buyers or certification programs.

Optimal Moisture and Estimated Water Use by Baling Stage

Cutting Alfalfa Water Use: Drip Irrigation and Deficit Strategies

Sub-surface drip irrigation cuts alfalfa water use by 20% to 30% compared to surface (flood) irrigation, according to USDA-referenced research summarized in the USDA Alfalfa Irrigation Facts study. Despite that documented savings range, adoption remains at just 2% of California alfalfa acreage, per California Ag Net’s coverage of the alfalfa sub-surface drip project. That gap between a proven savings range and near-zero adoption is the single biggest lever left unpulled in California alfalfa water management — flood and wheel-line irrigation still dominate the crop’s footprint even though the alternative’s water savings are already measured and published.

Why Adoption Lags the Savings

• Conversion cost: Retrofitting flood or wheel-line fields to sub-surface drip requires significant upfront capital that a lower-value forage crop takes longer to recover than a permanent crop like almonds.
• Field life assumptions: Alfalfa stands are typically replanted every 3 to 6 years, which shortens the payback window for a drip system compared to a multi-decade orchard investment.
• Water rights structure: In districts where water is allocated by historical use rather than metered consumption, the financial incentive to cut use is weaker than the agronomic case for doing so.

Other Water-Saving Approaches Alongside Drip Conversion

• Soil Moisture Sensors: Trigger irrigation only when root-zone moisture drops below a set threshold, rather than on a fixed calendar.
• Deficit Irrigation: Deliberately reducing water during non-critical growth stages — particularly late season before dormancy — to cut total use with a smaller yield trade-off than cutting water during peak growth.
• Satellite-Based Scheduling: Combining weather forecasts with field-level crop-water-stress data to time each irrigation event to actual evapotranspiration rather than a generic schedule.

Tip: Farmonaut’s Crop Plantation & Forest Advisory Platform gives California alfalfa and almond growers real-time farm health, irrigation risk alerts, and harvest-timing recommendations built on the same satellite data referenced above.

Alfalfa Field Water Need Calculator

Enter your field’s acreage, number of cuttings, and irrigation method to estimate seasonal water need using the University Extension range of 4.9–6 acre-feet/acre/year and the USDA-documented 20–30% drip savings range cited above.

Assumptions: uses the University of Nevada, Reno Extension per-acre range of 4.9–6 acre-feet/acre/year and the USDA-referenced 20–30% drip savings range (midpoint 25% applied). Excludes rainfall offset, soil type, regional evapotranspiration differences, and conveyance losses — treat the output as a planning starting point, not an irrigation schedule.

Monitoring Water Use and Moisture with Satellite Tools

As a satellite technology company, Farmonaut gives California alfalfa and almond growers, agronomists, and agri-businesses a way to turn the figures above into field-specific decisions rather than statewide averages:

• Multispectral Crop Monitoring: Field-by-field moisture trends and stress detection through browser, Android, and iOS apps.
• JEEVN AI Advisory: Weather, irrigation, and harvest-timing suggestions built from real-time field data.
• Traceability Platforms: Track bale origins, harvest handling, and transport chains for buyers requiring documented sustainability practices.
• APIs and Data Integration: Connect imagery and advisory data directly into an existing farm management system, from a single field to a regional operation.

Our blockchain-powered Product Traceability Solution documents bale-level records for buyers and certification programs that increasingly require verified water-use and handling data, not self-reported claims.

For operations managing irrigation and harvest logistics across many fields, our Fleet Management System helps keep cutting, raking, and baling schedules as tightly timed as the irrigation events feeding them.

Crop loan and insurance verification through Farmonaut's satellite-based services helps California growers document water use and crop development, supporting financing applications and lower premiums tied to demonstrated efficient practices.

Where This Fits an Almond or Alfalfa Water Budget

• Reduce Risk of Losses: Identify fields at risk of drought stress or spoilage-prone moisture levels before harvest, not after.
• Optimize Input Costs: Match irrigation applications to measured crop need instead of a fixed calendar, directly addressing the drip-adoption gap described above.
• Support Compliance Documentation: Automated, dated records ease reporting under state and local water-allocation rules.

Want direct access to satellite-driven farm analytics? Use the fully-featured platform from a browser or mobile device:

Frequently Asked Questions

Get Started with Farmonaut: Subscription Options & Support

Access advanced monitoring, advisory, and compliance solutions for almond and alfalfa water management. Explore Farmonaut's plans and features, built for operations from family-owned fields to multi-thousand-acre almond and alfalfa operations:

The Bottom Line on California Almond and Alfalfa Water Use

Almonds use 3.5–4.5 acre-feet per acre per year across 1.383 million bearing acres; alfalfa uses more per acre — 4.9–6 acre-feet — across a much smaller footprint, making it the state's largest single-crop water user at roughly 5.2 million acre-feet annually. The durable lever for either crop is efficiency: sub-surface drip alone documents 20–30% savings on alfalfa yet sits at just 2% adoption, meaning most of the achievable reduction hasn't been captured yet. On the hay side, the 15–20% baling moisture window is the fixed target that protects the water and labor already invested in the crop, regardless of what the water-supply picture looks like in any given season.

For growers tracking either metric on their own fields, satellite-based monitoring turns state and university averages into field-specific numbers — try the web or mobile app below.