How To Rake Hay: The Complete Technical Guide To Efficient Forage Windrowing

Raking hay is a critical mechanical operation designed to lift cut forage off the ground, invert it to accelerate moisture evaporation, and consolidate it into uniform windrows for baling. Mastering this process requires precise timing relative to relative humidity, strict ground-speed management to minimize leaf shatter, and proper mechanical calibration to prevent soil contamination.

Pre-Operation and Equipment Checklist

Successful forage harvesting begins long before the tractor hits the field. Raking bridges the gap between mowing and baling, acting as the primary tool for moisture management. Poor execution results in sun-bleached nutrients, excessive leaf loss, high ash content from dirt pickup, or wet centers that spoil in the bale.

• Essential Gear and Tools: A properly ballasted utility tractor (typically 45 to 90 horsepower depending on implement width), a reliable hay rake (rotary, wheel, or parallel bar), a functional PTO shaft or hydraulic hookups, a digital moisture tester, and standard field maintenance tools (grease gun, spare tines, pin retainers).
• Prerequisite Knowledge and Standards: Familiarity with target moisture windows (alfalfa should be raked between 40% and 50% moisture to prevent leaf loss; grass hays can tolerate slightly lower ranges), understanding ground contour adaptation, and calculating optimal tractor gear ratios.
• Budget and Duration Benchmarks: Operating speeds generally range from 4 to 8 miles per hour. Field capacity varies by implement width, averaging 6 to 10 acres per hour. Maintenance checks require 15 to 30 minutes of pre-trip inspection.

Step-by-Step Windrowing Execution

Step 1: Evaluate Crop Moisture and Weather Conditions

Examine the forage standing in the swath or stubble using a hand-squeeze test or a calibrated forage moisture meter. Rake when the upper canopy reads between 40% and 50% moisture content. Raking too early extends field-curing time unnecessarily, while raking too late (below 35% moisture in legumes) causes severe leaf shatter, as brittle leaves break away from the stem and fall to the ground.

• Verify that the morning dew has burned off and relative humidity has dropped below 60%.
• Check the 48-hour local forecast for unexpected precipitation events.

Pro-Tip: Alfalfa leaves hold the highest concentration of crude protein and total digestible nutrients. Always rake in the early morning or late evening when ambient humidity is slightly higher if handling brittle legume crops to preserve leaf retention.

Step 2: Calibrate and Inspect the Rake

Position the tractor on flat ground and perform a complete mechanical walkaround. Inspect all rake tines for wear, bending, or missing hardware. Adjust the working height of the rake using the tractor's three-point hitch or implement gauge wheels.

• Ensure tines hover roughly one-quarter to one-half inch above the soil surface.
• Lowering tines into direct contact with the dirt introduces soil, stones, and debris into the windrow, elevating the ash content and risking hardware damage to downstream balers and livestock digestive tracts.

Warning: Never adjust hydraulic cylinders or clear wrapped forage from active reel mechanisms while the tractor engine is running or the PTO is engaged. Always disengage power, shut down the engine, and remove the key.

Step 3: Determine Pattern and Direction of Travel

Plan your field entries and travel direction based on the path previously taken by the mower-conditioner. Match the direction of the rake to the lay of the cut swaths.

• Travel in the same direction that the forage was mowed to ensure smooth feeding into the rake mechanism without bunching or rolling over tangled crop mats.
• Combine two or more mower swaths into a single windrow if the forage yield is light, matching the pickup capacity of your subsequent baler model. Avoid building windrows that are wider than the baler pickup head.

Step 4: Execute Field Operations and Monitor Ground Speed

Engage the tractor transmission and bring the engine up to the manufacturer's recommended PTO operating speed (typically 540 or 1000 RPM) or maintain steady hydraulic flow for hydraulic-driven rotary units. Maintain a consistent ground speed between 4 and 6 miles per hour.

• Avoid sudden acceleration or sharp turns that scatter the windrow or wrap forage around the hubs.
• Continuously monitor the windrow profile in the rearview mirror, checking for uniform density, clean crop retrieval, and an absence of roping or twisting.

Rake Types and Performance Characteristics

Common Site Failures and Field Fixes

• Root Cause: Excessive ash content and dirt contamination found in baled hay.
  
  
  • Actionable Fix: Raise the implement gauge wheels or three-point hitch arms to ensure tines clear the soil surface. Inspect fields for mole hills or uneven terrain before operating.
• Root Cause: Severe leaf loss and shattering in dry alfalfa fields.
  
  
  • Actionable Fix: Stop daytime operations immediately. Resume raking exclusively in the early morning hours when natural dew adds pliability back to the leaves and stems.
• Root Cause: Uneven, bunching windrows that clog the baler pickup.
  
  
  • Actionable Fix: Reduce ground speed, match the tractor gear ratio to the density of the swath, and ensure you are not attempting to combine too many swaths into a single pass for the implement's capacity.
• Root Cause: Premature failure of tines and mounting hardware.
  
  
  • Actionable Fix: Check for loose bolts, inspect rubber dampeners on wheel rakes, and verify that the rake is not contacting hidden obstacles like rocks or fence lines along field borders.

Frequently Asked Questions

What is the best moisture level for raking hay?

The ideal moisture level for raking depends on the crop type, but generally falls between 40% and 50%. Raking alfalfa at this range minimizes leaf shatter, while grass hays can often be managed closer to 35% moisture before raking.

Should I rake hay before or after a rain?

You should always complete baling before a rain event if possible. If rain catches your cut hay in the field, wait until the top of the swath dries, then rake it once to invert the windrow and expose wet material underneath to drying air and sunlight.

How fast should you pull a hay rake?

Most hay rakes operate most efficiently between 4 and 8 miles per hour. Operating too fast causes the crop to scatter, while operating too slowly reduces daily field capacity and increases labor costs.

Why does my hay rake leave windrows with lumps and gaps?

Lumpy windrows usually occur due to inconsistent tractor ground speed, uneven crop density from the original mower pass, or worn-out, bent tines that fail to sweep the crop cleanly. Maintain steady RPMs and replace damaged tines promptly.

Maximize Your Forage Quality Today

Optimizing your hay raking protocol directly protects nutritional value, boosts palatability, and ensures maximum profitability per acre. Fine-tune your equipment settings, monitor weather windows closely, and safeguard your harvest from the ground up.