What are the ideal weather conditions for harvesting?
Written by
Liu Xiaohui
Reviewed by
Prof. Samuel Fitzgerald, Ph.D.Weather conditions are a deal maker or breaker for onion harvest. The ideal scenario would be dry mornings after two whole days of rain-free weather. I typically harvest onions when the temperature is between 60-75°F (16-24°C), thus preventing sunscald on exposed bulbs and allowing the field to dry before curing.
Rain-Free Period
- Require 48+ hours without rainfall
- Soil surface must feel dry to touch
- Morning dew should evaporate quickly
Temperature Range
- Ideal: 60-75°F (16-24°C)
- Below 55°F slows drying process
- Above 80°F risks sun damage to bulbs
Wind Conditions
- Gentle breeze (5-10 mph) aids drying
- Strong winds damage tops and skins
- Calm air encourages moisture retention
Soil moisture levels determine the safety of a harvest. Take a handful of garden soil and squeeze it. It must crumble away without sticking. I lost bulbs to rot when I harvested damp soil. Moisture trapped between layers can lead to bacterial soft rot within a few days.
Anticipate unexpected weather shifts with preparation. Row covers will be ready for unexpected rain. Employ shade cloth if temperatures escalate unexpectedly. During harvest week, I check the forecast every hour, adjusting harvest plans and plot preparations based on hourly radar updates.
Perform post-harvest protocols for imperfect conditions if you harvest in borderline humidity, put bulbs under air movement immediately. Space in single layers and turn every 12 hours. These practices saved the harvest when humidity unexpectedly increased.
Cultivating an understanding of weather-responsive harvesting is key to growing onions successfully. Following the atmospheric details will reward you with crunchy, long-lasting bulbs. The flavor of homegrown onions reaches its fullest potential when you work in harmony with nature at the perfect timing.
Read the full article: When to Harvest Onions: Complete Guide
