ByeGly

Updated November 10, 2026

Spray calendar

Data file: spray-calendar.csv

When glyphosate is typically applied to some common field crops, by region and month, with a source for every row.

All months on this page are typical, not exact. Most sources give a crop stage (for example, grain moisture under 30%), not a date. We matched that stage to a government or extension calendar for the region, and each row says how its months were set.

This is a general calendar, not a record of what happened on any farm. A row shows when an application can typically happen in that region. It does not mean every field, or any product on our list, was treated.

Columns

Column Meaning
crop The crop the application relates to.
country, region Country plus state, province or growing region the source covers.
typical_window_months / typical_months Typical application window by month. These are typical months, not exact dates. typical_months is the same window as a list, for the timeline.
application_type burndown (before planting or after harvest, to clear existing weeds), in-crop (sprayed over a growing glyphosate-tolerant crop), or pre-harvest (shortly before harvest).
purpose_as_stated What the source says the application is for. Canadian sources say pre-harvest glyphosate is registered for weed control and is not to be used as a desiccant; U.S. extension sources describe it as a harvest aid or dry-down. We keep each source's own framing instead of calling every pre-harvest row "desiccation".
timing_as_stated The crop stage or timing rule the source gives.
notes Buyer or label limits the source mentions.
source_url Source for the application type and timing. More than one URL is separated by a space.
month_source_url Source for the months.
how_months_were_set In plain words, how we set the typical months for the row. Show this to readers next to the months.
month_basis_detail The longer explanation, with the dates and figures taken from the month source. Most extension and regulatory sources give a crop stage, not a month, so most rows pair the stage source with a government harvest or planting calendar. One row (Illinois) states months directly.

Table

Crop Region Typical months Type Timing (as stated by the source) How the months were set Type and timing source Month source
oats Canada: Saskatchewan Aug-Sep pre-harvest When grain moisture is under 30% in the least mature part of the field (hard dough); harvest 7-14 days after application Typical timing, based on crop stage plus the Saskatchewan provincial harvest calendar (all crops, five-year average). 1 2 1 2 3
wheat Canada: Saskatchewan Aug-Sep pre-harvest 30% or less grain moisture; typically 7-14 days before harvest Typical timing, based on crop stage plus the Saskatchewan provincial harvest calendar (all crops, five-year average). 1 2 1 2 3
barley (feed/food; not malting) Canada: Saskatchewan Aug-Sep pre-harvest Under 30% grain moisture (hard dough); 7-14 days before harvest Typical timing, based on crop stage plus the Saskatchewan provincial harvest calendar (all crops, five-year average). 1 2 1 2 3
lentils Canada: Saskatchewan Aug-Sep pre-harvest Under 30% seed moisture in the least mature part of the field; 7-14 days before harvest Typical timing, based on crop stage plus the Saskatchewan provincial harvest calendar (all crops, five-year average). 1 2 3 1 2 3
peas (field peas) Canada: Saskatchewan Aug-Sep pre-harvest Under 30% seed moisture in the least mature part of the field; 7-14 days before harvest Typical timing, based on crop stage plus the Saskatchewan provincial harvest calendar (all crops, five-year average). 1 2 1 2 3
canola Canada: Saskatchewan Aug-Sep pre-harvest At 50-60% seed colour change in the least mature areas (grain moisture under 30%); harvest 7-14 days after application Typical timing, based on crop stage plus the Saskatchewan provincial harvest calendar (all crops, five-year average). 1 2 1 2 3
chickpeas Canada: Saskatchewan Aug-Sep pre-harvest Under 30% seed moisture in the least mature part of the field Typical timing, based on crop stage plus the Saskatchewan provincial harvest calendar (all crops, five-year average). 1 2 1 2 3
dry beans Canada: Manitoba Aug-Sep pre-harvest Crop ready when at least 80% of the field is at full maturity (R9) and seed is under 30% moisture in the least mature parts Typical timing, based on crop stage plus the months given in the same Manitoba Pulse & Soybean Growers guide. 1 2 1
wheat (spring) United States: Minnesota Jul-Sep pre-harvest At or just after physiological maturity / hard dough; seven-day pre-harvest interval Typical timing, based on crop stage plus the USDA harvest calendar for Minnesota. 1 2 1
lentils United States: Washington and Idaho (Palouse) Jul-Aug pre-harvest When at least 80% of pods are yellow to brown and under 30% of leaves are green; seven-day pre-harvest interval Typical timing, based on crop stage plus the harvest months in the U.S. pulse crop pest management plan (2003). 1 1
peas (dry peas) United States: Washington and Idaho (Palouse) Jul-Aug pre-harvest When at least 80% of pods are yellow to brown and under 30% of leaves are green; seven-day pre-harvest interval Typical timing, based on crop stage plus the harvest months in the U.S. pulse crop pest management plan (2003). 1 1
corn United States: Indiana Apr-Jun burndown Almost any time before planting in the spring; allow 7-10 days for glyphosate to work Typical timing, based on "before planting" plus the USDA planting calendar for Indiana. 1 2 1
soybeans United States: Indiana Apr-Jun burndown Almost any time before planting in the spring; allow 7-10 days for glyphosate to work Typical timing, based on "before planting" plus the USDA planting calendar for Indiana. 1 2 1
soybeans (fields planned for no-till soybean) United States: Illinois Oct-Nov burndown Mid-October to late November Typical timing, as stated in the source. 1 1

How the typical months were set

  • Saskatchewan rows. Sources set pre-harvest timing by grain moisture (under 30%) and say it falls 7 to 14 days before harvest (Health Canada, 1992; Keep it Clean). Government of Saskatchewan crop reports give the five-year average harvest progress for the province: 15% by August 17, 39% by August 31 and 91% by September 28 (Aug 20, 2026 report; Sep 3, 2026 report; Oct 1, 2026 report). These are all-crop figures, so the August-September window is province-wide, not crop by crop.
  • U.S. Minnesota and Indiana rows. Months come from the usual planting and harvesting dates in USDA's Agricultural Handbook 628 (2010) (USDA NASS).
  • Palouse rows. Months come from the Pest Management Strategic Plan for Pulse Crops (2003), which says pulse harvest typically takes place in August and dry pea harvest begins in late July (USDA IPM Centers).
  • Manitoba dry beans. Months come from the same Manitoba Pulse & Soybean Growers guide that gives the crop stage (guide).

What is not in this table yet

  • In-crop rows. Sources we opened describe in-crop glyphosate use on glyphosate-tolerant corn, soybeans and canola by crop stage, but none we opened tied those stages to months. We left in-crop rows out rather than estimate.
  • U.S. oats. University of Minnesota Extension wrote in 2019 that, among the small grains it discussed, a pre-harvest glyphosate application "is only labeled in wheat," and that oats are still commonly swathed (UMN Extension, 2019). We did not find a U.S. source that supports an oat pre-harvest row with months.
  • European Union. The European Commission says pre-harvest uses "for desiccation to control the time point of harvest or to optimise threshing are not permitted in the EU" (European Commission). We have no EU rows.

Sources