· Analytic
Z4381 Corn Silking Pace (State-Weighted Belt)
How fast the US Corn Belt is reaching the silking phenology stage versus the five-year same-week norm, weighted by state production share. Silking is the most weather-vulnerable moment in the corn growing cycle; this signal measures whether the vulnerability window is arriving ahead-of-schedule across the production-dominant states, where it matters.
At a glance
POST-SEASON SIGNATURE
Current composite
+0.5315
On the plus-or-minus one scale; belt silking well ahead of 5y norm
SEASONAL STATE
POST-SEASON SIGNATURE
Silking is biologically complete for the 2026 season
Signal state
Extreme POS
49 consecutive days in state (episode start 2026-08-24)
All-time percentile
89.0th
Upper-decile of 26 years Historical sample is dominated by in-season firings; off-season…
extreme-pos corn fwd 60d
+4.67%
1,107 days (12.3% of sample), HAC t +4.53 significant at 1% Historical sample is…
moderate-pos corn fwd 60d
-1.72%
1,545 days (17.2% of sample), HAC t -2.62 significant at 1% (sign-flipped vs pre-patch)…
Current state corn fwd 60d
+4.67%
extreme-pos mean, edge +5.16pp vs -0.48% baseline Historical sample is dominated by…
As of Oct 30, 2026. Updated nightly. · NEXT WINDOW JUNE 2027
OBJECTIVE
The silking phenology stage is the single most weather-vulnerable moment in the US corn growing cycle. During silking the corn ear’s silks emerge from the husk and must be pollinated within approximately a one-week window by pollen from the tassel. Heat stress above 95 degrees Fahrenheit and water stress during silking directly reduces kernel count on the ear, with the yield impact non-recoverable later in the season. The USDA National Agricultural Statistics Service tracks silking progress weekly as part of its Monday-afternoon Crop Progress reports from July through late August, broken down by state. This signal takes the state-level silking data for ten belt states (Iowa 0.19, Illinois 0.15, Nebraska 0.12, Minnesota 0.11, Indiana 0.08, South Dakota 0.07, Ohio 0.05, Missouri 0.05, Wisconsin 0.04, Kansas 0.04 , totaling approximately 90 percent of US corn production), computes each state’s current-week minus five-year-same-week mean, weighted-aggregates by production share, forward-fills daily, z-scores on a 504-trading-day rolling window, and tanh-bounds to the plus-or-minus one scale. Here is the empirical pattern across 26 years of state-weighted history. The ahead-pace side of the state ladder is BIMODAL, mirroring the Corn Development Pace (State-Weighted Belt) Corn Development Pace pattern. extreme-pos state (val above plus 0.5, belt silking well ahead of 5y norm) delivers mean corn fwd 60d of plus 4.67 percent (HAC Newey-West t plus 4.53, significant at the 1 percent level, 1,107 state-days, edge plus 5.16 pp above the minus 0.48 percent baseline) , the author-thesis-aligned bullish pattern. moderate-pos state (val between plus 0.2 and plus 0.5, belt silking modestly ahead) delivers minus 1.72 percent (HAC t minus 2.62, significant at the 1 percent level, 1,545 state-days). The empirical signature is: belt EXTREMELY ahead of pace creates pollination-vulnerability tail risk that drives bullish forward returns; belt MODESTLY ahead has already-priced-in bear reaction. The signal reads +0.527 as of Oct 30, 2026, in extreme-pos territory for 49 consecutive trading days, at the 89.0 percentile of 26 years. The signal contributes 10 percent weight to Corn Cycle DNA with polarity sign plus one; the current contribution to Corn Cycle DNA is plus 0.0531. Read on for the three signature historical cases, the five-state verdict evidence, and the current reading in context. Important seasonality note: silking happens biologically in July and early August across the US Corn Belt. Readings during the pollination window (June through early August) reflect active heat-exposure risk; readings after silking is complete (mid-August onward) carry structural information from how the season resolved but little forward conviction on the pollination-vulnerability mechanism. The current November reading is in post-season signature mode.
LIVE CHART
Twenty-six years of US Corn Belt state-weighted silking pace against the five-year same-week norm.
The signal has been in extreme-pos for 49 consecutive trading days through Oct 30, 2026, with composite at +0.527 (89th percentile). Context for today’s reading: 2026 US Corn Belt silking ran BEHIND the 5y norm through the June-July pollination window (composite -1.000 mid-July). The signal flipped to Ahead-Of-5y-Norm on 2026-08-24 as late-silking states resolved; the current reading is a post-season signature of how the 2026 season closed, not an in-season extreme-pos firing. Signature in-season extreme-pos firings in the historical record: 2012 (composite +0.95 in July, drought-era early silking, corn rallied 650 cents per bushel to above 800 cents by late July); 2010 (composite +0.98 in July, warm-spring belt-ahead). Extreme-neg counter-examples: 2019 (composite -1.00 in July, flood-driven delay); 2013 (cold-spring belt delay); 2015 (Midwest wet planting).
COMPOSITE
+0.527 / tanh
STATE
Extreme Pos
PHASE
+1
FWD 60d
+3.26% (baseline +0.29%)
SAMPLE N
9,044 days
TODAY’S PLAYBOOK READING
STATE
Extreme Pos
STATE AND PERCENTILE
extreme-pos, 44 consecutive days. Composite at plus 0.5315 is at the 89.0 percentile of 26 years, upper-decile.
THE BIMODAL PATTERN ON THE AHEAD-PACE SIDE
moderate-pos state delivers minus 1.72 percent (HAC t minus 2.62 sig at 1 percent, pre-priced mild-ahead bear reaction). extreme-pos state delivers plus 4.67 percent (HAC t plus 4.53 sig at 1 percent, author-thesis-aligned pollination-vulnerability tail risk). The sign flips between the two states.
POSTURE FOR THE WEEKS AHEAD
extreme-pos has historically delivered plus 4.67 percent corn fwd 60d (edge plus 5.16 pp, HAC t plus 4.53 sig at 1 percent) , the strongest state-conditional edge in the Corn Cycle DNA input stack remains in the extreme-pos tail.
WHAT THE CHART SHOWS
The composite sits at +0.53 in the Belt Silking Ahead Of 5y Norm band, placing today’s reading at the 89th percentile of the full-history distribution. The blue signal line has been above the +0.2 moderate threshold since 2026-08-24 — 49 trading days in the ahead-pace tail. CBOT front-month corn (orange, right axis) is sitting at $4.48/bu, down from the summer peak but still trading above the behind-pace regime baseline.
TOP INPUTS FIRING
- Primary composite +0.53 State Belt Silking Ahead Of 5y Norm, 49 trading days running (since 2026-08-24).
- Belt-weighted silking pace Production-weighted average across Iowa, Illinois, Nebraska, Minnesota, Indiana — the five states that drive ~65% of US corn output.
- IC vs CBOT corn fwd 60d: Spearman +0.0817, p=5.7e-14 (N=8,433) Significant IC across the full history; sign is author-thesis-aligned on the ahead-pace tail.
THE TAKEAWAY
What this means for you today
WHAT BELT SILKING PACE IS TELLING YOU
The 2026 US Corn Belt silking pace ran BEHIND the five-year same-week average through the critical July pollination window; the signal was pinned at its -1.000 lower bound through mid-July. The flip to ahead-of-5y-norm occurred on 2026-08-24 as late-silking states completed their silking faster than the five-year same-week average. The pollination-vulnerability window is closed; the current reading is a post-season signature, not an active-mechanism firing.
THE PHENOLOGY-VULNERABILITY MECHANISM
Silking is the single most weather-vulnerable moment in the US corn growing cycle. The silks emerging from the husk must be pollinated within approximately a one-week window; heat stress above 95 Fahrenheit or water stress during that window directly reduces kernel count non-recoverably. When belt silking runs well ahead of the five-year pace, more of the production-dominant crop is at the vulnerable phenology stage during the hottest part of the July window (statistically, July 15-25 is the hottest period in the Corn Belt). The ahead-of-pace reading increases cumulative pollination-window heat-stress exposure across the national crop.
THE BIMODAL EMPIRICAL PATTERN
The 26-year state-conditional corn fwd 60d statistics show a bimodal pattern on the ahead-pace side mirroring the Corn Development Pace (State-Weighted Belt) Development Pace signal. moderate-pos state (belt mildly ahead of pace, val between plus 0.2 and plus 0.5) delivers minus 1.72 percent (HAC t minus 2.62 sig at 1 percent) , the pre-priced bear reaction. extreme-pos state (belt well ahead of pace, val above plus 0.5) delivers plus 4.67 percent (HAC t plus 4.53 sig at 1 percent) , the author-thesis-aligned pollination-vulnerability tail risk. The sign-flip pattern reflects markets pricing moderate silking-ahead narratives before the signal reaches extreme-pos; the extreme state is where tail-risk coverage pays.
THE REGIME MAP
The three belt-silking regime states, forward returns and sample share
Behavior across the state-weighted belt silking signal (CBOT corn benchmark, 1990-11-29 through present). Baseline corn unconditional fwd 60d is shown in the three-row table — the ‘Ahead of 5y norm’ tail is the pollination-vulnerability regime; the author thesis is that early belt-wide silking exposes production to the July heat window.
| State | Phase | Share | Fwd 60d | HAC t | Edge vs baseline | Last firings |
|---|---|---|---|---|---|---|
| Belt Silking Behind 5y Norm | – | 20.9% (1893 d) | +0.61% | +0.32pp | Jun 2026, Jul 2024, Nov 2023 | |
| Belt Silking At 5y Norm | 0 | 58.5% (5290 d) | -0.44% | -0.73pp | Aug 2026, Dec 2024, Aug 2023 | |
| Belt Silking Ahead Of 5y Norm TODAY | + | 20.6% (1861 d) | +3.26% | +2.97pp | Aug 2026, Jul 2024, Jul 2023 |
Twenty-six years of state-weighted belt silking pace dynamics, four scenes
The signal across 26 years of US Corn Belt silking history
THE TRACK RECORD
The last fourteen state transitions
14 transitions from 07/15/2024 to 10/23/2026 under the state-weighted belt methodology.
| State | Start | End | Duration | Fwd 60d SPY |
|---|---|---|---|---|
| Belt Silking Behind 5y Norm | 10/30/2024 | 12/24/2024 | 39d | +3.76% |
| Belt Silking At 5y Norm | 12/26/2024 | 06/12/2026 | 367d | -5.45% |
| Belt Silking Behind 5y Norm | 06/15/2026 | 08/14/2026 | 43d | +0.40% |
| Belt Silking At 5y Norm | 08/17/2026 | 08/21/2026 | 5d | |
| Belt Silking Ahead Of 5y Norm | 08/24/2026 | 10/30/2026 | 49d |
Scroll inside the table for the full history. Forward 60-day SPY is measured from each run’s start date; a reader cannot trade off a start-date they only identify in hindsight, so this is a transparency log, not an alpha claim. Asterisked (*) returns are partial. The run is less than 60 trading days old. The full 60-day comparable fills in as more data arrives.
What this measures
The engine queries USDA NASS Crop Progress state-level weekly silking percentage data from the estate weather database (`crop-progress-weekly` table with `agg_level=’STATE’`, `progress_stage=’SILKING’`, `location` column carrying state names). For each of ten production-weighted belt states (listed above, totaling approximately 90 percent of US corn production), computes the per-state five-year rolling same-week mean (requiring at least two prior years), the per-state pace = current reading minus five-year mean, weight-aggregates by state production share, forward-fills daily, z-scores on a 504-trading-day rolling window with 60-day minimum, and tanh-bounds. Five-state machine: extreme-neg below minus 0.5, moderate-neg between minus 0.5 and minus 0.2, NORMAL between plus-or-minus 0.2, moderate-pos between plus 0.2 and plus 0.5, extreme-pos above plus 0.5.
Why it matters
THE extreme-pos TAIL IS THE STRONGEST STATE-CONDITIONAL EDGE IN Corn Cycle DNA
Across 26 years of state-weighted belt history, the extreme-pos state of this signal delivers plus 4.67 percent mean corn fwd 60d with HAC Newey-West t plus 4.53 significant at the 1 percent level. This remains the strongest state-conditional edge among the seven Corn Cycle DNA input signals even after the state-weighted belt methodology patch. The economic logic: early belt silking pulls the vulnerable phenology window into the hottest part of July, concentrating heat-stress risk across the production-dominant states, which markets have historically priced with forward-return rally when the condition materializes.
THE SIGN-FLIP BETWEEN moderate-pos AND extreme-pos
The 26-year state-conditional corn fwd 60d statistics show a BIMODAL pattern on the ahead-pace side. moderate-pos state (val between plus 0.2 and plus 0.5, belt mildly ahead of pace) delivers minus 1.72 percent corn fwd 60d, HAC t minus 2.62 significant at 1 percent. extreme-pos state (val above plus 0.5, belt well ahead of pace) delivers plus 4.67 percent, HAC t plus 4.53 significant at 1 percent. The economic interpretation: moderate belt-silking-ahead narratives are pre-priced by markets by the time the signal reaches moderate-pos, leaving forward windows skewed to profit-taking. Extreme belt-silking-ahead creates uncompensated pollination-window tail risk that pays via forward rally. The sign-flip is a feature of the state-weighted belt methodology that the pre-patch national-aggregate signal did not surface.
APPROXIMATELY DUPLICATIVE WITH Corn Development Pace (State-Weighted Belt) IN Corn Cycle DNA
Corn Cycle DNA ingests this signal (silking pace) at 10 percent weight plus Corn Development Pace (State-Weighted Belt) Corn Development Pace (planting + emergence) at 20 percent weight. Both operate on NASS state-level Crop Progress belt-weighted data with methodologically-similar z-score constructions. The combined 30 percent weight on belt-phenology captures three sequential stages of the growing cycle (planting → emergence → silking) with cross-corroborating but non-independent reads. Readers should recognize the combined weight on belt-phenology as reflecting the empirical strength of the extreme-pos tail but calibrated to not over-weight a single data domain.
GO DEEPER
What state-weighted Corn Belt silking pace has meant for corn forward returns across 26 years of US pollination-window history
Full 10-minute research brief in PDF: the state-weighted belt methodology (ten states, approximately 90 percent of US corn production), the 2012 drought extreme-pos archetype, the 2019 flood-driven belt-delay extreme-neg counter-case, the 2010 warm-spring episode, the bimodal moderate-pos-vs-extreme-pos sign-flip empirical pattern, and the four documented limitations.
Signal consumers and companion lenses
Not investment advice · The analysis on this page is informational and educational. Signal readings, historical case figures, and empirical statistics are derived from publicly available data and are provided without warranty. Hypothetical performance results have inherent limitations, including the benefit of hindsight. Readers who intend to trade should consult a licensed investment professional and see the research brief for the full disclaimer.
Last refreshed Nov 02, 2026 10:43 AM ET