Contest Calendar¶
Updated 03:00 UTC 2026-04-07
Next 30 Days¶
JIDX CW¶
4 days until start
| Start | 2026-04-11 07:00 UTC |
| End | 2026-04-12 13:00 UTC |
| Duration | 30 hours |
| Modes | CW |
| Bands | 80m, 40m, 20m, 15m, 10m |
| Sponsor | JARL |
Japan International DX — CW, JA stations work the world
Full Year Calendar¶
| Contest | Date (UTC) | Start | Hours | Modes | Countdown |
|---|---|---|---|---|---|
| JIDX CW | Apr 11–12 | Sat 07:00 | 30 | CW | 4 days |
| CQ WPX CW | May 30–01 | Sat 00:00 | 48 | CW | 7w 3d |
| All Asian DX CW | Jun 20–22 | Sat 00:00 | 48 | CW | 10w 3d |
| IARU HF Championship | Jul 11–12 | Sat 12:00 | 24 | SSB/CW | 13w 4d |
| WAE CW | Aug 08–10 | Sat 00:00 | 48 | CW | 17w 3d |
| All Asian DX SSB | Sep 05–07 | Sat 00:00 | 48 | SSB | 21w 3d |
| WAE SSB | Sep 12–14 | Sat 00:00 | 48 | SSB | 22w 3d |
| SAC CW | Sep 19–20 | Sat 12:00 | 24 | CW | 23w 4d |
| CQ WW RTTY | Sep 26–28 | Sat 00:00 | 48 | RTTY | 24w 3d |
| Oceania DX SSB | Oct 03–04 | Sat 06:00 | 24 | SSB | 25w 4d |
| Oceania DX CW | Oct 10–11 | Sat 06:00 | 24 | CW | 26w 4d |
| SAC SSB | Oct 17–18 | Sat 12:00 | 24 | SSB | 27w 4d |
| CQ WW SSB | Oct 24–26 | Sat 00:00 | 48 | SSB | 28w 3d |
| WAE RTTY | Nov 14–16 | Sat 00:00 | 48 | RTTY | 31w 3d |
| JIDX SSB | Nov 14–15 | Sat 07:00 | 30 | SSB | 31w 4d |
| CQ WW CW | Nov 28–30 | Sat 00:00 | 48 | CW | 33w 3d |
| ARRL 160m | Dec 04–06 | Fri 22:00 | 42 | CW | 34w 3d |
| ARRL 10m | Dec 12–14 | Sat 00:00 | 48 | SSB/CW | 35w 3d |
| CQ 160m CW | Jan 29–31 | Fri 22:00 | 48 | CW | 42w 3d |
| CQ WPX RTTY | Feb 13–15 | Sat 00:00 | 48 | RTTY | 44w 3d |
| ARRL DX CW | Feb 20–22 | Sat 00:00 | 48 | CW | 45w 3d |
| CQ 160m SSB | Feb 26–28 | Fri 22:00 | 48 | SSB | 46w 3d |
| ARRL DX SSB | Mar 06–08 | Sat 00:00 | 48 | SSB | 47w 3d |
| CQ WPX SSB | Mar 27–29 | Sat 00:00 | 48 | SSB | 50w 3d |
Contest Weekend Recaps¶
Post-contest propagation analysis — band activity, solar impact, geographic reach. Each recap includes a full Jupyter notebook and downloadable SQLite dataset.
- ARRL DX SSB 2026 — Storm onset during contest (Kp 1.0 → 4.67)
- ARRL DX CW 2026 — SSN dropped to zero during G1 storm
DXpeditions¶
See the DXpeditions page for upcoming DXpedition tracking with IONIS band predictions.
Logger Statistics¶
Which logging software do contesters use? See the Logger Statistics page for market share data from 496K+ Cabrillo log submissions — N1MM dominates at 45%, but macOS and Linux have essentially zero contest logger presence.
About This Calendar¶
Contest dates are computed from fixed scheduling rules — "last full weekend of October," "first full weekend of March," etc. The rules rarely change. A YAML file plus Python date math produces a calendar that stays current without manual updates.
"Full weekend" means both Saturday and Sunday fall within the named month. Some contests start Friday evening (CQ 160m, ARRL 160m). Durations range from 24 hours (IARU, SAC, Oceania) to 48 hours (CQ WW, WPX).
Predictions use IONIS V22-gamma — a physics-constrained neural network trained on 14 billion real propagation observations. They reflect current solar conditions and update every 3 hours.