JARL Field Day Contest

JARL's field day: 2100 JST Saturday to 1500 Sunday on the first August weekend, worked portable across HF, VHF and UHF.

Rules at jarl.orgThe rules are the sponsor's. This page holds the dates and the facts.

When it runs

First Saturday of August

2100 Saturday → 1500 Sunday

Times are the sponsor's own clock in Asia/Tokyo, so the UTC instant moves an hour across a daylight-saving boundary. The runnings below are the resolved instants.

Next runnings

1200Z Sat 7 Aug → 0600Z Sun 8 Aug · 18h2027
in 310 days
1200Z Sat 5 Aug → 0600Z Sun 6 Aug · 18h2028
in 674 days
1200Z Sat 4 Aug → 0600Z Sun 5 Aug · 18h2029
in 1038 days
1200Z Sat 3 Aug → 0600Z Sun 4 Aug · 18h2030
in 1402 days

Operating

Modes: CW / SSB / FM AM
Bands: 160m80m40m20m15m10m6m2m70cm23cm
1.9 through 430 MHz plus every amateur band at 1200 MHz and above. The phone all-band categories exclude 14 MHz.
Exchange: On 1.9 MHz to 1200 MHz: RST, the prefecture or region number, and the power letter. On 2400 MHz and above: RST, the city, county or ward number, and the power letter.
Logs: no deadline or format recorded
Who can enter: Entry limited to JA. K stations may be worked but cannot submit an entry.
'2 参加資格日本国内のアマチュア局およびSWL（アマチュア局の電波を受信する個人をいう）' -- amateur stations within Japan, and SWLs. All four of JARL's domestic contests carry the same clause. A JA station can be WORKED from anywhere, which is why the record exists; entry is the part that is restricted.

Where this comes from

Checked against the sponsor: Yes. The rule on this page was read off JARL's own published rules. Link last confirmed 2026-08-19.
What the source says: jarl.org, フィールドデーコンテスト規約 (第69回): '1 開催日時毎年8月の第1土曜日の21時00分から翌日の15時00分（JST）まで。' -- the first Saturday of August, 21:00 to 15:00 the following day. The 2026 running is stated separately as '2026年8月1日（土）21時00分（JST）から8月2日（日）15時00分（JST）まで'. Bands: '3 使用周波数帯次の使用周波数帯および1200MHz帯以上の各アマチュアバンドとする'.
Recorded caveats: Same eighteen-hour shape as 6m AND DOWN a month earlier, and on all bands rather than VHF up. Encoded as wall_clock in Asia/Tokyo because that is how JARL states it -- 21時00分（JST） -- rather than converted to a fixed UTC time by hand. Japan has not observed daylight saving since 1952, so the two are identical in practice and will stay so; the record says what the sponsor said and lets the engine do the arithmetic. log_deadline_days is absent. JARL prints a dated deadline above the rules for the edition in hand -- ALL JA 2026 is '提出締切日 2026年5月6日（水）必着' -- and the numbered 規約 clauses that follow state the dates, eligibility, bands, categories and exchange but no submission span. All four of JARL's 2026 deadlines happen to fall exactly ten days after their contest ends, which is suggestive and is not a rule JARL wrote. The same reasoning already keeps a deadline off JARL's All Asian records.

Something wrong? How to report it — a link to the sponsor's own page is all it takes.

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