When Do States Stock Fish? A Month-by-Month Stocking Calendar (MT, UT, WA & NY)

State stocking records show a clear geographic split: Washington and New York stock hardest in spring — New York packs 37% of its year's stocking records into April alone — while Montana and Utah peak nearly two months later, in June and July, once high-elevation water opens up.

Key takeaways

• New York's stocking is the most concentrated of any live state: 37% of its recorded stockings with a known month land in April, and 77% land in the March–May window.
• Washington peaks almost as early — 28% of its records fall in April, with 75% of the year's stocking packed into March through June.
• Montana and Utah both peak in July (19% and 22% of their yearly records respectively), with June running a close second — roughly two months behind Washington and New York.
• In both Montana and Utah, about 77–80% of the year's stocking records fall between April and August — a longer, later season than the Pacific Northwest or Northeast.
• The split lines up with elevation and ice-out timing more than latitude: Montana and Utah's stocking waters sit much higher on average, so they thaw and warm later in the year.

How We Measured This

These figures come directly from each state's own stocking records in our database — every row with a known stocking month, grouped by month, for the four states with month-level data: Montana, Utah, Washington, and New York. (California is left out of this comparison; its stocking reports use a coarser species field that doesn't affect timing data, but we're keeping the comparison to states where our month-by-month breakdown is most complete.) Percentages reflect each state's share of its own total records with a known month — not raw counts, so states with very different total records still compare fairly.

Washington: Peaks Hardest in April

• March — 12.5% of Washington's recorded stockings.
• April — 27.9%, Washington's single busiest month.
• May — 23.9%.
• June — 11.2%.

Nearly three-quarters of Washington's yearly stocking (75.4%) happens in the four months from March through June — a compressed, early-spring season.

New York: The Most Concentrated Season of Any Live State

• March — 12.4% of New York's recorded stockings.
• April — 37.4%, by far the single busiest month recorded in any of the four states.
• May — 27.2%.

77% of New York's yearly stocking lands in just three months — March, April, and May — making it the most front-loaded stocking calendar of the four states we tracked.

Montana: A Long, Late-Summer Season

• May — 17.3% of Montana's recorded stockings.
• June — 18.3%.
• July — 19.3%, Montana's busiest month.
• August — 14.5%.

Montana's stocking spreads out more than Washington's or New York's: about 80% of the year's records fall across a five-month stretch, April through August, rather than clustering into two or three months.

Utah: Right Behind Montana, Peaking in July

• June — 21.8% of Utah's recorded stockings.
• July — 22.3%, Utah's busiest month.
• May — 15.6%.
• August — 10.8%.

Utah's pattern closely tracks Montana's — the same June–July peak, about two months behind Washington and New York — which fits both states' higher-elevation reservoirs and streams staying cold longer into the year.

Why the Timing Differs

The split isn't really about latitude — Montana sits north of Washington, yet stocks later, not earlier. It tracks elevation and ice-out instead. Washington's and New York's stocking waters, on average, sit at lower elevations that warm up and become fishable earlier in spring. Montana's and Utah's stocked waters include a larger share of high-elevation lakes and reservoirs that stay too cold — or still iced over — well into what would be "spring" at lower elevation, pushing the practical stocking season back toward early summer.

This is the same logic behind why fall stocking matters in every state — cooler water later in the year briefly re-opens a stocking window a second time, regardless of when the spring peak hit.

What This Means for Planning a Trip

If you're fishing Washington or New York, the stocking calendar rewards showing up early — waiting until July likely means the year's heaviest plants are behind you. In Montana or Utah, the opposite applies: a trip planned for May may be a full two months ahead of the season's real peak. Either way, a single recent stocking date matters less than knowing where your state sits in its own calendar.

For the mechanics of reading an individual stocking record once you've picked your timing, see our guide on how to read a fish stocking report.

Frequently Asked Questions

Which state stocks fish earliest in the year?

Of the four states with month-level data, New York and Washington both stock earliest, with April as their peak month — New York's April share (37.4% of its yearly total) is the most concentrated of any state we measured.

Why do Montana and Utah stock later than Washington and New York?

Elevation, not latitude, appears to be the main driver — Montana and Utah's stocked waters include more high-elevation lakes and reservoirs that stay cold or iced over later into what would otherwise be spring at lower elevations.

Does this mean fall stocking doesn't happen in these states?

No — every state shows at least some stocking outside its peak window, including a smaller fall bump as water cools again. The percentages above describe each state's dominant season, not its only one.

Is California included in this comparison?

No. California's public stocking reports use a coarser species field that isn't directly comparable to the month-by-month detail available for Montana, Utah, Washington, and New York, so it's excluded here rather than shown with lower-confidence numbers.