Crop year 2027 · sign-up deadline Dec 1, 2026
PRF insurance in Mariposa County, California: 2027 grids, values and record
Pasture, Rangeland, Forage (PRF) is USDA’s rainfall-index insurance for grazing land and hay ground. USDA’s 2027 files offer it in Mariposa County on 16 grids: 20440, 20441, 20739, 20740, 20741, 20742, 21039, 21040, 21041, 21042, 21043, 21339, 21340, 21341, 21342, 21343. It pays when precipitation in the grid over two months you choose comes in under a set share of normal.
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- Grids
- 16
- Grazing, county base value per acre
- $17.30
- Hay, non-irrigated, per acre
- —
- Hay, irrigated, per acre
- $107.00
- January to February cap
- 25%
- Sign-up deadline
- Dec 1, 2026
USDA’s 2027 county base values, the same on every grid in the county. Protection per acre is the value times your coverage level times a productivity factor of 60 to 150: grazing at 90% and 100 is $15.57 an acre.
Example: the calculator opens on April to May and June to July, and this county does not offer both for grazing, so no example is priced here. The calculator prices the months it does offer.
What each pair of months costs in Mariposa County
At 90% coverage, across the 16 grids that touch the county: the middle grid first, then the lowest and highest. The premium is the full rate per $100 of protection; USDA pays 59% at 70%, 59% at 75%, 55% at 80%, 55% at 85%, 51% at 90%. Normal is the grid’s average precipitation for those months. A year counts, of the 75 from 1951 to 2025, when the grid’s index for those months came in under 90% of normal, which is when a 90% policy pays.
| Months | Normal | Premium per $100 | Years under 90% |
|---|---|---|---|
| Jan-Feb | 9.97 in | $24.28 $23.24–25.97 | 38 35–41 |
| Feb-Mar | 9.25 in | $23.59 $21.31–24.54 | 37 35–39 |
| Mar-Apr | 7.18 in | $23.19 $21.97–24.65 | 39 38–43 |
| Apr-May | 3.48 in | $25.99 $20.17–31.00 | 38 36–41 |
| May-Jun | 1.20 in | $29.21 $24.10–42.94 | 42 40–43 |
| Jun-Jul | 0.27 in | $26.75 $26.75–29.02 | 37 37–40 |
| Jul-Aug | 0.08 in | $31.49 $31.49–34.13 | 39 39–42 |
| Aug-Sep | 0.37 in | $34.88 $34.88–40.35 | 44 44–46 |
| Sep-Oct | 1.70 in | $36.13 $28.00–42.65 | 40 39–42 |
| Oct-Nov | 4.73 in | $24.91 $23.24–26.81 | 38 36–40 |
| Nov-Dec | 8.15 in | $24.03 $21.58–27.15 | 37 33–41 |
The wettest pair of months here is January to February (9.97 in on the middle grid) and the driest is July to August (0.08 in). Coverage costs least in March to April and most in September to October. The months to insure are the ones when a dry spell costs you grass or hay, not the cheapest ones.
The last five years in Mariposa County, and 2026 so far
The index for each pair of months as a percent of normal (100 is a normal year), on the middle grid (each grid has its own; the calculator shows yours). Shaded cells came in under 90%, where a 90% policy on those months would have paid. 2026 shows the 6 pairs of months USDA has published so far.
| Months | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 so far |
|---|---|---|---|---|---|---|
| Jan-Feb | 71 | 2 | 184 | 129 | 74 | 85 |
| Feb-Mar | 34 | 18 | 184 | 144 | 149 | 52 |
| Mar-Apr | 37 | 50 | 178 | 117 | 129 | 63 |
| Apr-May | 14 | 58 | 31 | 102 | 53 | 133 |
| May-Jun | 8 | 6 | 105 | 77 | 14 | 28 |
| Jun-Jul | 16 | 17 | 88 | 23 | 3 | 4 |
| Jul-Aug | 109 | 145 | 283 | 108 | 71 | — |
| Aug-Sep | 22 | 240 | 185 | 22 | 115 | — |
| Sep-Oct | 235 | 60 | 31 | 8 | 155 | — |
| Oct-Nov | 100 | 53 | 38 | 82 | 175 | — |
| Nov-Dec | 127 | 162 | 45 | 90 | 130 | — |
Every year since 1951, priced at 2027 rates, is in the calculator.
PRF grids in Mariposa County
Each grid’s normal precipitation over a year, its driest year since 1951 as a percent of normal, 2025 as a percent of normal, and how many of 75 years as a whole came in under 90%. The driest year on the record here was 2013.
| Grid | Normal, year | Driest year | 2025 | Years under 90% | Calculator |
|---|---|---|---|---|---|
| 20440 | 12.1 in | 2013, 35% | 110% | 32 | Open |
| 20441 | 15.2 in | 2013, 30% | 123% | 29 | Open |
| 20739 | 13.4 in | 2013, 32% | 105% | 32 | Open |
| 20740 | 18.5 in | 2013, 30% | 110% | 31 | Open |
| 20741 | 26.1 in | 2013, 27% | 115% | 31 | Open |
| 20742 | 34.0 in | 2013, 27% | 114% | 34 | Open |
| 21039 | 18.9 in | 2013, 31% | 107% | 32 | Open |
| 21040 | 28.0 in | 2013, 28% | 108% | 31 | Open |
| 21041 | 33.8 in | 2013, 28% | 104% | 32 | Open |
| 21042 | 44.6 in | 2013, 30% | 102% | 31 | Open |
| 21043 | 45.9 in | 2013, 30% | 103% | 32 | Open |
| 21339 | 28.2 in | 2013, 31% | 96% | 32 | Open |
| 21340 | 37.0 in | 2013, 29% | 94% | 32 | Open |
| 21341 | 39.2 in | 2013, 31% | 95% | 31 | Open |
| 21342 | 48.3 in | 2013, 33% | 102% | 32 | Open |
| 21343 | 36.1 in | 2013, 34% | 105% | 30 | Open |
PRF dates for 2027
- Dec 1, 2026: sales closing. New policies and changes are due at your agent.
- Dec 1, 2026: acreage report.
- Sep 1, 2027: premium billed, no earlier than this.
From 2027, grazing acres need livestock you have an interest in, equal to at least 25% of the stocking rate, or no payment is due and the premium is still owed. PRF pays on the grid’s precipitation index, not on your production. How PRF works · Before you sign · PRF in California
PRF questions in Mariposa County
When is the PRF deadline in Mariposa County for 2027?
The sales closing date is Dec 1, 2026, the same across the country. The acreage report is due Dec 1, 2026, and the premium is billed no earlier than Sep 1, 2027.
Which PRF grid is Mariposa County in?
Grids 20440, 20441, 20739, 20740, 20741, 20742, 21039, 21040, 21041, 21042, 21043, 21339, 21340, 21341, 21342, 21343 touch Mariposa County. A grid is a quarter degree of latitude by a quarter degree of longitude, about 17 miles north to south. Your grid follows from a point inside the acres you insure; type a ZIP or coordinates in the calculator to find it.
How much does PRF cost per acre in Mariposa County?
It depends on the grid, the months, the coverage level and your productivity factor. USDA’s 2027 county base value is $17.30 an acre for grazing. At 90% coverage and a productivity factor of 100, grazing land is protected for $15.57 an acre, and the full premium runs $23.19 to $36.13 per $100 of protection depending on the months, on the middle grid. USDA pays 51% to 59% of the premium. The calculator gives the figure for your acres and months.
How often has PRF paid in Mariposa County?
At 90% coverage a pair of months pays when the index comes in under 90% of normal. Over 1951 to 2025, on the middle grid, that happened in 37 to 44 of 75 years, depending on the months. Run at 2027 rates, $1 of full premium at 90% would have paid back a middle $0.88 across the county’s grids and months. That is the past record, not a forecast.
PRF in California · Mariposa County in the Farmland Atlas · PRF calculator