Data: 2023 USDA zones (PRISM/OSU) · NOAA 1991–2020 normals · updated

Planting zone for 84071 — Stockton, UT

ZIP code 84071 (Stockton, Tooele County) is in USDA zone 6b: the coldest winter night averages −5 to 0 °F. The median last spring frost is June 2 and the first fall frost September 16.

Where ZIP 84071 is

Outlined: the ZIP code area · tap the map for the zone at any spot · scroll or pinch to zoom

Not the official USDA Plant Hardiness Zone Map. Zones come from the 2023 USDA hardiness-zone data by the PRISM Group, Oregon State University; we re-mapped and recolored them. The official map is at planthardiness.ars.usda.gov.

Zone6b−5 to 0 °F
Coldest night−20.6 to −17.8 °C
Last frostJun 2
First frostSep 16
2012 zone6a

Was 6a on the 2012 map — half a zone warmer now. The zone is the one at the center of the ZIP code; hilly ZIPs can span two zones. What zone 6b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Stockton, UT…

Forecast data: National Weather Service (api.weather.gov), public domain. This is not a warning service — for official frost and freeze warnings see weather.gov.

Frost dates in Stockton, UT

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostJune 2median — 50% chance of a later frost
Safe for tender plantsJune 24only 10% chance of frost after
First fall frostSeptember 16median — 10% chance by Sep 1
Growing season103 daysfrost-free, median

A hard freeze (28 °F) usually ends around May 19 and returns around September 26.

From the NOAA station Fairfield, UT — 11 miles away, elevation 4,879 ft. NOAA NCEI U.S. Climate Normals 1991–2020, 32 °F threshold. Low spots and valleys can freeze later in spring than the station.

When to plant vegetables in 84071

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Apr 21 – May 5
SpinachSow outdoors · Apr 21 – May 12
Broccoli, cabbageStart indoors · Mar 24 – Apr 7
Broccoli, cabbageTransplant · May 12 – May 26
Onion setsPlant outdoors · May 5 – May 19
PotatoesPlant outdoors · May 12 – May 26
LettuceSow outdoors · May 5 – May 19
Carrots, beetsSow outdoors · May 12 – May 26
TomatoesStart indoors · Apr 7 – Apr 21
TomatoesTransplant · Jun 9 – Jun 23
Peppers, eggplantStart indoors · Mar 24 – Apr 7
Peppers, eggplantTransplant · Jun 16 – Jun 30
BeansSow outdoors · Jun 9 – Jun 23
Sweet cornSow outdoors · Jun 9 – Jun 23
Cucumbers, squashSow outdoors · Jun 9 – Jun 23
Fall lettuce, spinachSow outdoors · Jul 22 – Aug 5
GarlicPlant cloves · Sep 2 – Oct 7
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Jun 2) and first fall frost (Sep 16) with the rules of thumb U.S. extension services publish. Cool-season crops take a light frost; warm-season crops do best once the soil is above about 60 °F.

When spring arrived in 2026

In 2026, spring leaf-out near 84071 came on Mar 23 — 25 days earlier than the 1991–2020 average (Apr 17).

JanFebMarAprMayJun

The Spring Index marks the day when accumulated warmth is enough for lilac and honeysuckle to leaf out — a widely used signal that the growing season has started. Source: USA National Phenology Network, www.usanpn.org — Spring Indices, first leaf, 2026 (data as of 2026-09-08) and 30-year average 1991–2020 (CC BY 4.0).

Soil in Stockton, UT

The soil mapped at the center of ZIP 84071 is Lodar — very cobbly loam, well drained.

TextureVery cobbly loama good balance for most vegetables
pH7.9alkaline; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter3%moderate
Hydrologic groupDwater soaks in very slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Lodar-Lundy-Rock outcrop association, 30 to 60 percent slopes.

Soil Survey Staff, Natural Resources Conservation Service, USDA. Soil Survey Geographic (SSURGO) Database, via Soil Data Access, accessed 2026-10-29. The soil at the center point of ZIP 84071; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Stockton, UT

Summer high90 °Faverage high, July
Winter low13 °Faverage low, January
Hot days43days a year at 90 °F or more
Freezing nights197nights a year at 32 °F or less
Growing degree days2,217base 50 °F — the season’s usable heat
Longest day15 h 03 mindaylight on June 21
Shortest day9 h 17 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation40 inper year, rain and melted snow

Average high and low, by month

0°10°20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 39 °F, low 13 °F 39°13° JanFebruary: average high 45 °F, low 18 °F 45°18° FebMarch: average high 56 °F, low 25 °F 56°25° MarApril: average high 63 °F, low 30 °F 63°30° AprMay: average high 72 °F, low 37 °F 72°37° MayJune: average high 83 °F, low 44 °F 83°44° JunJuly: average high 90 °F, low 51 °F 90°51° JulAugust: average high 89 °F, low 49 °F 89°49° AugSeptember: average high 80 °F, low 40 °F 80°40° SepOctober: average high 67 °F, low 29 °F 67°29° OctNovember: average high 52 °F, low 20 °F 52°20° NovDecember: average high 40 °F, low 13 °F 40°13° Dec

Precipitation by month inches

0″1″2″3″4″5″6″January: 4.30 in precipitation 4.3 JanFebruary: 4.34 in precipitation 4.3 FebMarch: 4.92 in precipitation 4.9 MarApril: 5.26 in precipitation 5.3 AprMay: 3.86 in precipitation 3.9 MayJune: 1.78 in precipitation 1.8 JunJuly: 1.33 in precipitation 1.3 JulAugust: 1.42 in precipitation 1.4 AugSeptember: 1.95 in precipitation 1.9 SepOctober: 3.18 in precipitation 3.2 OctNovember: 3.52 in precipitation 3.5 NovDecember: 4.17 in precipitation 4.2 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Fairfield, UT (11 mi away); precipitation: Rocky Basin-Settleme, UT (6 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

7 of the 8 nearest ZIP codes are in a different zone — elevation and distance from water change winter lows quickly.

840136a
Cedar Valley, UT · 10 mi
840696a
Rush Valley, UT · 11 mi
840967a
Herriman, UT · 13 mi
840747a
Tooele, UT · 16 mi
840067a
Bingham Canyon, UT · 18 mi
840097a
South Jordan, UT · 19 mi
840226b
Dugway, UT · 20 mi
840817b
West Jordan, UT · 21 mi

Utah planting zones →

Questions about 84071

What planting zone is ZIP code 84071?

ZIP code 84071 (Stockton, UT) is in USDA hardiness zone 6b on the 2023 map: the coldest night of an average winter reaches −5 to 0 °F (−20.6 to −17.8 °C).

When is the last frost in Stockton, UT?

The median last spring frost (32 °F) near 84071 is June 2; after June 24 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Fairfield station.

When is the first frost in Stockton, UT?

The median first fall frost near 84071 is September 16, giving a median frost-free growing season of 103 days.

When should I plant tomatoes in 84071?

Start tomato seeds indoors around Apr 7 – Apr 21 and set transplants outside around Jun 9 – Jun 23, one to three weeks after the median last frost.

How much rain and snow does 84071 get?

About 40 inches of precipitation a year (NOAA 1991–2020 normals, Rocky Basin-Settleme station).

How hot do summers get in Stockton, UT?

The average high peaks at 90 °F in July, with about 43 days a year at 90 °F or more.

What kind of soil does 84071 have?

The USDA soil survey maps Lodar at the center of ZIP 84071: very cobbly loam, well drained, pH about 7.9 (alkaline).

Did spring come early in Stockton, UT in 2026?

Spring leaf-out near 84071 came on Mar 23 in 2026, 25 days earlier than the 1991–2020 average (Apr 17), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Stockton, UT?

Long-day onions: the longest day near 84071 is 15 h 03 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 84071 change?

Yes. The 2012 USDA map put 84071 in zone 6a; the 2023 map puts it in zone 6b. The newer map uses 1991–2020 data and more weather stations.