Fall in zone 6aPhoto: Dietmar Rabich, CC BY-SA 4.0, via Wikimedia Commons
Frost dates for ZIP 84003 (American Fork, UT)
Average last spring and first fall frost dates with 10%, 50% and 90% odds, from NOAA's 1991–2020 climate normals for the nearest weather station, Timpanogos Cave, UT (2 miles away).
- Average last spring frostMay 250% chance of a 32°F freeze after this date
- Average first fall frostOct 1650% chance of a 32°F freeze by this date
- Growing season (frost-free)161 daysmedian, 32°F threshold
- USDA hardiness zone6a-10 to -5°F avg. coldest night
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This week in your yard
As of Oct 18, 2026, from your frost dates, zone and soil temperature. Lawn timing · Vegetables · Pruning · Plants
Soil temperature now
2-inch depth
51°F 50–55°F
24-hour average · latest 48°F, as of Oct 18, 2:00 AM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Morgan (36 mi), Grantsville (38 mi), Nephi (58 mi).
4-inch depth
52°F 50–55°F
24-hour average · latest 52°F, as of Oct 18, 2:00 AM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Morgan (36 mi), Grantsville (38 mi).
Fall: Texas A&M AgriLife times fall pre-emergent (for winter weeds such as annual bluegrass) to soil cooling to about 70°F for several days. The 50–55°F band is the spring trigger. Always read and follow the product label.
7-day forecast and frost risk
The latest National Weather Service 7-day forecast and any Frost Advisory or Freeze Warning for 84003 load here. You can also open the NWS forecast for this ZIP.
Pre-emergent
Soil is 52°F at 4 inches (estimated soil temperature, not a station reading). Fall pre-emergent window is mostly past. Next: spring, when soil reaches 50°F (typically mid-April to mid-May).
Fertilizer window
Lawn region: Mountain West and High Plains. Timing only; always follow the product label.
- Kentucky bluegrass (cool-season): Early fall: Around Labor Day (late August–September); Late fall: Late October–November, before the ground freezes; Late spring: Optional around Memorial Day. Avoid: Early-spring and midsummer feeding (pushes top growth, favors crabgrass).
Plant now
No vegetable planting windows are open this week.
Prune now
No frost-timed pruning windows are open this week.
Spring-flowering shrubs are pruned right after their flowers fade, not by date. See the pruning guide.
Last spring frost odds
| Chance of a 32°F freeze after this date | Date |
|---|---|
| 90% (early: most years still freeze after this) | Apr 17 |
| 50% (the "average" last frost) | May 2 |
| 10% (cautious: only 1 year in 10 freezes later) | May 26 |
Most gardeners plant frost-tender crops (tomatoes, peppers, basil) after the 50% date, and closer to the 10% date for less risk.
First fall frost odds
| Chance the first 32°F freeze has happened by this date | Date |
|---|---|
| 10% (early: 1 year in 10 freezes this soon) | Oct 1 |
| 50% (the "average" first frost) | Oct 16 |
| 90% (late: most years have frozen by now) | Oct 31 |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | May 21 | Oct 3 |
| 32°F (freeze) | May 2 | Oct 16 |
| 28°F (hard freeze) | Apr 16 | Oct 26 |
n/a means NOAA did not publish a date at that threshold for this station (usually because it rarely gets that cold).
Vegetable planting calendar for 84003
Dates count from your average last spring frost (May 2) and first fall frost (Oct 16). Half of years have a frost after the spring date, so give tender crops (tomatoes, peppers, squash) some slack.
| Crop | Start indoors | Spring planting | Fall planting |
|---|---|---|---|
| Tomato | Mar 7–21 | May 9–23 (transplant) | – |
| Pepper (sweet and hot) | Feb 21–Mar 7 | May 16–30 (transplant) | – |
| Eggplant | Feb 21–Mar 7 | May 16–30 (transplant) | – |
| Tomatillo | Mar 7–21 | May 9–23 (transplant) | – |
| Lettuce | Mar 7–21 | Apr 11–May 2 (transplant) Apr 4–May 16 (sow outdoors) | Aug 21–Sep 11 (transplant) Aug 7–Sep 4 (sowing) |
| Spinach | – | Mar 21–Apr 11 (sow outdoors) | Aug 21–Sep 11 (sowing) |
| Kale | Mar 7–21 | Apr 4–18 (transplant) Apr 4–18 (sow outdoors) | Jul 24–Aug 21 (transplant) Jul 10–Aug 7 (sowing) |
| Collards | Mar 7–21 | Apr 4–May 2 (transplant) Apr 4–May 2 (sow outdoors) | Jul 24–Aug 21 (transplant) Jul 10–Aug 7 (sowing) |
| Broccoli | Feb 21–Mar 7 | Apr 4–18 (transplant) | Jul 10–Aug 7 (transplant) |
| Cabbage | Feb 21–Mar 7 | Apr 4–18 (transplant) | Jul 10–Aug 7 (transplant) |
| Cauliflower | Feb 21–Mar 7 | Apr 18–May 2 (transplant) | Jul 10–Aug 7 (transplant) |
| Brussels sprouts | Feb 7–21 | Apr 4–18 (transplant) | Jun 26–Jul 17 (transplant) |
| Kohlrabi | Mar 7–21 | Apr 4–18 (transplant) Apr 4–18 (sow outdoors) | Aug 7–21 (sowing) |
| Bok choy / Asian greens | – | Apr 4–18 (sow outdoors) | Aug 21–Sep 4 (sowing) |
| Arugula | – | Apr 4–May 2 (sow outdoors) | Aug 21–Sep 18 (sowing) |
| Mustard greens | – | Apr 4–25 (sow outdoors) | Aug 21–Sep 4 (sowing) |
| Swiss chard | Mar 21–Apr 4 | Apr 18–May 9 (transplant) Apr 18–May 16 (sow outdoors) | Aug 7–21 (sowing) |
| Beet | – | Apr 4–May 2 (sow outdoors) | Aug 7–21 (sowing) |
| Carrot | – | Apr 11–May 9 (sow outdoors) | Jul 24–Aug 7 (sowing) |
| Radish | – | Mar 28–May 9 (sow outdoors) | Sep 4–18 (sowing) |
| Turnip | – | Apr 4–25 (sow outdoors) | Aug 7–21 (sowing) |
| Parsnip | – | Apr 11–May 2 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Mar 7–Apr 4 (sow outdoors) | Jul 24–Aug 7 (sowing) |
| Onion (bulbing) | Feb 7–21 | Mar 21–Apr 4 (transplant) | – |
| Green onion / scallion | – | Mar 21–Apr 18 (sow outdoors) | Aug 7–21 (sowing) |
| Leek | Feb 7–21 | Apr 4–18 (transplant) | – |
| Garlic | – | – | Sep 4–Oct 2 (sowing) |
| Shallot | – | Mar 21–Apr 4 (transplant) | Sep 4–Oct 2 (sowing) |
| Potato | – | Apr 4–18 (transplant) | Jun 26–Jul 10 (transplant) |
| Sweet potato | – | May 23–Jun 6 (transplant) | – |
| Sweet corn | – | May 9–23 (sow outdoors) | – |
| Bean, bush (snap) | – | May 9–23 (sow outdoors) | – |
| Bean, pole | – | May 9–23 (sow outdoors) | – |
| Lima bean | – | May 16–30 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | May 23–Jun 13 (sow outdoors) | – |
| Cucumber | Apr 4–11 | May 9–23 (transplant) May 9–23 (sow outdoors) | – |
| Summer squash / zucchini | Apr 4–11 | May 9–23 (transplant) May 9–23 (sow outdoors) | – |
| Winter squash | Apr 4–11 | May 9–23 (transplant) May 9–23 (sow outdoors) | – |
| Pumpkin | – | May 9–23 (sow outdoors) | – |
| Watermelon | Apr 4–11 | May 16–30 (transplant) May 16–30 (sow outdoors) | – |
| Cantaloupe / muskmelon | Apr 4–11 | May 16–30 (transplant) May 16–30 (sow outdoors) | – |
| Okra | Mar 21–Apr 4 | May 16–30 (transplant) May 16–30 (sow outdoors) | – |
| Celery | Feb 7–21 | May 9–16 (transplant) | – |
| Basil | Mar 21–Apr 4 | May 9–23 (transplant) May 9–23 (sow outdoors) | – |
| Cilantro | – | Apr 18–May 16 (sow outdoors) | Aug 21–Sep 4 (sowing) |
| Parsley | Feb 21–Mar 7 | Apr 18–May 2 (transplant) Apr 11–May 2 (sow outdoors) | – |
| Dill | – | May 2–16 (sow outdoors) | Aug 21–Sep 4 (sowing) |
| Sunflower | – | May 2–16 (sow outdoors) | – |
| Asparagus (crowns) | – | Apr 4–18 (transplant) | – |
| Rhubarb (crowns) | – | Apr 4–18 (transplant) | – |
| Strawberry (plants) | – | Apr 4–18 (transplant) | Aug 7–Sep 4 (transplant) |
Typical ranges from university extension planting calendars, adjusted to your frost dates. Probabilities, not guarantees. Fall windows that would overlap spring planting are left out, as are fall crops of frost-tender plants where the frost-free season is under 210 days.
Where these numbers come from
Station: Timpanogos Cave, UT (NOAA GHCN-Daily ID USC00428733), elevation 5,740 ft, 2.4 miles from the ZIP's center point. NOAA completeness flag: R (representative, 10+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Alpine, UT | 5 mi | May 3 | Oct 12 |
| Pleasant Grove, UT | 8 mi | Apr 17 | Oct 25 |
| Sundance, UT | 8 mi | May 17 | Oct 5 |
The average last-frost dates of these stations span 31 days, a rough guide to local variation. See data sources & methods.
Frost questions for 84003
When is the last frost in 84003?
The average (50% chance) last spring freeze of 32°F for ZIP 84003 is May 2. For a more cautious planting date, use May 26, when only 1 year in 10 still sees a later freeze.
When is the first frost in 84003?
The average first fall freeze is October 16. In 1 year in 10 it comes by October 1.
What hardiness zone is 84003?
ZIP 84003 is in USDA zone 6a (-10 to -5°F average coldest winter night), per the 2023 USDA Plant Hardiness Zone Map ZIP listing.
What is the soil temperature in 84003 right now?
This page shows the latest 2-inch and 4-inch soil temperature from the nearest public soil station (USDA SCAN, NOAA USCRN or TexMesonet), or a labeled estimate when no station is close, against the 50–55°F spring pre-emergent band.
Nearby ZIP codes
84004 Alpine 84092 Sandy 84062 Pleasant Grove 84049 Midway 84042 Lindon 84020 Draper 84121 Brighton 84057 Orem
Other ZIP codes in Utah County
84004 84005 84013 84042 84043 84045 84057 84058 84059 84062 84097 84601 84602 84604 84606 84626 84633 84651 84653 84655 84660 84663 84664 All Utah County frost dates · Utah frost dates
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Weekly yard timing, plus frost and soil-temperature alerts for your ZIP code.
- Freeze alerts
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Free. One weekly email plus alerts when your ZIP has a frost or a soil-temperature change worth acting on. After you submit, Kit (our email provider) sends a confirmation email: check your email and click the link to confirm. You aren't subscribed until you do. We collect only your email address and ZIP, sent to Kit to deliver The Dial. Unsubscribe anytime.