Fall in zone 6bPhoto: Dietmar Rabich, CC BY-SA 4.0, via Wikimedia Commons
Frost dates for ZIP 84663 (Springville, 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, Provo Byu, UT (9 miles away).
- Average last spring frostApr 1850% chance of a 32°F freeze after this date
- Average first fall frostOct 2150% chance of a 32°F freeze by this date
- Growing season (frost-free)185 daysmedian, 32°F threshold
- USDA hardiness zone6b-5 to 0°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 Nephi (43 mi), Grantsville (55 mi), Morgan (57 mi).
4-inch depth
51°F 50–55°F
24-hour average · latest 51°F, as of Oct 18, 2:00 AM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Grantsville (55 mi), Morgan (57 mi), Ephraim (57 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 84663 load here. You can also open the NWS forecast for this ZIP.
Pre-emergent
Soil is 51°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.
Your average first frost is Oct 21: skip heavy pruning in the 6–8 weeks before it, because new growth may not harden off in time.
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) | Mar 31 |
| 50% (the "average" last frost) | Apr 18 |
| 10% (cautious: only 1 year in 10 freezes later) | May 5 |
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 7 |
| 50% (the "average" first frost) | Oct 21 |
| 90% (late: most years have frozen by now) | Nov 4 |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | May 3 | Oct 10 |
| 32°F (freeze) | Apr 18 | Oct 21 |
| 28°F (hard freeze) | Mar 31 | Nov 1 |
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 84663
Dates count from your average last spring frost (Apr 18) and first fall frost (Oct 21). 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 | Feb 21–Mar 7 | Apr 25–May 9 (transplant) | – |
| Pepper (sweet and hot) | Feb 7–21 | May 2–16 (transplant) | – |
| Eggplant | Feb 7–21 | May 2–16 (transplant) | – |
| Tomatillo | Feb 21–Mar 7 | Apr 25–May 9 (transplant) | – |
| Lettuce | Feb 21–Mar 7 | Mar 28–Apr 18 (transplant) Mar 21–May 2 (sow outdoors) | Aug 26–Sep 16 (transplant) Aug 12–Sep 9 (sowing) |
| Spinach | – | Mar 7–28 (sow outdoors) | Aug 26–Sep 16 (sowing) |
| Kale | Feb 21–Mar 7 | Mar 21–Apr 4 (transplant) Mar 21–Apr 4 (sow outdoors) | Jul 29–Aug 26 (transplant) Jul 15–Aug 12 (sowing) |
| Collards | Feb 21–Mar 7 | Mar 21–Apr 18 (transplant) Mar 21–Apr 18 (sow outdoors) | Jul 29–Aug 26 (transplant) Jul 15–Aug 12 (sowing) |
| Broccoli | Feb 7–21 | Mar 21–Apr 4 (transplant) | Jul 15–Aug 12 (transplant) |
| Cabbage | Feb 7–21 | Mar 21–Apr 4 (transplant) | Jul 15–Aug 12 (transplant) |
| Cauliflower | Feb 7–21 | Apr 4–18 (transplant) | Jul 15–Aug 12 (transplant) |
| Brussels sprouts | Jan 24–Feb 7 | Mar 21–Apr 4 (transplant) | Jul 1–22 (transplant) |
| Kohlrabi | Feb 21–Mar 7 | Mar 21–Apr 4 (transplant) Mar 21–Apr 4 (sow outdoors) | Aug 12–26 (sowing) |
| Bok choy / Asian greens | – | Mar 21–Apr 4 (sow outdoors) | Aug 26–Sep 9 (sowing) |
| Arugula | – | Mar 21–Apr 18 (sow outdoors) | Aug 26–Sep 23 (sowing) |
| Mustard greens | – | Mar 21–Apr 11 (sow outdoors) | Aug 26–Sep 9 (sowing) |
| Swiss chard | Mar 7–21 | Apr 4–25 (transplant) Apr 4–May 2 (sow outdoors) | Aug 12–26 (sowing) |
| Beet | – | Mar 21–Apr 18 (sow outdoors) | Aug 12–26 (sowing) |
| Carrot | – | Mar 28–Apr 25 (sow outdoors) | Jul 29–Aug 12 (sowing) |
| Radish | – | Mar 14–Apr 25 (sow outdoors) | Sep 9–23 (sowing) |
| Turnip | – | Mar 21–Apr 11 (sow outdoors) | Aug 12–26 (sowing) |
| Parsnip | – | Mar 28–Apr 18 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Feb 21–Mar 21 (sow outdoors) | Jul 29–Aug 12 (sowing) |
| Onion (bulbing) | Jan 24–Feb 7 | Mar 7–21 (transplant) | – |
| Green onion / scallion | – | Mar 7–Apr 4 (sow outdoors) | Aug 12–26 (sowing) |
| Leek | Jan 24–Feb 7 | Mar 21–Apr 4 (transplant) | – |
| Garlic | – | – | Sep 9–Oct 7 (sowing) |
| Shallot | – | Mar 7–21 (transplant) | Sep 9–Oct 7 (sowing) |
| Potato | – | Mar 21–Apr 4 (transplant) | Jul 1–15 (transplant) |
| Sweet potato | – | May 9–23 (transplant) | – |
| Sweet corn | – | Apr 25–May 9 (sow outdoors) | – |
| Bean, bush (snap) | – | Apr 25–May 9 (sow outdoors) | – |
| Bean, pole | – | Apr 25–May 9 (sow outdoors) | – |
| Lima bean | – | May 2–16 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | May 9–30 (sow outdoors) | – |
| Cucumber | Mar 21–28 | Apr 25–May 9 (transplant) Apr 25–May 9 (sow outdoors) | – |
| Summer squash / zucchini | Mar 21–28 | Apr 25–May 9 (transplant) Apr 25–May 9 (sow outdoors) | – |
| Winter squash | Mar 21–28 | Apr 25–May 9 (transplant) Apr 25–May 9 (sow outdoors) | – |
| Pumpkin | – | Apr 25–May 9 (sow outdoors) | – |
| Watermelon | Mar 21–28 | May 2–16 (transplant) May 2–16 (sow outdoors) | – |
| Cantaloupe / muskmelon | Mar 21–28 | May 2–16 (transplant) May 2–16 (sow outdoors) | – |
| Okra | Mar 7–21 | May 2–16 (transplant) May 2–16 (sow outdoors) | – |
| Celery | Jan 24–Feb 7 | Apr 25–May 2 (transplant) | – |
| Basil | Mar 7–21 | Apr 25–May 9 (transplant) Apr 25–May 9 (sow outdoors) | – |
| Cilantro | – | Apr 4–May 2 (sow outdoors) | Aug 26–Sep 9 (sowing) |
| Parsley | Feb 7–21 | Apr 4–18 (transplant) Mar 28–Apr 18 (sow outdoors) | – |
| Dill | – | Apr 18–May 2 (sow outdoors) | Aug 26–Sep 9 (sowing) |
| Sunflower | – | Apr 18–May 2 (sow outdoors) | – |
| Asparagus (crowns) | – | Mar 21–Apr 4 (transplant) | – |
| Rhubarb (crowns) | – | Mar 21–Apr 4 (transplant) | – |
| Strawberry (plants) | – | Mar 21–Apr 4 (transplant) | Aug 12–Sep 9 (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: Provo Byu, UT (NOAA GHCN-Daily ID USC00427064), elevation 4,570 ft, 9.3 miles from the ZIP's center point. NOAA completeness flag: S (standard, 24+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Spanish Fk Pwr House, UT | 10 mi | Apr 25 | Oct 18 |
| Orem Trtmt Plt, UT | 14 mi | Apr 19 | Oct 19 |
| Sundance, UT | 14 mi | May 17 | Oct 5 |
The average last-frost dates of these stations span 30 days, a rough guide to local variation. See data sources & methods.
Frost questions for 84663
When is the last frost in 84663?
The average (50% chance) last spring freeze of 32°F for ZIP 84663 is April 18. For a more cautious planting date, use May 5, when only 1 year in 10 still sees a later freeze.
When is the first frost in 84663?
The average first fall freeze is October 21. In 1 year in 10 it comes by October 7.
What hardiness zone is 84663?
ZIP 84663 is in USDA zone 6b (-5 to 0°F average coldest winter night), per the 2023 USDA Plant Hardiness Zone Map ZIP listing.
What is the soil temperature in 84663 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
84664 Mapleton 84606 Provo 84602 Provo 84604 Provo 84660 Spanish Fork 84601 Provo 84082 Wallsburg 84097 Orem
Other ZIP codes in Utah County
84003 84004 84005 84013 84042 84043 84045 84057 84058 84059 84062 84097 84601 84602 84604 84606 84626 84633 84651 84653 84655 84660 84664 All Utah County frost dates · Utah frost dates
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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.