Fall in zone 4bPhoto: Dietmar Rabich, CC BY-SA 4.0, via Wikimedia Commons
Frost dates for ZIP 80434 (Jackson County, CO)
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, Centennial 1NE, WY (30 miles away).
Station is a bit far
The nearest station with freeze normals is over 40 km away, so dates here may be off by a week or more.
- Average last spring frostJun 250% chance of a 32°F freeze after this date
- Average first fall frostSep 1950% chance of a 32°F freeze by this date
- Growing season (frost-free)106 daysmedian, 32°F threshold
- USDA hardiness zone4b-25 to -20°F avg. coldest night
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Frost and freeze alerts from the NWS forecast for 80434, the spring soil-temperature heads-up for pre-emergent, and a short weekly yard-timing email.
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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
No soil station with a fresh reading within 62 miles.
4-inch depth
No soil station with a fresh reading within 62 miles.
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 80434 load here. You can also open the NWS forecast for this ZIP.
Pre-emergent
No soil reading near this ZIP. Typical extension timing for your region: spring 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) | May 22 |
| 50% (the "average" last frost) | Jun 2 |
| 10% (cautious: only 1 year in 10 freezes later) | Jun 20 |
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) | Sep 3 |
| 50% (the "average" first frost) | Sep 19 |
| 90% (late: most years have frozen by now) | Oct 2 |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | n/a | n/a |
| 32°F (freeze) | Jun 2 | Sep 19 |
| 28°F (hard freeze) | May 23 | Sep 29 |
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 80434
Dates count from your average last spring frost (Jun 2) and first fall frost (Sep 19). 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 | Apr 7–21 | Jun 9–23 (transplant) | – |
| Pepper (sweet and hot) | Mar 24–Apr 7 | Jun 16–30 (transplant) | – |
| Eggplant | Mar 24–Apr 7 | Jun 16–30 (transplant) | – |
| Tomatillo | Apr 7–21 | Jun 9–23 (transplant) | – |
| Lettuce | Apr 7–21 | May 12–Jun 2 (transplant) May 5–Jun 16 (sow outdoors) | Jul 25–Aug 15 (transplant) Jul 11–Aug 8 (sowing) |
| Spinach | – | Apr 21–May 12 (sow outdoors) | Jul 25–Aug 15 (sowing) |
| Kale | Apr 7–21 | May 5–19 (transplant) May 5–19 (sow outdoors) | Jun 27–Jul 25 (transplant) Jun 13–Jul 11 (sowing) |
| Collards | Apr 7–21 | May 5–Jun 2 (transplant) May 5–Jun 2 (sow outdoors) | Jun 27–Jul 25 (transplant) Jun 13–Jul 11 (sowing) |
| Broccoli | Mar 24–Apr 7 | May 5–19 (transplant) | Jun 13–Jul 11 (transplant) |
| Cabbage | Mar 24–Apr 7 | May 5–19 (transplant) | Jun 13–Jul 11 (transplant) |
| Cauliflower | Mar 24–Apr 7 | May 19–Jun 2 (transplant) | Jun 13–Jul 11 (transplant) |
| Brussels sprouts | Mar 10–24 | May 5–19 (transplant) | May 30–Jun 20 (transplant) |
| Kohlrabi | Apr 7–21 | May 5–19 (transplant) May 5–19 (sow outdoors) | Jul 11–25 (sowing) |
| Bok choy / Asian greens | – | May 5–19 (sow outdoors) | Jul 25–Aug 8 (sowing) |
| Arugula | – | May 5–Jun 2 (sow outdoors) | Jul 25–Aug 22 (sowing) |
| Mustard greens | – | May 5–26 (sow outdoors) | Jul 25–Aug 8 (sowing) |
| Swiss chard | Apr 21–May 5 | May 19–Jun 9 (transplant) May 19–Jun 16 (sow outdoors) | Jul 11–25 (sowing) |
| Beet | – | May 5–Jun 2 (sow outdoors) | Jul 11–25 (sowing) |
| Carrot | – | May 12–Jun 9 (sow outdoors) | Jun 27–Jul 11 (sowing) |
| Radish | – | Apr 28–Jun 9 (sow outdoors) | Aug 8–22 (sowing) |
| Turnip | – | May 5–26 (sow outdoors) | Jul 11–25 (sowing) |
| Parsnip | – | May 12–Jun 2 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Apr 7–May 5 (sow outdoors) | Jun 27–Jul 11 (sowing) |
| Onion (bulbing) | Mar 10–24 | Apr 21–May 5 (transplant) | – |
| Green onion / scallion | – | Apr 21–May 19 (sow outdoors) | Jul 11–25 (sowing) |
| Leek | Mar 10–24 | May 5–19 (transplant) | – |
| Garlic | – | – | Aug 8–Sep 5 (sowing) |
| Shallot | – | Apr 21–May 5 (transplant) | Aug 8–Sep 5 (sowing) |
| Potato | – | May 5–19 (transplant) | May 30–Jun 13 (transplant) |
| Sweet potato | – | Jun 23–Jul 7 (transplant) | – |
| Sweet corn | – | Jun 9–23 (sow outdoors) | – |
| Bean, bush (snap) | – | Jun 9–23 (sow outdoors) | – |
| Bean, pole | – | Jun 9–23 (sow outdoors) | – |
| Lima bean | – | Jun 16–30 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | Jun 23–Jul 14 (sow outdoors) | – |
| Cucumber | May 5–12 | Jun 9–23 (transplant) Jun 9–23 (sow outdoors) | – |
| Summer squash / zucchini | May 5–12 | Jun 9–23 (transplant) Jun 9–23 (sow outdoors) | – |
| Winter squash | May 5–12 | Jun 9–23 (transplant) Jun 9–23 (sow outdoors) | – |
| Pumpkin | – | Jun 9–23 (sow outdoors) | – |
| Watermelon | May 5–12 | Jun 16–30 (transplant) Jun 16–30 (sow outdoors) | – |
| Cantaloupe / muskmelon | May 5–12 | Jun 16–30 (transplant) Jun 16–30 (sow outdoors) | – |
| Okra | Apr 21–May 5 | Jun 16–30 (transplant) Jun 16–30 (sow outdoors) | – |
| Celery | Mar 10–24 | Jun 9–16 (transplant) | – |
| Basil | Apr 21–May 5 | Jun 9–23 (transplant) Jun 9–23 (sow outdoors) | – |
| Cilantro | – | May 19–Jun 16 (sow outdoors) | Jul 25–Aug 8 (sowing) |
| Parsley | Mar 24–Apr 7 | May 19–Jun 2 (transplant) May 12–Jun 2 (sow outdoors) | – |
| Dill | – | Jun 2–16 (sow outdoors) | Jul 25–Aug 8 (sowing) |
| Sunflower | – | Jun 2–16 (sow outdoors) | – |
| Asparagus (crowns) | – | May 5–19 (transplant) | – |
| Rhubarb (crowns) | – | May 5–19 (transplant) | – |
| Strawberry (plants) | – | May 5–19 (transplant) | Jul 11–Aug 8 (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.
Plants that do well here
Colorado has a university or garden plant program: Plant Select®. Plant frost-tender annuals after June 2 here (the average last frost). Not affiliated with the program.
Where these numbers come from
Station: Centennial 1NE, WY (NOAA GHCN-Daily ID USC00481610), elevation 8,170 ft, 29.5 miles from the ZIP's center point. NOAA completeness flag: R (representative, 10+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Rustic 9WSW, CO | 33 mi | Jun 5 | Sep 16 |
| Steamboat Springs, CO | 40 mi | Jun 9 | Sep 12 |
| Laramie Rgnl AP, WY | 43 mi | Jun 2 | Sep 15 |
The average last-frost dates of these stations span 7 days, a rough guide to local variation. See data sources & methods.
Frost questions for 80434
When is the last frost in 80434?
The average (50% chance) last spring freeze of 32°F for ZIP 80434 is June 2. For a more cautious planting date, use June 20, when only 1 year in 10 still sees a later freeze.
When is the first frost in 80434?
The average first fall freeze is September 19. In 1 year in 10 it comes by September 3.
What hardiness zone is 80434?
ZIP 80434 is in USDA zone 4b (-25 to -20°F average coldest winter night), per the 2023 USDA Plant Hardiness Zone Map ZIP listing.
What is the soil temperature in 80434 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
80480 Walden 82063 80430 80545 Red Feather Lakes 82325 Encampment 82070 Laramie 80473 82055 Centennial
Other ZIP codes in Jackson County
80430 80473 80480 All Jackson County frost dates · Colorado frost dates
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Weekly yard timing, plus frost and soil-temperature alerts for your ZIP code.
- Freeze alerts
- Soil-temp heads-up
- Weekly yard to-dos
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.