Frost Dates for Smithfield, UT 84335
Last spring frost May 22 · First fall frost September 27 · 128 frost-free days · USDA Zone 6a
ZIP 84335 has about 16,200 people.
Moderate season: 128 frost-free days. Spring frost risk spans May 2–June 10 (39 days). Fall frost risk spans September 15–October 9 (24 days).
Frost probability for 84335
| Frost | 10% | 50% | 90% |
|---|---|---|---|
| Spring (last frost) | June 10 | May 22 | May 2 |
| Fall (first frost) | September 15 | September 27 | October 9 |
Dates come from NOAA 1971–2000 freeze probabilities at RICHMOND (10.4 km away); the 50% date is the median year.
Which crops fit a 128-day season in Smithfield
In Smithfield (128 frost-free days, a moderate season), 37 of 56 planner crops fit outright, 16 get two plantings, 2 need an indoor start, 1 crop is perennial.
| Crop | Start indoors | Plant out / sow | Days you have | Verdict | Last sow date |
|---|---|---|---|---|---|
| Tomato | Apr 17 | Jun 5–Jun 12 | 86 | fits: 80 days to maturity, 86 available after Jun 5. | — |
| Pepper | Apr 10 | Jun 5–Jun 12 | 86 | fits: 75 days to maturity, 86 available after Jun 5. | — |
| Lettuce | Mar 27 | Apr 24–May 1 | 163 | two-plantings: Plant Apr 24 and again by Aug 6; both mature before Oct 4. | Aug 6 |
| Carrots | — | May 1–May 8 | 170 | fits: 70 days to maturity, 170 available after May 1. | Jul 26 |
| Cucumber | May 1 | Jun 5–Jun 12 | 100 | fits: 60 days to maturity, 100 available after Jun 5. | Jul 1 |
| Beans | — | May 29–Jun 12 | 114 | fits: 60 days to maturity, 114 available after May 29. | Jul 8 |
| Peas | — | Mar 27–Jun 5 | 191 | fits: 65 days to maturity, 191 available after Mar 27. | Jul 17 |
| Zucchini | May 8 | Jun 5–Jun 12 | 100 | fits: 55 days to maturity, 100 available after Jun 5. | Jul 6 |
| Onion | Feb 27 | Apr 24–May 8 | 163 | fits: 100 days to maturity, 163 available after Apr 24. | — |
| Spinach | — | Mar 27–May 15 | 205 | two-plantings: Plant Mar 27 and again by Aug 25; both mature before Oct 18. | Aug 25 |
| Kale | Mar 13 | Apr 24–May 8 | 177 | two-plantings: Plant Apr 24 and again by Aug 10; both mature before Oct 18. | Aug 10 |
| Broccoli | Mar 27 | Apr 24–May 8 | 163 | fits: 80 days to maturity, 163 available after Apr 24. | Jul 2 |
| Cabbage | Mar 27 | Apr 24–May 8 | 177 | fits: 70 days to maturity, 177 available after Apr 24. | Jul 26 |
| Radish | — | Mar 27–Jun 19 | 191 | two-plantings: Plant Mar 27 and again by Aug 26; both mature before Oct 4. | Aug 26 |
| Beets | — | Mar 27–Jun 19 | 191 | two-plantings: Plant Mar 27 and again by Jul 27; both mature before Oct 4. | Jul 27 |
| Potatoes | — | May 8–May 15 | 149 | fits: 90 days to maturity, 149 available after May 8. | — |
| Garlic | — | Sep 27 | 233 | overwinter: Plant Sep 27 to Oct 18; harvest the following summer. | Oct 18 |
| Strawberry | — | Apr 17–Jun 12 | 184 | perennial: A perennial: plant Apr 17; it fruits from the following year and keeps producing for several years. | — |
| Corn | Apr 24 | May 29–Jun 5 | 100 | fits: 75 days to maturity, 100 available after May 29. | Jun 9 |
| Pumpkin | May 8 | Jun 5–Jun 5 | 93 | head-start: Even planted out Jun 5, the outdoor season is about 7 days short; choose an early variety or grow under cover. | — |
| Cauliflower | Apr 10 | May 15–May 29 | 142 | fits: 75 days to maturity, 142 available after May 15. | Jul 7 |
| Swiss Chard | Mar 27 | May 8–May 8 | 149 | two-plantings: Plant May 8 and again by Jul 27; both mature before Oct 4. | Jul 27 |
| Arugula | — | Mar 27–Jun 19 | 205 | two-plantings: Plant Mar 27 and again by Aug 25; both mature before Oct 18. | Aug 25 |
| Brussel Sprouts | Mar 27 | Apr 24–May 8 | 177 | fits: 100 days to maturity, 177 available after Apr 24. | Jun 26 |
| Butternut Squash | May 8 | Jun 5–Jun 12 | 93 | head-start: Even planted out Jun 5, the outdoor season is about 7 days short; choose an early variety or grow under cover. | — |
| Eggplant | Apr 3 | Jun 5–Jun 12 | 86 | fits: 70 days to maturity, 86 available after Jun 5. | Jun 7 |
| Okra | Apr 24 | May 29–Jun 5 | 107 | fits: 55 days to maturity, 107 available after May 29. | Jul 6 |
| Basil | Apr 17 | Jun 12–Jun 12 | 93 | fits: 60 days to maturity, 93 available after Jun 12. | Jul 1 |
| Cilantro | — | Apr 24–May 15 | 163 | two-plantings: Plant Apr 24 and again by Aug 1; both mature before Oct 4. | Aug 1 |
| Parsley | Mar 13 | May 29–Jun 5 | 128 | fits: 70 days to maturity, 128 available after May 29. | Jul 12 |
| Celery | Mar 13 | May 29–Jun 12 | 128 | fits: 120 days to maturity, 128 available after May 29. | — |
| Scallions | Mar 13 | Apr 24–May 8 | 177 | two-plantings: Plant Apr 24 and again by Aug 5; both mature before Oct 18. | Aug 5 |
| Turnip | — | Apr 24–May 8 | 177 | two-plantings: Plant Apr 24 and again by Aug 15; both mature before Oct 18. | Aug 15 |
| Kohlrabi | — | Apr 10–Apr 24 | 191 | two-plantings: Plant Apr 10 and again by Aug 10; both mature before Oct 18. | Aug 10 |
| Bok Choy | Apr 24 | May 15–May 22 | 142 | two-plantings: Plant May 15 and again by Aug 6; both mature before Oct 4. | Aug 6 |
| Collards | Mar 13 | Apr 24–May 8 | 177 | two-plantings: Plant Apr 24 and again by Aug 5; both mature before Oct 18. | Aug 5 |
| Cantaloupe | May 8 | Jun 5–Jun 12 | 86 | fits: 85 days to maturity, 86 available after Jun 5. | — |
| Chives | Feb 27 | May 29–Jun 5 | 142 | fits: 90 days to maturity, 142 available after May 29. | — |
| Dill | — | Mar 27–Jun 19 | 191 | two-plantings: Plant Mar 27 and again by Jul 27; both mature before Oct 4. | Jul 27 |
| Oregano | Mar 13 | May 29–Jun 5 | 142 | fits: 80 days to maturity, 142 available after May 29. | — |
| Rosemary | Feb 27 | May 29–Jun 5 | 128 | fits: 80 days to maturity, 128 available after May 29. | — |
| Sage | Mar 27 | May 29–Jun 5 | 142 | fits: 75 days to maturity, 142 available after May 29. | — |
| Thyme | Mar 13 | May 29–Jun 5 | 142 | fits: 90 days to maturity, 142 available after May 29. | — |
| Calendula | Apr 10 | May 8–May 22 | 149 | two-plantings: Plant May 8 and again by Aug 1; both mature before Oct 4. | Aug 1 |
| Cosmos | Apr 24 | May 22–Jun 5 | 114 | fits: 60 days to maturity, 114 available after May 22. | Jul 1 |
| Lavender | Feb 27 | May 22–Jun 5 | 149 | fits: 90 days to maturity, 149 available after May 22. | — |
| Marigolds | Apr 10 | May 22–May 29 | 114 | two-plantings: Plant May 22 and again by Jul 11; both mature before Sep 13. | Jul 11 |
| Melons | May 8 | Jun 5–Jun 12 | 86 | fits: 85 days to maturity, 86 available after Jun 5. | — |
| Mint | — | May 22–Jun 5 | 149 | fits: 90 days to maturity, 149 available after May 22. | — |
| Nasturtiums | Apr 24 | May 22–May 29 | 114 | fits: 55 days to maturity, 114 available after May 22. | Jul 6 |
| Pole Beans | — | May 29–Jun 12 | 107 | fits: 65 days to maturity, 107 available after May 29. | Jun 26 |
| Spaghetti Squash | May 8 | Jun 5–Jun 12 | 93 | fits: 90 days to maturity, 93 available after Jun 5. | — |
| Sunflowers | — | May 22–Jun 5 | 114 | fits: 70 days to maturity, 114 available after May 22. | Jun 21 |
| Tomatillos | Mar 27 | May 29–Jun 5 | 93 | fits: 75 days to maturity, 93 available after May 29. | Jun 2 |
| Watermelon | May 8 | May 29–Jun 5 | 93 | fits: 80 days to maturity, 93 available after May 29. | — |
| Yellow Squash | May 8 | Jun 5–Jun 12 | 100 | fits: 55 days to maturity, 100 available after Jun 5. | Jul 6 |
| Zinnias | Apr 24 | May 22–Jun 5 | 114 | fits: 60 days to maturity, 114 available after May 22. | Jul 1 |
Month by month in Smithfield
| Month | What to do |
|---|---|
| January | Plan your garden layout and order seeds. Research varieties suited to your frost dates. |
| February | Start indoors: Chives (Feb 27), Lavender (Feb 27), Onion (Feb 27), Rosemary (Feb 27). |
| March | Start indoors: Celery (Mar 13), Collards (Mar 13), Kale (Mar 13), Oregano (Mar 13), Parsley (Mar 13), Scallions (Mar 13), +8 more. Direct sow from: Arugula (Mar 27), Beets (Mar 27), Dill (Mar 27), Peas (Mar 27), Radish (Mar 27), Spinach (Mar 27). |
| April | Start indoors: Eggplant (Apr 3), Calendula (Apr 10), Cauliflower (Apr 10), Marigolds (Apr 10), Pepper (Apr 10), Basil (Apr 17), +7 more. Direct sow from: Kohlrabi (Apr 10), Cilantro (Apr 24), Turnip (Apr 24). Transplant from: Broccoli (Apr 24), Brussel Sprouts (Apr 24), Cabbage (Apr 24), Collards (Apr 24), Kale (Apr 24), Lettuce (Apr 24), +2 more. Plant: Strawberry (Apr 17). |
| May | Start indoors: Cucumber (May 1), Butternut Squash (May 8), Cantaloupe (May 8), Melons (May 8), Pumpkin (May 8), Spaghetti Squash (May 8), +3 more. Direct sow from: Carrots (May 1), Potatoes (May 8), Sunflowers (May 22), Beans (May 29), Pole Beans (May 29). Transplant from: Calendula (May 8), Swiss Chard (May 8), Bok Choy (May 15), Cauliflower (May 15), Cosmos (May 22), Lavender (May 22), +15 more. Last frost around May 22. |
| June | Transplant from: Butternut Squash (Jun 5), Cantaloupe (Jun 5), Cucumber (Jun 5), Eggplant (Jun 5), Melons (Jun 5), Pepper (Jun 5), +6 more. Last sowing dates: Tomatillos (Jun 2), Eggplant (Jun 7), Corn (Jun 9), Sunflowers (Jun 21), Brussel Sprouts (Jun 26), Pole Beans (Jun 26). |
| July | Last sowing dates: Basil (Jul 1), Cosmos (Jul 1), Cucumber (Jul 1), Zinnias (Jul 1), Broccoli (Jul 2), Nasturtiums (Jul 6), +13 more. |
| August | Last sowing dates: Calendula (Aug 1), Cilantro (Aug 1), Collards (Aug 5), Scallions (Aug 5), Bok Choy (Aug 6), Lettuce (Aug 6), +6 more. |
| September | Direct sow from: Garlic (Sep 27). First frost around September 27. |
| October | Last sowing dates: Garlic (Oct 18). |
| November | Clean up spent plants. Add compost to beds. Rest, review, and plan next year's garden. |
| December | Clean up spent plants. Add compost to beds. Rest, review, and plan next year's garden. |
Frequently Asked Questions
What is the last frost date for Smithfield, UT (ZIP 84335)?
The median last spring frost date for Smithfield, UT (ZIP code 84335) is around May 22. This is the 50th-percentile date — meaning half of all years see frost end before this date. Use the 10% and 90% dates to understand the full range of risk in your area. One year in ten frost ends before May 2; one in ten it runs past June 10.
What is the first fall frost date in Smithfield, UT?
The median first fall frost date for Smithfield, UT is around September 27. Plan to harvest or protect frost-sensitive crops like tomatoes and peppers at least a week before this date to avoid losses. The first frost arrives around September 15 in the earliest one-in-ten years, so cover tomatoes and peppers from then.
How long is the growing season in Smithfield, UT?
The frost-free growing season in Smithfield is about 128 days. This window — from your last spring frost to your first fall frost — is when warm-season vegetables thrive. Cold-hardy crops like kale, spinach, and peas can extend your season by weeks on either side. In Smithfield (128 frost-free days, a moderate season), 37 of 56 planner crops fit outright, 16 get two plantings, 2 need an indoor start, 1 crop is perennial.
What USDA hardiness zone is Smithfield, UT?
Smithfield, UT is in USDA hardiness zone 6a (2023 USDA Plant Hardiness Zone Map). Zones come from the average coldest winter temperature, so they tell you which perennials survive the winter; the frost dates on this page tell you when to plant.
When should I start tomatoes indoors in Smithfield, UT?
Start tomatoes indoors Apr 17 and plant out Jun 5 in Smithfield. The planner uses the local median last frost and this crop's indoor-start and transplant offsets.
How many plantings of lettuce fit in Smithfield?
Two: plant Apr 24 and again by Aug 6; both mature before Oct 4.
When do I plant garlic in Smithfield?
Sep 27 to Oct 18; it overwinters and is ready the following summer.
Can I grow Butternut Squash in Smithfield?
Yes, with help. Even planted out Jun 5, the outdoor season is about 7 days short; choose an early variety or grow under cover.
Which nearby ZIP has a longer season?
Logan (ZIP 84321) has 138 frost-free days, 10 more than Smithfield (ZIP 84335). See Logan ZIP 84321 frost dates
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